Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdc40d3f2dccf0f2…

MALICIOUS

PDF

49.7 KB Created: 2021-09-25 05:08:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2b25b7d4e28d1d6c90a75ffd48cddc6f SHA-1: 61bda6a529b36c2234c80f63b79a4f7e4a6d5cd7 SHA-256: cdc40d3f2dccf0f22647f26f081df604aedf4c7da0cd10f80fcda8f11ce2cd73
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF employs an image-based lure, a common tactic for phishing or malware delivery. It contains numerous embedded URLs pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to download a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8678

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 49 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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
  • 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://krisoc.ru/uplcv?utm_term=physics+formula+sheet+with+definitions PDF link annotation
    • http://multi-accueil.fr/ressource/site-image/files/tulipijerozulet.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1614d843d43e8d---97340257076.pdfIn PDF document text
    • https://rt-totaalafbouw.nl/userfiles/file/sakodedoromaxusisa.pdfIn PDF document text
    • http://mtsskzy.com/userfiles/file/1702005814.pdfIn PDF document text
    • https://vegastel.eu/components/com_mijoshop/opencart/image/data/files/55163987020.pdfIn PDF document text
    • http://veraschwemmle.de/fckdata/file/zowitanafiso.pdfIn PDF document text
    • http://autoscuolauniversale.it/userfiles/files/96657481533.pdfIn PDF document text
    • http://goddesshair.net/upload/users/files/zexabikejonomapipawoli.pdfIn PDF document text
    • https://pomacanthe-art.fr/imagebeforeafter/files/89088009525.pdfIn PDF document text
    • http://jpsacademy.com/slbdavbatala/userfiles/file/26094459106.pdfIn PDF document text
    • http://jun-travel.com/userfiles/file/31741820141.pdfIn PDF document text
    • https://orsam.org.tr/paketler/ckfinder/dosyalar/files/23061391549.pdfIn PDF document text
    • http://evevoyance.fr/adh/.-/file/76749499217.pdfIn PDF document text
    • http://hatdesechia.com/storage/ckfinder/files/gobosot.pdfIn PDF document text
    • http://jysfh.com/upload_fck/file/2021-9-4/20210904040318307519.pdfIn PDF document text
    • https://fanaf.org/article_ressources/file/xidagemomamiweroz.pdfIn PDF document text
    • http://soupworld.de/upload/file/61991562174.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/68ec391bcd1af1c0d3c6fbc5f52e3356/sokureguke.pdfIn PDF document text
    • https://jkmart.net/FCKFiles/File/35649021116.pdfIn PDF document text
    • http://web5gstore.com/Files/files/zopizonuvefab.pdfIn PDF document text
    • http://dlastudenta.org/Upload/file/65994048926.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210903214650328.pdfIn PDF document text
    • https://pecintajp.com/contents/files/76136620447.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613083f64d2ed---duxigugefafedujonon.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e7afb13243---42205247888.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b350.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB350 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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