Malicious PDF — malware analysis report

Static analysis result for SHA-256 1309a3080449b030…

MALICIOUS

PDF

108.4 KB Created: 2021-06-25 23:08:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ac6b638e7badf44e812cb6594b207dfb SHA-1: dbc4567206e75e2d2418b61292e6e5290eb5569f SHA-256: 1309a3080449b030b607abc1c087268c19bfaceaef2827f810d4987e6650112d
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm. Multiple URLs point to compromised WordPress sites, suggesting a phishing or malware distribution scheme. The PDF structure and embedded links are designed to lure users to external, potentially malicious, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9931

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 http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609a3d62878c6---kejuli.pdf
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/688cd41144c74e716fb1295c49d8c5b0/firilitiket.pdf
    • http://www.annaleehuber.com/content_files/file/50217832003.pdf
    • https://dewalt-naradi.cz/media/upload/editor/file/23974593786.pdf
    • http://chalappuram.com/userfiles/file/tivizivituxavizawi.pdf
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/t9t55j1n3pccsmp16em6kjqn3e/14000895427.pdf
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16087f8e4075fd---visedozuzanifapefas.pdf
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c531be8b7fd---kifevotibeparakevafeke.pdf
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d2cb7ce85c3---dozejodenosap.pdf
    • http://cl-metalparts.com/d/files/madawubuxagaferakefubarin.pdf
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ac48430236f---tabijiwedibapiwudemap.pdf
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160c4d05e8ba23---nesogevotudize.pdf
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8f4013f0bf475537c64dcc74de63891f/37741558812.pdf
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/843294343d96a523f6c622d58bd7b4ce/tujupik.pdf
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/2bc8e0fedc3662590f16448d4364229a/98727903822.pdf
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160748c32aa06d---28372032479.pdf
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/96c3ae9fedfa2d26fbcc8db7408ea52a/jogidir.pdf
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/832ple4032d4r4vf919eum2gv4/92135131878.pdf
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f17563205f---dadosex.pdf
    • http://tourister.kr/userfiles/file/tikejotipix.pdf
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/160b5e54186b52---fojuvolumonefizefa.pdf
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b9a1667eee---14658506674.pdf
    • http://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/4cbeeb71b6a3615b6008c1ccbdbbfcb4/jogusorarifaremugobu.pdf
    • http://groupkaishan.com/d/files/guneje.pdf
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4b9fdd60e3---wubexamafep.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=point+of+view+worksheet+14
    • 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_off00014629.bin
d235a21b67d24b0ff7717d9284d1eb036dacc8c86fcaeb3aee48da497e38e857		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14629 10476 bytes
font_01_sfnt_off00015e0d.bin
ccf416dac6360ced0de2186a0c546c45d9e40aee58d2c6b73443529fd902efc0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15E0D 17516 bytes
font_02_sfnt_off00018c1e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x18C1E 16792 bytes

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