Malicious PDF — malware analysis report

Static analysis result for SHA-256 d813e2bc66812e86…

MALICIOUS

PDF

122.7 KB Created: 2021-08-07 12:13:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 1fd3c61747b095d365687f27a6559abe SHA-1: 670f492be184152b45695289eec115dd6e25561e SHA-256: d813e2bc66812e86c30db47ce76f7361bebb48bf5ed3da355153d55bc2538c43
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting it functions as a link farm. The presence of 'utm_term' parameters in some URLs indicates an attempt to track user interactions, likely for phishing or malware distribution purposes. No scripts were extracted, but the overall structure and URL patterns are indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://wastran.ru/uplcv?utm_term=burger+king+menu+2+for+5 PDF link annotation
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/ab3a70f4ee19a1155bca42d8db6d9130/65104262120.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/tvc249biv4f7ib2vmlpd9l8lh3/rofet.pdfIn PDF document text
    • https://remoteworkerclub.com/wp-content/plugins/super-forms/uploads/php/files/901dfe60f08bdacdfdb6dfa1936d8271/nazedewanojegu.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/2eb12acd26c44586c9244242741d76d8/vunulukukuvedimuwinoku.pdfIn PDF document text
    • http://myshopekerala.com/userfiles/file/96103181896.pdfIn PDF document text
    • https://sherwoodchamber.org/ckfinder/userfiles/files/siporadolesalerabuvale.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e83c217174---36361060908.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/dac0b1769631eb103c5533f9790659b0/zopagifivon.pdfIn PDF document text
    • http://bitree.net/ckfinder/userfiles/files/nesad.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16074ae6705e39---xibetikojeberuwixixupif.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/gihjvujvj00lt33t58p12rlm13/14570446724.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ce97a66e431---61360410319.pdfIn PDF document text
    • https://tyeetomsfishing.com/userfiles/file/66710067227.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/45710664860.pdfIn PDF document text
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/02e4f532b24cbf540999a0d6f1ed941f/nazetoramunotoz.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/b474b5f9cb697ccd890adf3a09340599/13999720912.pdfIn PDF document text
    • http://sage-chem.com/image/files/20210713_210428.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/773f1a70aadcc494554ae3022591fbae/96328945060.pdfIn PDF document text
    • https://tiguan-wiki.ru/file/73069619994.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/d288f13d4b9122ba9f80b7a99c18a73c/gesowebataxirururusoka.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f9f5571c40---burumitifol.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b442517e32c---mejevologuxupulel.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/afq8fmbdi2o6mv9ckeqf83qsqn/66146241693.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077fd006ca81---dejirunuvowinudopixo.pdfIn PDF document text
    • https://agriturismoilcolle.org/userfiles/file/semuzajededalaxux.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_off000178e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x178E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00019100.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19100 10580 bytes
SHA-256: 755abeeb576d53701e825c1b2972c637ab6b6fe011ef27708a6fae43b7a79969
font_02_sfnt_off0001a933.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A933 18736 bytes
SHA-256: b577ea7e834d587365dafc901129a3939d137e675499f7b643a160ef46b987eb

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