Malicious PDF — malware analysis report

Static analysis result for SHA-256 eecc87179375e1ff…

MALICIOUS

PDF

84.8 KB Created: 2021-09-01 01:33:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2ebc16965592d5a78ed72e59f0c4e9b6 SHA-1: d7be7ad4aa6c99881b0df4390031e3d6e96cf6df SHA-256: eecc87179375e1ff223694ef40d7edf0fa95971bc179abefe4de36a4540d0d84
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to potentially compromised websites and disposable hosting, suggesting it's part of a link farm designed to redirect users to malicious content. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports this. No scripts were extracted, but the overall structure points to a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 http://lhsclassof1971.com/clients/74120/File/33530025572.pdf In PDF document text
    • https://www.champagne-auge-dascier.com/ckfinder/userfiles/files/xuwomotajare.pdfIn PDF document text
    • https://texigo.tw/upfile/files/2021/06/24/wafalu.pdfIn PDF document text
    • http://av-jet.ru/userfiles/file/vivurubabesased.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/0f75bf737c91ce65648a6444b899f036/70838978326.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081bc6d9102b---2060806663.pdfIn PDF document text
    • http://dealershop.es/userfiles/file/66613272926.pdfIn PDF document text
    • http://merrygoldholidays.com/ckfinder/userfiles/files/46296954951.pdfIn PDF document text
    • http://bnblspecialities.com/userfiles/files/47231940945.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/160cfc9df9e710---17627804507.pdfIn PDF document text
    • http://studioguidobarbieri.it/userfiles/files/36593616539.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/161158a1d48781---zutufavogemunirezasozoki.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/tsdvce5e902mkp99p50eaaq2f5/87615212113.pdfIn PDF document text
    • https://flexrocksrollovers.com/wp-content/plugins/super-forms/uploads/php/files/g4s6lfksqbeqc9rkuube2stkeu/fisaxumovumaporal.pdfIn PDF document text
    • http://myphamasia.net/upload/files/supipikibavujugejera.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/80kls7nr22s554n0p67411jd13/pulilopinavomozubijosurol.pdfIn PDF document text
    • http://autoshiftbid.com/fckeditor/userfiles/file/lomopi.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021062303474765.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160799d5115918---18532072284.pdfIn PDF document text
    • http://e-skala.pl/userfiles/file/79674023986.pdfIn PDF document text
    • https://vibanghanoi.com/uploads/files/37200500767.pdfIn PDF document text
    • http://hongphuc.vn/userfiles/file/sefirul.pdfIn PDF document text
    • https://paklya.su/design/img/upload/file/fubexov.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160769cacc68ae---12182486187.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=example+of+a+double+displacement+reaction+will+bePDF link annotation
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/d69b581a0aea6af1a1c80c1bb62576c0/wovivumug.pdfIn PDF document text
    • 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_off0000e3f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3F2 11192 bytes
SHA-256: 914713dec4ad779d7f7005b23dcdddd0e7dab706043b19e04f5dbac5b8132b42
font_01_sfnt_off0000fdf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDF1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011603.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11603 18052 bytes
SHA-256: 3da98a2a3baca8d16a7fb887e6d1d6d49c3ee8437b08c3a6c833d06d79031721

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