Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb7992c4aab8547c…

MALICIOUS

PDF

94.2 KB Created: 2021-09-07 07:25:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 38cd7671931d33b580a3b5740e8d147f SHA-1: 3b27082d020854ac8454b837ccd56fc23ea0b37a SHA-256: cb7992c4aab8547cc2f38908d8f15b97cd14f91c5d80526c90a20b68ab6e9c15
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to multiple compromised WordPress sites, likely intended to distribute further malicious content or phish users. The presence of urgency lures and password archive instructions suggests a multi-stage attack designed to bypass security controls.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://medvor.ru/uplcv?utm_term=manual+handling+operations+regulations+ireland PDF link annotation
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae919f5d7bc---wewotuzafitoxilo.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/16108bfa137903---38278307467.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/9487196883.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/30d1f8d1145987a2c3963a90930db09d/junovibaseda.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/a4c46d5cf4b0388e34758d47a0e6f592/62714936069.pdfIn PDF document text
    • https://tannhatviet.vn/upload/files/73411703369.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a3739ac8ca---61366735951.pdfIn PDF document text
    • http://eichler-kammerer.de/jafivis.pdfIn PDF document text
    • https://www.acta-mobilier.fr/ckfinder/userfiles/files/lizolenemosovigasoza.pdfIn PDF document text
    • https://toyotaautobody.com/ckfinder/userfiles/files/78443375669.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/qlviqa1kljth7isnq109gkqbfp/82660788709.pdfIn PDF document text
    • http://clinicaveterinariaalbese.eu/userfiles/files/83550945727.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/b11b159afb302ab8843f2919f39404ce/19463777403.pdfIn PDF document text
    • http://aggengr.com/uploads/CMS/file/tajafetirokogado.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/i9e1dgld7p7dhb6blip2ub2vqt/6995404699.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609dce8bddd5f---tapakusus.pdfIn PDF document text
    • http://martom24.pl/martom/userfiles/file/tutikosilirogiv.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/18hm313u4ccg55uabch3s9e9bv/kokibefulokijipenufe.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3bc2930f01600c642530bb01ac10f58c/98879739205.pdfIn PDF document text
    • https://binhvi.com/upload/files/faxatifufoz.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16087da6c3fd35---sabikapolub.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080e620d23ec---bimikuvuriduxopogituxifo.pdfIn PDF document text
    • http://studio5r.com/userfiles/files/lupozojukadawe.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098e8c653f68---gulopopewarodemamizow.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210516194813888.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_off00010b76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B76 10764 bytes
SHA-256: 3aa41ff58652c4705d9ead26a4ccbac1d4d4225f1a30a87099e7efb83fe5c9f3
font_01_sfnt_off000123e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123E9 18012 bytes
SHA-256: 3783491db2aedb079f3c8f6be6c3c3dad9c8127935509a44fb72ed3d70459e5e
font_02_sfnt_off00015295.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15295 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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