Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8dbe38999700d87…

MALICIOUS

PDF

104.9 KB Created: 2021-08-15 05:21:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 64ad7f4529bc32924b33bd55ec90eb51 SHA-1: fe09ad040fd62e10e4b30df56dd8092bd21006a9 SHA-256: b8dbe38999700d87c9b2ff8317364e5d9c812ec876a24cb28dec2031fabc3517
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs pointing to various websites, many of which appear to be compromised CMS uploads. Heuristics indicate it's a link farm designed to redirect users, with one URL specifically mentioning a 'junior scholastic skills sheet answer key' to lure victims. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://nomylo.ru/uplcv?utm_term=junior+scholastic+skills+sheet+answer+key+2019 PDF link annotation
    • http://kompletucetnictvi.cz/files/file/wukotabojiviwatuna.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/92c9eeeb1ebf1d05583899f3c77d3ea2/rulatizebafofe.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160956077d0f68---99165608115.pdfIn PDF document text
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/9feeececa8b48e0fe58aa0cfd57dcbc8/38823317221.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/f30b71310af0c7dcf358844a3bc4a71b/97311168592.pdfIn PDF document text
    • http://astro2sphere.com/admin/images/file/42697642864.pdfIn PDF document text
    • https://betentour.com/sites/default/files/file/xerebexefopibukidaxis.pdfIn PDF document text
    • http://somersetcountybar.org/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gujovedaganizinilisal.pdfIn PDF document text
    • http://tbff-bygg.se/img/files/62359595712.pdfIn PDF document text
    • http://gospel-pour-100-voix.com/fichiers/newsletter/file/68244112472.pdfIn PDF document text
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/93fdjud3cupmbrjndhce2h0a6d/64706239143.pdfIn PDF document text
    • http://t-eamplus.de/web/editor/files/21824068917.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcc09d8bc06---madopikixivipijil.pdfIn PDF document text
    • http://risorsaterra.it/userfiles/files/58360761414.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b6d48f4ca9a---83530419375.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1610ad757b778b---98085639012.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160ae5ad7b11eb---64376158832.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079f0bd28caf---36059161824.pdfPDF link annotation
    • https://baigiangtoanhoc.com/upload/files/83087873143.pdfIn PDF document text
    • http://robertfeinberglaw.com/images/edit_images/file/48308320883.pdfIn PDF document text
    • http://coumert.com/images/file/50569718795.pdfIn PDF document text
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b9a9c6ce8a---zivopapamanij.pdfIn PDF document text
    • http://brenno-tojestto.pl/userfiles/file/6719490115.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/7341107bce5a6c039410f1c0ef32d862/72270734499.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_008_off000177a8.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x177A8 18048 bytes
SHA-256: 3d0c6f5000235aa22940a23225f2e9b82392b17eeb762461292f675582cfdf9e
font_00_sfnt_off00011593.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11593 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012da5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DA5 18028 bytes
SHA-256: 8f41ada8d34ac8b59ca38db2eea055f336b072e193aa98b74f0abc18a5953302
font_02_sfnt_off00015d51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D51 11172 bytes
SHA-256: 13ac4bf6603afb584ae019eb671b0b995184f1473291e57cc5fed218cf215a38

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