Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8caed3ee54309cb…

MALICIOUS

PDF

82.0 KB Created: 2021-09-09 10:53:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6e840b6c03c5ffcf80646976c81976c8 SHA-1: 597f7e9dab7cc329dbd0a3e2f1df1fb9b9b6225f SHA-256: d8caed3ee54309cb457d65bb5bb4181a751f5a6ce2bdca3bd584551884f2e325
196 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 of which are hosted on compromised WordPress installations or disposable domains, suggesting a phishing or malware distribution campaign. The presence of PDF_RANDOM_URL_LINK and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates attempts to obscure the malicious destination or leverage SEO tactics for distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://inwebjor.ru/uplcv?utm_term=how+to+print+only+fillable+fields+in+pdf PDF link annotation
    • http://younewstoday.com/task/userimages/file/jifin.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/161394ba779fcf---14233244131.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16138c5574978f---51902539752.pdfIn PDF document text
    • http://trumoi-khutrung.com/upload/files/6225111376.pdfIn PDF document text
    • https://www.kiemtoandongnghi.com/public/plugins/ckfinder/userfiles/files/84992422146.pdfIn PDF document text
    • http://murielbellhomes.com/userfiles/files/piwagazarigibazix.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/8td4tubd7olpvtn08d2cphonq5/rawibijawuzubelumig.pdfIn PDF document text
    • http://maciejabramowicz.pl/upload/files/file/65018044583.pdfIn PDF document text
    • http://svazekobciorlice.cz/userfiles/file/92332963546.pdfIn PDF document text
    • https://dovolena-jiznicechy.cz/uploads/nikulozepodajafokubepixu.pdfIn PDF document text
    • http://erdbau-rauch.at/9830777139.pdfIn PDF document text
    • https://rdsdealers.com/ckfinder/userfiles/files/93071696242.pdfIn PDF document text
    • http://ergo-logo-bamberg.de/userfiles/file/numuraw.pdfIn PDF document text
    • http://sgo-bage.com/public/files/files/nevijire.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/78723b86aa9bab313e888f888e07dc4a/zedug.pdfIn PDF document text
    • http://barcelonasixtytwo.com/userfiles/file/60658602537.pdfIn PDF document text
    • http://hsound.ro/images/custom/file/52184147331.pdfIn PDF document text
    • http://17njl.com/userfiles/files/ximos.pdfIn PDF document text
    • http://evo-models.com/uploads/userfiles/files/xuwiro.pdfIn PDF document text
    • http://belniig.by/public/file/72242044901.pdfIn PDF document text
    • http://www.accessibilite-salle-eau.com/ckfinder/userfiles/files/25115082265.pdfIn PDF document text
    • https://openkomm.yussfone-crm.com/userfiles/file/10019168665.pdfIn PDF document text
    • http://dar-tom.pl/userfiles/file/81637666245.pdfIn PDF document text
    • https://used-machinetools.ro/app/webroot/files/userfiles/files/44149018954.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_off0000da49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA49 10824 bytes
SHA-256: 7bb11f0af647a9092445d53b8fdcbe4809171516bad52634146b7671c7795663
font_01_sfnt_off0000f32a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF32A 18060 bytes
SHA-256: 96fc29831f92fe395fd6d2fe46d6df688ed2120f9f75b4f43ae0d027728ea981
font_02_sfnt_off00012264.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12264 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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