Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab73e3296d3cdb2f…

MALICIOUS

PDF

80.6 KB Created: 2021-09-02 02:11:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d10783179f305b6c4f7f09f053f1626a SHA-1: 544373084b4f8da4886680e612affa54709b5c73 SHA-256: ab73e3296d3cdb2f86eac99f75d174314fcd220c8a46ce39940af83d4af7086d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that form a link farm, directing users to compromised websites and potentially disposable hosting. These links are likely intended to lure victims into downloading further malware or submitting sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://crewmak.ru/uplcv?utm_term=meaning+of+cohabitation+in+marriage PDF link annotation
    • http://basumati.com/app/webroot/ckfinder/userfiles/files/57953885788.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/g4cohtnau9dtc5tc5lbur5alu4/kisufapurezowivaru.pdfIn PDF document text
    • https://koltoztetes-szallitas-lomtalanitas.com/ckfinder/userfiles/files/powubosekibipo.pdfIn PDF document text
    • http://debeleven.net/UserFiles/File/38558435014.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b33c78b093---vamovinowadigofokop.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf44842bf2a---monebuwozexunafirasofuku.pdfIn PDF document text
    • http://pnktools-th.org/ckfinder/userfiles/files/96189022746.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/1608f6a4080f4e---gepuk.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16113433b70a04---nodilibeleluzep.pdfIn PDF document text
    • http://thanhtindesign.vn/uploads/image/files/bozafejumakifilewokinid.pdfIn PDF document text
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/01651784657bcafb7888029b743c0cbf/xodexuxebipodovuta.pdfIn PDF document text
    • http://greenbrier101.com/userimages/rugilegibobuto.pdfIn PDF document text
    • http://asijskepotraviny.cz/files/file/25422500672.pdfIn PDF document text
    • http://kiameds.com/images/upload/files/52988807124.pdfIn PDF document text
    • http://parzenica-bialka.pl/userfiles/files/voguroxaribawawerarujaju.pdfIn PDF document text
    • http://designklasse.de/ckfinder/userfiles/files/nunulerovaw.pdfIn PDF document text
    • https://scavilecis.it/userfiles/file/60158144280.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/42397799454.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8886f3fe4e---polugebesanozekalegotegaw.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/4ee6ea455e3fd93735dc101ca35d2a11/45739917420.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_off0000d7df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eff6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF6 10704 bytes
SHA-256: 5b7c1cfea7932189e0ddbe235be7e0218c8ce780fe2f4af19c293195679e6c1c
font_02_sfnt_off00010848.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10848 17256 bytes
SHA-256: 6d2fff576075b08b4b2fda4c00ba2770a06c65d308c54aa1616579485e9df126

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