Malicious PDF — malware analysis report

Static analysis result for SHA-256 925dfc1c6f1c5955…

MALICIOUS

PDF

88.6 KB Created: 2021-06-29 01:24:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a439b0d3499870e08fa4d0c49d01988f SHA-1: 2f4ed062758e85f5cc654732382124d7a3676773 SHA-256: 925dfc1c6f1c5955ac633df793475ea96730552d5d90f9a2c33fc69c1e1369b7
156 Risk Score

Malware Insights

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

The PDF contains a link farm, directing users to multiple URLs hosted on compromised WordPress sites and disposable domains. This behavior is indicative of phishing or malware distribution, as suggested by the ClamAV detection and ML classifier flagging. The file's purpose is to lure users to external sites, likely for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://alexanderjamesbackcatalogue.com/userfiles/file/27821213496.pdf
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071ccc668e5f---vepopa.pdf
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/73a2fd249f3762101b61a7cc8151ed90/sozekexilegumudetew.pdf
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160845ce947ff3---45210026490.pdf
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b7375dd51f---liwotepewupamixawikig.pdf
    • https://glbtrader.com/userfiles/file/bijofinasupazojikiwa.pdf
    • https://decoveinvestment.com/userfiles/file/2221212775.pdf
    • http://drivingschool-brno.eu/files/razadepevawu.pdf
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607087d471b6e---tinobibepoj.pdf
    • https://prairieroseclothiers.com/FCKeditor/file/savitazopujijitok.pdf
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/aef196be1277ac940d3fa936806a50a4/71842128600.pdf
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca79eb187f---kurowe.pdf
    • http://ixtvs.de/_upload_bilder/_filemanager/file/didetu.pdf
    • http://grappin-annat-como.com/userfiles/grappin-annat-como.com/file/39902907784.pdf
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160bc54ecee2b6---66184263019.pdf
    • https://fereshtegan.net/basefile/fereshtegannet/files/zakunurenivejudenigake.pdf
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/16086efdfc286e---barazoxexovitegat.pdf
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/9dc256806a0595519854d21687152154/zebivajonakidozunilokat.pdf
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/1472cf6de1faebe1b87a2964cfd27572/80188298795.pdf
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160737fb8ca3dc---zulawulokusosuzipe.pdf
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/48c6c3fb1e3b3facc548dd351015ccfa/zoperafupag.pdf
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/ocua824ime1gaokpj3qrg40lvd/kivexixoponasat.pdf
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160b5769cc883e---wudulilomalezinadofosi.pdf
    • https://markeishahall.com/wp-content/plugins/super-forms/uploads/php/files/dca2d8c808184eb65d4f73dba442c46c/monisabimupudebobido.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=painful+muscle+spasm+under+right+rib+cage
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f827.bin
48345a5e585bba53139f1800a27568e65c8aab2e4827c388649f5f298109b4c8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF827 16720 bytes
font_01_sfnt_off00012394.bin
ade4fe1e1e5063a63c171d3e90b855056f4fd943174e6419c5721edb1e1eedb8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12394 11188 bytes
font_02_sfnt_off00013d1a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13D1A 16792 bytes

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