Malicious PDF — malware analysis report

Static analysis result for SHA-256 904368511b1a6a91…

MALICIOUS

PDF

73.3 KB Created: 2021-09-05 23:49:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d266e2e44ebdb9b65f21d27204643fb4 SHA-1: 27667dd42099f3cffa16711d0a56492df3a402aa SHA-256: 904368511b1a6a912a37db567fa947a26a009cd826c42aeab8b75615b462fba4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous links pointing to compromised CMS upload storage and disposable hosting, indicating it functions as a link farm. The primary purpose appears to be directing users to potentially malicious external websites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/a23tedrkuf647bkotj9766gdqr/muponeb.pdf In PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/16078ac5ce3cbe---fukuwexavepivewut.pdfIn PDF document text
    • http://ashokarefrigeration.com/userfiles/file/vonegulufaguz.pdfIn PDF document text
    • http://maychaybocaocap.com/app/webroot/uploads/files/4984322276.pdfIn PDF document text
    • http://dearbornshs70reunion.com/clients/c/c6/c6cacd1d9512a3effe7244eb89d69e0e/File/relulizenopepegoborakibiz.pdfIn PDF document text
    • https://godparents4tz.org/home/god/public_html/ckfinder/userfiles/files/57181759127.pdfIn PDF document text
    • http://edwardfmcgintypa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zanekufejitupofoxajafefiv.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/tq9h5pdn0tnipo9bn775kvopl9/89166744474.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/8b9a5a61f5b6f178126653d1388bd78b/dudenonesere.pdfIn PDF document text
    • https://brianhigbielaw.com/UserFiles/file/13362789175.pdfIn PDF document text
    • http://creative-format.com/upload/editor/files/32616844869.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/dp1hr37v82dipseodtd70iq88t/mirubusezozeridu.pdfIn PDF document text
    • http://www.fashiongale.ro/userfiles/files/46189836085.pdfIn PDF document text
    • http://www.dawnrotaryclub.tw/UserFiles/files/timisuzigivezamo.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074d54606be4---40520973115.pdfIn PDF document text
    • http://hoaisonland.vn/upload/files/58102095276.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/g4q7ildomrk1k4jui3d0mdcaqg/faledig.pdfIn PDF document text
    • http://kap-group.com/ckfinder/userfiles/files/pekamepuronidusujamanewu.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3bd4e9203---zazap.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/1370ff6c329569046b2e2988d3030656/gezajukidavixoburelave.pdfIn PDF document text
    • http://gencshow.com/upload/ckfinder/files/totufitazupixed.pdfIn PDF document text
    • http://studiotecnicopetrillo.eu/userfiles/files/gonudoxilovozekuwixafuka.pdfIn PDF document text
    • http://rc-mst.com/mst/_upload/files/5381118267.pdfIn PDF document text
    • http://raczcsalad.hu/files/xujugoluba.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=php+manual+array_unshiftPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/011636607c016faaa002b5cb5e4935b7/7934824687.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_off0000bc48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC48 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d45a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD45A 16852 bytes
SHA-256: 071a48c7bce8b87a32851fd7280981d326a03dab2d69cf9612c449b0bab4ca4a
font_02_sfnt_off0001002a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1002A 10616 bytes
SHA-256: 12c1d75fd2d6c3f2632b6ce0fc6e2f17cc0452247a08c544c7a54baacebf271c