Malicious PDF — malware analysis report

Static analysis result for SHA-256 833fe0fb4fbf63a0…

MALICIOUS

PDF

158.9 KB Created: 2021-06-17 08:53:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 7be8d5744456b7069435efd71b0dc61f SHA-1: a8d22b907bbde2762e370a4e0b2211fe813e5f22 SHA-256: 833fe0fb4fbf63a0e88c25d6aca9ae41ad2ea9349be1827896255d5d9da40a5e
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://wastran.ru/uplcv?utm_term=attack+on+titan+season+4+ep+2+eng+dub PDF link annotation
    • http://bike-aholic.com/UserFiles/file/rimak.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609383dc448a5---tamumofaseb.pdfIn PDF document text
    • http://bbpcosmetics.com/admin/upFiles/2021-6/file/12602547006.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1608d071b443c2---jegiju.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607b8489b44ac---62508768147.pdfIn PDF document text
    • https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/27g7kqqj520egms0ll8l932etl/49584368221.pdfIn PDF document text
    • https://businessservicesuk.com/userfiles/file/suxuluruva.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/b019366cab70a5683adf9df4746e43e1/8382033492.pdfIn PDF document text
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/5e32e8a06264423f4fe7e0b75703097a/67062082163.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b724c576c3c---jijuselurofozeru.pdfIn PDF document text
    • http://shuswapladystriders.ca/userfiles/file/toxeponogijute.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/26v204eb85beikckt7kgs6kkc2/roguzafemafupiko.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16086094947235---zobipalekub.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b877e56513---jotaxojinosazasovo.pdfIn PDF document text
    • http://smitheaster.org/clients/861344/File/fimijarisupejuwujat.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • 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://scripts.sil.org/OFLIn 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_off000135f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135F9 76200 bytes
SHA-256: 462645feb392588d0fca8b919d9c7a4f6aafd9fd2b80e43aafe890ff3d5b4cd3
font_01_sfnt_off00021b8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21B8B 5528 bytes
SHA-256: e0cb0c991668bf1bd56b4e7ce0fef702d827d12a2d26c0db9b2d858c7ec48f35
font_02_sfnt_off00022e7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22E7D 11424 bytes
SHA-256: dc69c14c9036c19648a109fdea32dc0631753696b4a09768a69aa522cb3f917c
font_03_sfnt_off0002545f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2545F 18404 bytes
SHA-256: ac14895c7f2ecb5f346557e0f4675e8d3a2e8830c4abac1a19a0aa9b9178471a

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