Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7ade052b52fe994…

MALICIOUS

PDF

71.9 KB Created: 2021-09-16 16:55:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ce05b97957e880d73c6f5ba230c5f8b9 SHA-1: 34552a5ed10ea797582e68deaaee949d2bdd1c41 SHA-256: d7ade052b52fe9945bb92379b96dbe8baa43050f7f7d89cfd3da16368ef67f52
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains numerous links pointing to compromised websites, suggesting a phishing or malware distribution scheme. The presence of link farms on disposable hosting and compromised CMS upload storage further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://polytex.de/sites/default/files/55658752874.pdf In PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/973f4ce50f786f6369633c83e9aa53fc/41263281404.pdfIn PDF document text
    • http://0225674989.kad.tw/kads/ckfinder/userfiles/files/lojuja.pdfIn PDF document text
    • https://emotionalgift.com/ckfinder/userfiles/files/96378519235.pdfIn PDF document text
    • http://pxmonastery.org/CKEdit/upload/files/90813509586.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/6dcec44886acdc9d916a54379ea10a72/65478665990.pdfIn PDF document text
    • http://skkl.cn/filespath/files/20210914055403.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140dafe1214b---pokonaxusixulolugepawoki.pdfIn PDF document text
    • http://polaryachts.com/res/wysiwyg/file/27539143319.pdfIn PDF document text
    • https://menu2uplus.com/images/file/85964120752.pdfIn PDF document text
    • http://balmybnb.com/t/tutorfirm/uploads/ck/files/27168251478.pdfIn PDF document text
    • http://cmorshomecareassociates.org/uploaded_files/userfiles/files/98117705631.pdfIn PDF document text
    • http://paramountswimwear.com/userfiles/files/35880633474.pdfIn PDF document text
    • https://gizaviation.com/uploads/files/guzimovawedirogimusirotev.pdfIn PDF document text
    • http://needychild.org/ckfinder/userfiles/files/xezesovulovisitirigotevo.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/pixagasozurowedikovowub.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613163bb18623---881447662.pdfIn PDF document text
    • https://leanuslab.com/UserFiles/file/difuredoduzakurukojesot.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137a7b1d5515---xugutizanugutejididuf.pdfIn PDF document text
    • http://portakalweb.net/home/portakal/public_html/ckfinder/userfiles/files/kanafobosipibogip.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/h8go5kc6o2l4qav7pd6gck79m4/zovosorowa.pdfIn PDF document text
    • https://skykharchono.mn/editor/files/wegizivexido.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/7eb146a9dada1051c82723d25975a8e4/43796102899.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=my+beef+with+meat+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_off0000b68a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB68A 16872 bytes
SHA-256: 1789ac715f2bac1529d1b24fcfafacb02d40749efff023dd205c346fc27f060e
font_01_sfnt_off0000e233.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE233 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fa4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA4A 10556 bytes
SHA-256: 17babdcd0898cd1d278f82b0565117a86a45de2281840089b813c6a08b388df3

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