Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d8af84ca85c090f…

MALICIOUS

PDF

81.9 KB Created: 2021-09-02 14:07:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d95c26d890987558a31ee974f5d0b593 SHA-1: f6b57d236387ca63b7ced864dceda07b29deb30f SHA-256: 7d8af84ca85c090fe55a02b4dc9ba706a72f2a886708b8879485be92b1f43569
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous external links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users. The PDF structure and embedded URLs are indicative of a phishing lure, likely attempting to trick users into visiting malicious sites for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://drafthe.ru/uplcv?utm_term=xenogears+perfect+works+translation+pdf PDF link annotation
    • http://ozdoby-betonowe21.pl/Upload/file/nuwesubodurif.pdfIn PDF document text
    • https://www.helmmsp.ca/wp-content/plugins/super-forms/uploads/php/files/ff68b4f73073208c1206ff845505031f/79289600167.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad4f34dac3c---24111923549.pdfIn PDF document text
    • http://bensonlandscape.com/editorData/file/pewuwag.pdfIn PDF document text
    • https://ihotel2b.com/upfiles/editor/files/78501244862.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/81597b227a04e2010e8affe36c1efe70/6519814829.pdfIn PDF document text
    • http://sameiroeventos.pt/ficheiros/noluxibavegisuzif.pdfIn PDF document text
    • https://apz-arte.com/ckfinder/userfiles/files/21564020292.pdfIn PDF document text
    • http://cornaredo.gattinonimondodivacanze.it/themes/userfiles/files/zujemojoludidijila.pdfIn PDF document text
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3b8dd8ffe7---kumegegumijunovobebogegot.pdfIn PDF document text
    • http://www.hussco-steel.com/husscofiles/files/zufusifikofufebizijapude.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/2118b6d40d56c2019a009529b8f3d9cb/58895426606.pdfIn PDF document text
    • http://npxbyy.com/wang3_3_10_27/Upload/Upload/file/2021624753222610.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160901040d336b---dutomezutoretutosuwevo.pdfIn PDF document text
    • http://yjsyrj.com/userfiles/file/lamupi.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bace31d2d5d---goxosulowapaxadak.pdfIn PDF document text
    • https://toromecanicorodeo.com/files/vagare.pdfIn PDF document text
    • http://guinyardfamilyreunion.com/clients/62985/File/41789662949.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1610e1493d3334---ribigewavodedujasaba.pdfIn PDF document text
    • https://rewaqousha.net/userfiles/files/fagubesiluxogudelevoxuku.pdfIn PDF document text
    • http://erisalaw-chicago.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/23288248869.pdfIn PDF document text
    • http://modnyi-buket.ru/uploads/files/muzumalof.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/b4q0ma0nijr6s05rlhf4oo5bub/jezakopozolovom.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_off0000db7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB7B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f392.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF392 10980 bytes
SHA-256: fc76465a01c5cca36cd9d3e41a0df28af343a153611a30b3cceadf08d6bef680
font_02_sfnt_off00010d13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D13 17032 bytes
SHA-256: faf365f43c8e238a64808b679dc5d9278f2166a5d240ec4753fb4ca8beb372ea