Malicious PDF — malware analysis report

Static analysis result for SHA-256 938e5bb6e2b6fb4e…

MALICIOUS

PDF

85.4 KB Created: 2021-06-28 23:20:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9269a2f33e7f947a0366cba51be4dd5b SHA-1: 9164c6b2135372b047f52663eb5ab5c0e196b87e SHA-256: 938e5bb6e2b6fb4eeff24f426df4f8de46beae3244ca8decdb89bd6537c9c24e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress upload directories, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d8ac28e192a---timifaforefud.pdf
    • https://travolution.travel/wp-content/plugins/super-forms/uploads/php/files/c01bb405bb46e35163a13531a1ec3fb4/64191059561.pdf
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160841797e5f6b---redovezuxipi.pdf
    • http://topimmigrationlawyer.org/ckfinder/userfiles/files/51297242522.pdf
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608445dd75adb---bupiwuwidepupaxe.pdf
    • http://alliusie.com/userfiles/file/xugopovorivaroza.pdf
    • http://omonetach.pl/foto/ilustracje/file/laribosisasizoroxulevuwu.pdf
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/ee69c6d4cae39787bef7d5e682b83310/zokokebukalumuk.pdf
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/su552mfr7fr80sf4thdh3ugpkf/nojone.pdf
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/16079f2249221a---91695996987.pdf
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/2942f7635a9c56925762481cc002f6ae/23026751905.pdf
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/8237826c531f8a569ce1789f36fe4d55/nagazaw.pdf
    • http://collegium-connect.nl/ckupload/files/zeletenitoluwalojedemilox.pdf
    • http://westleyden72reunion.com/clients/4/46/469dc9162705cbff2d1fbe132f144f37/File/45050836733.pdf
    • https://egyiksem.hu/uploads/file/67785019613.pdf
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091ed7a3f37f---43750002384.pdf
    • https://smsenerji.com/resimler/files/71051516995.pdf
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160870c0d77d0a---vafulamowomanuloba.pdf
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/lt8pqrc4i42h4nn1r2b1lau0un/mubusepepifisoru.pdf
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1607ac7d2dca7d---16415490893.pdf
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609d3ca0a453e---24384545258.pdf
    • http://ruishikaishi.com/upload/content/files/2021/06/20210621005042.pdf
    • http://fongyoskert.hu/userfiles/files/82554407318.pdf
    • http://ecole.ru/text/images/file/dexebivumes.pdf
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/c180db740fdee1a01eced059d35c48f3/vevavidokevadiso.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=the+doll%27s+house
    • 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_off0000ed2b.bin
350f1f0a0a6aab0844aef764df53080be4c93210c40ef301dc1fb394c468d5c8
pdf-font-stream PDF embedded font (sfnt) at offset 0xED2B 9884 bytes
font_01_sfnt_off0001031a.bin
744443a401e575ba210e29a02a3e309e6750bc5ab94fe64e2722847b1823125b
pdf-font-stream PDF embedded font (sfnt) at offset 0x1031A 17672 bytes
font_02_sfnt_off000130aa.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x130AA 16792 bytes