Malicious PDF — malware analysis report

Static analysis result for SHA-256 604447862dab3d5c…

MALICIOUS

PDF

108.9 KB Created: 2021-07-18 00:17:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 517e8fd925bc2daec5038e164106462d SHA-1: 93ea05be6a0dcf2f00a92ba9ccb20f872b40a35d SHA-256: 604447862dab3d5c9deb593951cb5ee68a7f3b1066a21b0f55e698a24c522301
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which appear to be hosted on compromised WordPress installations or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF used for initial access.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9882

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://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfde1262ebe---17706939509.pdf
    • http://hillcresthigh1971.com/clients/9/9f/9fbf9047a6869172a982db6f42f05a9a/File/86307284460.pdf
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/ae7928086fd9b118b814a2f569b3055f/zepigalupaximejev.pdf
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/f0ldnvdoq3alem5p0rfn0jru46/40790874325.pdf
    • http://planao.com/ckfinder/userfiles/files/lovirak.pdf
    • http://kondicionery-vidnoe.ru/upload_picture/file/gevobonux.pdf
    • http://zimmerei-possert.at/30935755357.pdf
    • http://orchid-daikanyama.com/userfiles/file/64082493007.pdf
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e233edd767---90139277448.pdf
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160982ade98452---26457614562.pdf
    • http://starlightcelebrates.com/clients/4/43/43e9139217482d7666ce300faf566241/File/vezofonomawuvunazugijeliw.pdf
    • http://doktor-okonski.pl/uploadimg/file/79644150124.pdf
    • http://sun-green.be/ckfinder/userfiles/files/27287237778.pdf
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609dcaa70ef6d---sololubawatokuwuwoxudako.pdf
    • https://seitonsolutions.com/ci/files/74138079232.pdf
    • http://www.vikingmaterials.com/img/gizigovamuzafe.pdf
    • http://phuocthuan.vn/images/pic/file/mepomuzasavese.pdf
    • https://hunde-katzen.at/soubory/81932977306.pdf
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/skd2klqkm1qc2nnnpp88hi8qe0/815435346.pdf
    • https://ebooksweb.net/files/file/6926942343.pdf
    • https://123natura.com/stockages/files/rixowasub.pdf
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16080adda80404---80972521978.pdf
    • http://dblbtech.com/userfiles/file/83224450671.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=gann+square+of+9+simplified+for+profitable+trading+pdf
    • 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_off00012cdb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12CDB 16792 bytes
font_01_sfnt_off000144ec.bin
34837fdfed7e6dc9e8c1ebc45eabef1064a6e89f8cd536305124148a4af1fb29
pdf-font-stream PDF embedded font (sfnt) at offset 0x144EC 16168 bytes
font_02_sfnt_off00015a84.bin
eca0d30fa257c1a7ebe9d0d54dde48af919154e189880a034adadf178807788f
pdf-font-stream PDF embedded font (sfnt) at offset 0x15A84 11432 bytes
font_03_sfnt_off000174c4.bin
a531d8942672add2573b6f10727350258b672c049ccb167d3f9a578237b5dc36
pdf-font-stream PDF embedded font (sfnt) at offset 0x174C4 18228 bytes