Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb8274faf022158d…

MALICIOUS

PDF

69.9 KB Created: 2021-10-02 03:48:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: dc274773d02636f5f772e4b6b49b400b SHA-1: 30e3bbd8a58fbf261205b3f61ec92afb778e3a21 SHA-256: fb8274faf022158d87112449a54052cd377874071be31678f9629e648075e332
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS uploads. The embedded URLs suggest an attempt to lure users to phishing or malware download sites, likely as part of a spearphishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://infrive.ru/uplcv?utm_term=microsoft+word+2010+product+key+64+bit PDF link annotation
    • https://www.asoriofrio.org/ckfinder/userfiles/files/xumusukazazazajokajuto.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161328b1425245---wibuwelo.pdfIn PDF document text
    • https://bike-accessories.supersites.gr/content/ckfinder/files/63647300219.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/5deec8352dc7a26e7382faad80acddcf/xakaxofeligi.pdfIn PDF document text
    • http://topflexsports.com/uploads/30312468026.pdfIn PDF document text
    • http://st-johnson.com/Uploadfiles/files/48807192773.pdfIn PDF document text
    • https://alstar.uz/images/shared/file/xurewakotutufobupi.pdfIn PDF document text
    • http://punaide.com/userfiles/files/69334621830.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/6cb980cecea41843d801133a0d43e468/tobeminalikak.pdfIn PDF document text
    • http://ijdssymposium.eu/upload/35408788690.pdfIn PDF document text
    • https://www.aicsmindia.org/ckfinder/userfiles/files/mazaledijipegona.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1614ba20d05496---nozilevokajitajaweluvagur.pdfIn PDF document text
    • https://harom.ro/files/file/9085409443.pdfIn PDF document text
    • http://rooptex.com/uploads/bigusedunorix.pdfIn PDF document text
    • http://mlead.net/images/e/file/suvabizowazowupewogu.pdfIn PDF document text
    • https://gogift-it.com/userfiles/files/nuzos.pdfIn PDF document text
    • http://i-harmonics.com/upload/files/wixupowuwikonenajuvenel.pdfIn PDF document text
    • http://gernano.eu/gfx/userfiles/files/91233826278.pdfIn PDF document text
    • http://ideviceplus.nl/app/webroot/files/userfiles/files/17702057055.pdfIn PDF document text
    • https://gtselect.fr/ckfinder/userfiles/files/13523446302.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/q58am9mnp9q3mmar5o63381hpk/besutusegorewirabase.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/fasadavajojegovilakenudid.pdfIn PDF document text
    • https://kompaspt2.com/contents/files/tewidemabirimorema.pdfIn PDF document text
    • http://louisiana-arts.org.s150269.gridserver.com/siteuploads/editorimg/file/sobufanejewejatusakepifu.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_off0000affb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFFB 15416 bytes
SHA-256: db5667f35053770cae5d5968db24961a7895311878ce92ee9d72dad9d4b41a15
font_01_sfnt_off0000d6d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6D8 11364 bytes
SHA-256: d6747fa81f09deb2c9f4747cc51ddef50b8877989ff43729e4913e35190c04c9
font_02_sfnt_off0000f1cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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