Malicious PDF — malware analysis report

Static analysis result for SHA-256 91338e27e8999d0b…

MALICIOUS

PDF

94.8 KB Created: 2021-07-02 18:43:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 5013d550a3ee4e0f5651a511cdfea48b SHA-1: f50ab0d9b5b6f69fde27c517e0acd8fc09569305 SHA-256: 91338e27e8999d0bff6edbe54ad8ed9a6cc120e73d0a4dfb06ac0b974f163f46
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of a 'Password-protected archive handoff' heuristic suggests the document is designed to trick users into providing a password for an archive, a common tactic for bypassing gateway security. Numerous links to potentially compromised websites and disposable hosting were extracted, supporting the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9769

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://www.ecvbrass.ch/user/web/file/47274298706.pdf In PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/0a50a7c4ad6b8c49f6c361bdeb874c27/merukiregovosuzobara.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/160b9513428eb2---xapesarejizapuxijok.pdfIn PDF document text
    • http://myphamlulanjina.com/upload/files/77427140987.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/bb828f447f5a15c694fe93158606de4d/vuvufoje.pdfIn PDF document text
    • http://coss-wynn-reunion.com/clients/d/db/dbe3622004495b304d8703879a486b7d/File/53659681106.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa3dc5fd3d---5079053299.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/148e9157a68e474a5342c1789247a343/notibeserisezo.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607efd6121e4b---84981475538.pdfIn PDF document text
    • http://www.tekkoo.net/images/library/File/vidiwejukiwi.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071744e72da7---62380728155.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/82057ff1ed2c86094efaaafe73e80ede/puxekejutowu.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/52791798045.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/72441929528.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16072ac21f08b4---83268431574.pdfIn PDF document text
    • https://jagominum.com/contents//files/wonivuzusaxezebuxatuloz.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/5dceed8ec4aa3de7de15f7d90e94cbe0/vijami.pdfIn PDF document text
    • http://apluskleaning.com/admin/images/file/felepuxojararolenavile.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/vsv0hacf275rv49t8skguok17j/pupif.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b77d741ca7e---84321715535.pdfIn PDF document text
    • http://maasmartcity.com/userfiles/file/7182607907.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/af9k6pgbqgtumm3bf33fsmcs6u/sukebelixerokivuvufewobij.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16084b8ed59770---sipetusoxopup.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608bfd28398f8---73218590494.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607a1b1d43d76---sofoxotugajeni.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/beb0722d17ca2fc9e931767f7548f0d3/80773364610.pdfIn PDF document text
    • http://lesen-und-schenken.de/userfiles/files/11667894773.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=gta+5+mobile+download+highly+compressedPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF16 17400 bytes
SHA-256: 5fd7f61798e7459e6174d1cd3957e1b76f58396f3f1252cf0856ac97a12dbea3
font_01_sfnt_off00010957.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10957 11476 bytes
SHA-256: dc7d8f337412b8680894862bb9374e190932284de07797ff7e199e81e4c89aca
font_02_sfnt_off000123f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00013c0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C0B 18344 bytes
SHA-256: 85d406319a4071a155a4207b8761879178789edc32327c1a188fa1a4467803b7