Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8738edb59f9acc1…

MALICIOUS

PDF

88.9 KB Created: 2021-06-27 00:20:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 552a86f0c146422195f004793dffa650 SHA-1: 4aef65e89a017182816cb0a77209e18bd3ef3e46 SHA-256: b8738edb59f9acc1e57fc6491d34d4692eeb12ee0e38be6b5e7a8cb4b79e6431
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, suggesting it functions as a link farm to distribute malicious content. The presence of embedded URLs and the nature of the heuristics strongly suggest an attempt to redirect users to harmful sites, likely as part of a phishing campaign or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • 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 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://archism.ru/uplcv?utm_term=bollywood+free+movies+sites
    • http://brandnewgoods.net/userfiles/file/kukekokigoxonazenulewu.pdf
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/dfcaf36968ba633200e6c8b79ce33237/solomedorubefetezoteduji.pdf
    • http://beijingxinzhi.com/userfiles/file/20210510023638_2067845471.pdf
    • https://www.sudburyhighspeedinternet.ca/wp-content/plugins/super-forms/uploads/php/files/f8415301018eefe2f7f6f6ebd53342db/famuso.pdf
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/be3af3d8883a935b63f081ab868f7c79/podajewugazukejewevu.pdf
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/8666cb8c5c90f363465e5d9ad6219a21/21205994160.pdf
    • https://birudongker.com/contents//files/90463392625.pdf
    • http://sicilalluminio.it/userfiles/files/57343187250.pdf
    • http://charivne.info/images/file/62249484720.pdf
    • http://georgekoldun.com/var/upload/file/20546511403.pdf
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160794d04b5630---62469196197.pdf
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c1a99388dca---92190730037.pdf
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f2d8d8a120---77221955191.pdf
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/ptiatib5fv150bj079nc0uki44/puzepozewubiwusuxuvonivu.pdf
    • http://ferramentabelleggia.it/public/file/78021322180.pdf
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608ca03337ff2---kizez.pdf
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aabbe00665e---97388365083.pdf
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/16075552f65618---39634915042.pdf
    • http://daehwa.info/uploaded/file/89369802033.pdf
    • http://nuestratierrapremios.com/campannas/file/jagerogudelumewigiza.pdf
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/02429fdf20ac0bb7a5ec2493fc78f6cb/85282548151.pdf
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1377445880---89308489148.pdf
    • http://myxroad.com/upload/userfiles/file///pikedexinidedisibulo.pdf
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/fa6cj57rfc4s639gadf54dm132/vixus.pdf
    • http://bvsaigonbinhduong.com/uploads/files/33755906161.pdf
    • 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_off0000f732.bin
38cc411643f31915b97ac1e87d85e3232ebd401d7760381d2a49ea5444085836
pdf-font-stream PDF embedded font (sfnt) at offset 0xF732 10568 bytes
font_01_sfnt_off00010f6a.bin
fca6b7808e8828e55e6aa9683f94e5e560c6643055f268717974fbcb52768c75
pdf-font-stream PDF embedded font (sfnt) at offset 0x10F6A 17352 bytes
font_02_sfnt_off00013cbb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13CBB 16792 bytes