Malicious PDF — malware analysis report

Static analysis result for SHA-256 c22b94bf1520c742…

MALICIOUS

PDF

91.6 KB Created: 2021-07-02 10:42:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5fde08fdb040822c5fd43636e4993cda SHA-1: 6c6a60d30d2df4b4332cced479ef30682293b59c SHA-256: c22b94bf1520c742691ac48d93178b6ed0fa60fdb5d8d2c9f4e47e43de7dde5f
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to external websites, many of which are hosted on compromised CMS platforms or appear to be part of a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the presence of numerous suspicious URLs points to a web-based attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • 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 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://activepymes.com/pub/file/87709157761.pdf
    • http://rilta.net/userfiles/files/xuralovepogokedevixojava.pdf
    • https://www.reachcast.ca/wp-content/plugins/super-forms/uploads/php/files/e6628dea319cb8e4b866f08c7aae42eb/lefexijelatolagixinek.pdf
    • http://alphabodysupplements.com/newerac2c/userfiles/file/jinanamo.pdf
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f5ea59f5f8---gefosu.pdf
    • http://uptownfallschurch.com/uploads/files/mapoz.pdf
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/7go7dc531fuloim8ffs33vtunu/dibatofif.pdf
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/6ehnjsmlt506varl93in020g23/wuwuvifanolalododunikob.pdf
    • http://lyzebrno.cz/userfiles/file/79107574866.pdf
    • https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/8gtuovcq8c6vq2i70jodmdmn2r/91717317901.pdf
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/a891252f621dd5ba9c2d5fa5b347f2c5/8195224468.pdf
    • http://fairytaleweddingsandeventsbymary.com/clients/f/f2/f272f95a0afb65faa7304057ec0e56f6/File/71987275811.pdf
    • http://etenindex.nl/images/uploads/36788441652.pdf
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1608321c7eb300---kutorajewegomexazakewage.pdf
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b1cc23fd58---65119552455.pdf
    • http://cgl.lu/userfiles/files/77330576809.pdf
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/j8bh64up7v63st5mr4ia4h7liv/46083026498.pdf
    • http://princeworldwide.com/multimedia/userfiles/file/jarepanakivemawoxegure.pdf
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160758f526a400---30268555552.pdf
    • https://eatorhours.org/e-bussiness/fckimages/file/fanupijogijuf.pdf
    • https://wecareprogram.org/images/file/20617089668.pdf
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076aecab257c---ronimibexiji.pdf
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3a8c5ojmfm5rj8fcsts9u3ee55/73189621928.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=movies+like+the+conjuring+2
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000103a1.bin
fd76f46cd9f05298f47eced3f07f5ce0a1176ee4a8e70795959b9a7ff5c42fed
pdf-font-stream PDF embedded font (sfnt) at offset 0x103A1 17356 bytes
font_01_sfnt_off00013152.bin
5dfe2b1dd35dc155b6b5e1245d697ea5f4546c7b18ea3d93aaef3f28f5d306cf
pdf-font-stream PDF embedded font (sfnt) at offset 0x13152 10848 bytes
font_02_sfnt_off00014a65.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14A65 16792 bytes