Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bec1b202e243118…

MALICIOUS

PDF

86.7 KB Created: 2021-08-12 23:24:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8cbaa17d337aca0acd6917ff9a1b8557 SHA-1: de46a1c82864f699a87345cbfecb9e34ff24eeec SHA-256: 4bec1b202e243118e78faaacf7cf42bfe0433bfeddbc96c4ff17ec1fbd1afc02
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a large number of embedded URLs, many of which point to compromised WordPress sites. The ClamAV detection and ML classifier strongly indicate maliciousness, classifying it as a phishing trojan. The primary attack pattern involves luring users to these compromised sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/c27c3b3fa9b19dd0b39ed3a6c7d1352b/18817003918.pdf In PDF document text
    • https://aartipalette.com/userfiles/file/xusudamuwenavoneripagux.pdfIn PDF document text
    • https://faktxeber.com/resimler/files/bexodolofusolonawogalu.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088541787731---67329526725.pdfIn PDF document text
    • http://mcutech.net/files/52780134088.pdfIn PDF document text
    • http://technoculture.cz/admin/upload/file/79022680768.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/705fuddrg0nh28n2o437jmr5im/53312724478.pdfIn PDF document text
    • https://digidatadecolombia.com/wp-content/plugins/super-forms/uploads/php/files/6e6897291574b59ce6d51fd1f455745f/60715978906.pdfIn PDF document text
    • http://asupuro.com/upload/save_image/files/28654910272.pdfIn PDF document text
    • http://adhdesign.de/userContent/files/20210607224449-6027480617.pdfIn PDF document text
    • http://billsky.ee/files/file/87129273215.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acbc8106c63---23785954424.pdfIn PDF document text
    • https://drinkpoint.com/uploads/files/32595925695.pdfIn PDF document text
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/cccff9bb256d008ebb3ee308c654448a/86806015198.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/49cb46216263a86fe79b6f870e0ef8af/22395532137.pdfIn PDF document text
    • http://ssaisarang.com/ckfinder/userfiles/files/51363818640.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/11325101886.pdfIn PDF document text
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/1d8fd2729ac07be3770b76eadb6bf64f/6043066171.pdfIn PDF document text
    • http://gesundimjob.at/images/content/files/xevofo.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/35875205216.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160b987eae361f---97819404327.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/0e0b864d1a43fb945e9ecbad419c3387/79378396335.pdfIn PDF document text
    • http://momsystem.ru/public/file/vokuna.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=gta+5+for+android+apk+%2B+obbPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF73 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010785.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10785 17340 bytes
SHA-256: 9a6cc6e06bbdd484b138073925889cedcf2b2635292fc007b83a33b47f597f4a
font_02_sfnt_off000134f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134F8 10548 bytes
SHA-256: f81402c2ebaaab93158a3824a21cfa40cf7f55f06a4f466dd2b47abc301ee355

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