Malicious PDF — malware analysis report

Static analysis result for SHA-256 e37b3404f9c50d66…

MALICIOUS

PDF

101.4 KB Created: 2021-09-05 23:16:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 258bbf7da7cd85bc930599f20b3e1ae2 SHA-1: b57c3674592fd6dbb1248e4da77c880a9678585d SHA-256: e37b3404f9c50d66258564b1b4e19bf55301955de4292bb67dd463edac117007
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to other PDFs hosted on compromised websites. The primary goal appears to be directing users to malicious content, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/d52d4572e261e9af23d7e6570778c63a/jotatenejefefo.pdf In PDF document text
    • http://drironcat.com/images/file/zasafekibof.pdfIn PDF document text
    • http://granite1962.com/clients/869125/File/12148246253.pdfIn PDF document text
    • http://interel-rus.ru/test/sites/default/files/file/22374279916.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/494886fdacbfa40abcf75e83d4c3128e/rajarej.pdfIn PDF document text
    • http://berbun.com/user_img/file/23821976180.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/24858f2b1979168656d0b81a1f3e088c/25760263775.pdfIn PDF document text
    • http://protok.pro/upload/files/viridijezowogabalep.pdfIn PDF document text
    • http://lumieretvie.com/userfiles/file/rapedowobawa.pdfIn PDF document text
    • https://chezgregoire.fr/userfiles/kodip.pdfIn PDF document text
    • http://svatba-emi.com/uploads/pages/files/74814606167.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1610e8e1d9b3b3---sozibikudapo.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/3f2f6d6525ec960685c494a46e48948e/82564645165.pdfIn PDF document text
    • http://blesk-stroy.ru/userfiles/files/93492860779.pdfIn PDF document text
    • https://alixdemassy.fr/userfiles/file/zefiwodibar.pdfIn PDF document text
    • http://kalmi.ru/upfiles/files/39269971715.pdfIn PDF document text
    • http://rwdwebwebdesign.com/img-aim/files/62570895175.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/1594873d212d146b607a3079de67e600/46398694684.pdfIn PDF document text
    • https://burgaseguros.com/userfiles/file/89804775978.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608c86d7c10ed---vokunowovunipuvofola.pdfIn PDF document text
    • http://realfootball.gr/userfiles/file/sazigozasufetopujasirune.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0123b35b4c---44908060710.pdfIn PDF document text
    • http://ivepe-elearning.gr/assets/UserFiles/mainHome/file/71873749462.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608334c88db26---zedulatezojiwemikol.pdfIn PDF document text
    • https://bonekarusa.com/contents/files/dopagibikokadokufuros.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=le+lexique+des+termes+juridiques+dalloz+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • 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
font_00_sfnt_off00011df8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DF8 22084 bytes
SHA-256: 561f1d16ef1b3f0b3e53d5e2cc4e87eb39a75fe2c2c2e0a415f0acb9c1dd5c16
font_01_sfnt_off00015561.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15561 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016d78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16D78 11052 bytes
SHA-256: 3f36b15575fc4d894202393cd219df5e75bf4d8dd03183fa7f43c25763ce8e3c