Malicious PDF — malware analysis report

Static analysis result for SHA-256 e10d0a01cc887678…

MALICIOUS

PDF

80.4 KB Created: 2021-09-18 19:46:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 08c5c3d49c52c31c5626b5835243f9f3 SHA-1: 46ce63d5ce755c9bbd0b07f656f93ab656d8bae4 SHA-256: e10d0a01cc887678a6a2f1495db999249c7607edeb3c3a54267551e5b8cc9952
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised CMS upload directories, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body is heavily obfuscated and appears to be non-readable content, typical of exploit-laden PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://garglob.ru/uplcv?utm_term=use+database+in+android PDF link annotation
    • http://harlit.com/ckfinder/userfiles/files/20210910_081902.pdfIn PDF document text
    • https://inprovitparaguay.com/ckfinder/userfiles/files/zuxef.pdfIn PDF document text
    • http://xn--80aaa1acmiejxr6d7fg.xn--p1ai/data/files/31378487441.pdfIn PDF document text
    • https://butterfly-propertymanagement.com/userfiles/file/70729766160.pdfIn PDF document text
    • https://ccs-corporation.com/ckfinder/userfiles/files/72182335353.pdfIn PDF document text
    • https://martas.vodrsport.cz/uploads/files/tefejopaxinexopetexov.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138c98687fc8---43159339702.pdfIn PDF document text
    • http://vallovin.it/userfiles/files/rafatonorubok.pdfIn PDF document text
    • https://aymexco.eu/ckfinder/userfiles/files/47303050650.pdfIn PDF document text
    • https://loyalangkorapartment.com/userfiles/file/benaditaxigodudasage.pdfIn PDF document text
    • http://forumcutuca.com/ckfinder/userfiles/files/xirasejufavonufixibavudid.pdfIn PDF document text
    • http://architettorobertafasola.eu/userfiles/files/37460725149.pdfIn PDF document text
    • https://www.greenlakecruises.com/ckfinder/userfiles/files/vodevanikizijar.pdfIn PDF document text
    • http://ztkammer.at/uploads/file/ketikovewiwavujareniranu.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/7074adf9572eab08cb2a327f73e8c4d8/71681728349.pdfIn PDF document text
    • http://drsuthichai.com/userfiles/files/32797713277.pdfIn PDF document text
    • https://pbanerjeeservices.4digitmagic.com/userfiles/file/27503225468.pdfIn PDF document text
    • https://sgcaregiver.org/contents/files/dedinefufirel.pdfIn PDF document text
    • https://gabinetpro.pl/kosmetyczka/krakow/files/91885036083.pdfIn PDF document text
    • https://akvanova.ru/sites/default/files/vifosedoler.pdfIn PDF document text
    • https://bodegoncriollo.com/userfiles/file/perorupilolas.pdfIn PDF document text
    • http://montazenabytkupraha.cz/files/file/susupozevomibusawifuzi.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144dd45b7441---podeganuzomezemovusa.pdfIn PDF document text
    • http://bnblspecialities.com/userfiles/files/fewabukudomevanedat.pdfIn PDF document text
    • https://kaktutzhit.by/uploads/files/9531150077.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_off0000d7e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000effe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFFE 10340 bytes
SHA-256: 98f27f09c9fd4c4123d6bf768526d40d45f44c20feae1702e9de0e63d5f1b34f
font_02_sfnt_off00010779.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10779 17220 bytes
SHA-256: 3b627e2bf449697a6cb57f170a5c0fd705a9e948bab58ec21eeb4f23be3178c5

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