Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e4c9b8e205c7508…

MALICIOUS

PDF

124.5 KB Created: 2021-07-13 08:13:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c498bbf06fe154083ac0e35b3f9d2852 SHA-1: 9e3c1507bd33fe7552da98fe3d2f26cc43095f9b SHA-256: 0e4c9b8e205c7508dd9d6fbbc5bde5037a7419ee03b252922b90b8b8c9e11739
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, pointing to numerous distinct hosts, many of which appear to be compromised CMS uploads. The embedded URLs suggest an attempt to redirect the user to external, potentially malicious, content.

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://holocaustresearch.pl/nowy/photo/file/8645495844.pdf
    • http://www.scsi.coop/wp-content/plugins/super-forms/uploads/php/files/a43b936b0f49d403607621a5705c0626/rozuzuwupilelu.pdf
    • http://asiadomainstore.com/userfiles/file/jasomitumefokarazed.pdf
    • http://alpanelektrik.com/depo/sayfaresim/file/zazivuxiv.pdf
    • https://lasvegasrebath.com/wp-content/plugins/super-forms/uploads/php/files/6ba8a7606aa872814243277fd744d50b/48208638352.pdf
    • https://www.geya99.com/ckfinder/userfiles/files/zajidewimijup.pdf
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b5bd7f8c3fc---lovejaliwudubatutuxu.pdf
    • https://avgdesign.com/userfiles/file/nogugetilewobepawe.pdf
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/38f40af3da1fca711b89ec017511067b/nesomugifixegojipineraw.pdf
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb926537d8---86178496978.pdf
    • https://accesoriosalmayor.com/images/userfiles/file/9177137699.pdf
    • http://aqbnb.com/uploadfile/file/sopokugakanuruvofog.pdf
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075f7e492fc6---zojogolizufaliv.pdf
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/phsgpgo6gldp1rjf29bgs6n8s7/dazomoloburorejuxa.pdf
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/p4shrblkdocvbs4fod1hb2qe7g/70378694236.pdf
    • http://xn--80aaffebba2apgigwiiececnggk9e4k.xn--p1ai/pict/file/6215329161.pdf
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/2474c01194ca17a6a99cc919d3921797/3877984265.pdf
    • https://pointsourcegroup.com/wp-content/plugins/super-forms/uploads/php/files/33ed92f1593bd9a1025222a19b31debf/ruresugoj.pdf
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16075e9dfd711c---zelerebuwixiremakewumov.pdf
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/caac2333edafe4fd8666b571c26412ba/topizaxopozul.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=canterbury+tales+publication+date
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00016c4a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x16C4A 16792 bytes
font_01_sfnt_off0001845c.bin
0f44552e9d0a25ec4e01b1aa8a9311c776cbae5a5c012f5a2c25d181af83bf55
pdf-font-stream PDF embedded font (sfnt) at offset 0x1845C 19004 bytes
font_02_sfnt_off0001b611.bin
cd995502891255dfbcf4afd28e083ab8bfc87dc57603266f4586087dd25ac3fe
pdf-font-stream PDF embedded font (sfnt) at offset 0x1B611 16100 bytes
font_03_sfnt_off0001cb6a.bin
ef7b5995b4d0ee34c31a387d17f7813993e76c9a99bac5f990ac69dc1b2ce90f
pdf-font-stream PDF embedded font (sfnt) at offset 0x1CB6A 10892 bytes