Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3fb4480dda2d35c…

MALICIOUS

PDF

87.1 KB Created: 2021-08-20 19:46:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: a82264a78af537b7cda4817a52549ad7 SHA-1: 3839feceb7597b7831fcb87b79d589d77d4ee1dc SHA-256: f3fb4480dda2d35cfd5f8ee321fbc32c62a605d60a976740c6b1b7c0d8aa43b4
236 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a ClickFix paste-and-run lure and a password-protected-archive lure. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://iskoruma.com/upload/ckfinder/files/xavakukagifemupigukiwifog.pdf In PDF document text
    • http://evolutionchonburi.com/userfiles/files/vetarazobixixesiw.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/od7p7kn3ct2tbo726ot12qbko4/60035643364.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/92499992948.pdfIn PDF document text
    • https://akvaguru.hu/user/file/9047708192.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072d12a55cfe---foziwe.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/16118d0a7ecc8d---dadamamiriwit.pdfIn PDF document text
    • http://thebeautyofdesign.nl/ckfinder/userfiles/files/43496815971.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/3up44vn2ncf4rdff5kt2q210p6/21784901770.pdfIn PDF document text
    • https://genegurumiraclehealer.com/userfiles/file/fewosiwagaxisonaw.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7958598f8e---wefar.pdfIn PDF document text
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160766a85a9259---xadudovobadaborivazata.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/s1u1nqmi93mvvjp067ta3mthm7/kulininotogupupiwin.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afa9b3eb422---76813153995.pdfIn PDF document text
    • http://arcadia6465.com/clients/f/fc/fcac8d81e62e7f23ed02b02243def538/File/49313757170.pdfIn PDF document text
    • http://grotech.in/userfiles/file/95112289396.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071b2a8d9781---8318198399.pdfIn PDF document text
    • https://angkoronetour.com/userfiles/file/20458395592.pdfIn PDF document text
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/16070b24696bfa---gevaditalagulujesafo.pdfIn PDF document text
    • http://writtenmail.com/upload_images/file/putizevodubo.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/0478199fdddce4d1b049837fcbc383df/6751412265.pdfIn PDF document text
    • http://kardelendalgicpompa.com/uploadfiles/file/vitoreg.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/7ehsp94ubedtduih9dhh52gqvs/fefibozixi.pdfIn PDF document text
    • https://rubyyadav.com/nbloom/fckuploads/file/mepajolavobezixoluzib.pdfIn PDF document text
    • http://keralabiblesociety.com/fck_uploads/file/kakepubatadopomudej.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fa50a71931---rimakagesivemovikozogasox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=lista+de+comandos+cmd+windows+10PDF link annotation
    • 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_off0000eee0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE0 17804 bytes
SHA-256: ca7ca1491a88f0627169dec8b7c7f4bf2ceaca0e9d47e387215b9b9e959fb00d
font_01_sfnt_off00011c81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C81 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013498.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13498 10604 bytes
SHA-256: a642c2644f2035da4a3de5ca0c86ceac7378beb18c6ba6e4fd0de0bada56093f

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