Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ef40da8cdc82f82…

MALICIOUS

PDF

105.4 KB Created: 2021-07-30 12:05:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 92ef2251563b6b464039ba12a17b244d SHA-1: b2d082f112f2b2d2d12bdd58aecd8c7c351ae272 SHA-256: 8ef40da8cdc82f82e1ab65c0abdf38b2e871b8cd393d05dfc5632a9809fadaaa
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV with a 'Pdf.Phishing.Trojan' signature. Static analysis revealed a link farm structure within the PDF, with numerous URLs pointing to files hosted on compromised CMS uploads and disposable hosting. These links likely serve as a lure to download further malicious content, consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.2704

Heuristics 5

  • 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
  • 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://hajni.pl/userfiles/file/wanevatejevevokanewakog.pdf In PDF document text
    • http://cityhelps.org/clients/6/61/61afa7a028a8e04f14432b0fece6f2b0/File/wenarilob.pdfIn PDF document text
    • http://www.blueoak.fr/image/file/18877903130.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce50cb4fb2---99365587200.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/16092472adbf9e---xoxowufosifirukek.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/7f7a69ca0eef72297ddee15ff11e42e9/diditoxumupolur.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c740c71b641---gadevefaret.pdfIn PDF document text
    • https://skyzoan.com/cake/beta/userfiles/file/ralavexelufivesebajasiv.pdfIn PDF document text
    • http://c2ctrading.org/cms_upload/files/kifinegutusil.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099cc733e6f3---32618573160.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7b30c8e302---89147139620.pdfIn PDF document text
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/60cf6a9ba8dfaed3bf88c2ffb9721f6e/damakejanaxutugemad.pdfIn PDF document text
    • https://realestateconnect.us/wp-content/plugins/super-forms/uploads/php/files/ru8jkh05kmm4el16kbhvo2uc51/fasuwarizegorivorutafod.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160948263a232f---soxexeletereloboj.pdfIn PDF document text
    • http://unicorn-furnitures.com/d/files/jakojimus.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/675c78c4881970fbcb017408bfb7c8e1/25448812652.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/51aaf35a365c5805ad2c17d8f0a669af/solidenorebozi.pdfIn PDF document text
    • http://outspokenholland.com/userfiles/fckFile/20210601125951.pdfIn PDF document text
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085ea82ab1c5---tixemosawedofir.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1320ae5a54---82142477500.pdfIn PDF document text
    • http://tiwtactic.com/userfiles/files/96881332861.pdfIn PDF document text
    • http://gmei.lt/ckfinder/userfiles/files/teraguwonata.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/0a0e10b47ca16ee930653f33b04d193e/bajuravawego.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160c54c33467e2---wobakimabugumexav.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=best+settings+for+dolphin+emulator+2020PDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00012943.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x12943 21308 bytes
SHA-256: 8b1a0eeaf67522f5bde51a90145235420708876c48f8fe0cd7fe724e8556814b
font_01_sfnt_off00014e42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E42 17480 bytes
SHA-256: 80b4a5d4fbeea501950e4cbf09a9bab3456d9fa0be040b249571a8884f9ccb48
font_02_sfnt_off00017c68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17C68 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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