Malicious PDF — malware analysis report

Static analysis result for SHA-256 378e519e138b3d8a…

MALICIOUS

PDF

78.8 KB Created: 2021-10-05 13:48:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: cfc6b9cb9262128fe699cbcbfb6e8d4b SHA-1: 3ad65fc3c5972649938a1524360c73bd4223540b SHA-256: 378e519e138b3d8a944b1c6c6891827dab5391f5b847cb7d66f03f988681c034
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress uploads and disposable hosting, indicating a link farm designed to redirect users to potentially malicious content. ClamAV and ML classifiers strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16159ca953dec8---38341774555.pdf In PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/tuiv8qgtqatluhsnbmurgooge0/dibavopakadudavetozazov.pdfIn PDF document text
    • http://otohyundaidanang.com/uploads/image/files/lunemumumigikifidam.pdfIn PDF document text
    • https://299-45.com/CKEdit/upload/files/24053599242.pdfIn PDF document text
    • https://digiconelectronics.com/media/velifuvuvexe.pdfIn PDF document text
    • http://gaytonfa.com/upload/files/pafofiripotegu.pdfIn PDF document text
    • http://ch-bovi.com/upload/files/69951805716.pdfIn PDF document text
    • https://trinityautorepairs.com/uploads/files/67639197910.pdfIn PDF document text
    • http://elektrostroy.kz/ckfinder/userfiles/files/tuxifiwatowolavumorigap.pdfIn PDF document text
    • https://krainaogrodow.eu/zdjecia/fck/file/jisojeganosunu.pdfIn PDF document text
    • http://ags-sib.ru/ckfinder/userfiles/files/83290991855.pdfIn PDF document text
    • https://ibextrail.com/editor-images/nezopedevekifav.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/16137990d4322e---guvames.pdfIn PDF document text
    • https://giasidaily.com/uploads/userfiles/file/lexal.pdfIn PDF document text
    • http://cka-shiba.com/ckfinder/userfiles/files/61890372533.pdfIn PDF document text
    • http://vallovin.it/userfiles/files/xupudesejupipizov.pdfIn PDF document text
    • http://usairsprings.com/userfiles/file/10873311240.pdfIn PDF document text
    • https://jotelek.hu/files/file/xiterovijemole.pdfIn PDF document text
    • http://chenruichem.com/upload/files/ponajimapujitenadil.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=time+difference+between+eastern+and+mountain+time+zonesPDF link annotation
    • https://easyown.ddproperty.com/datas/files/36864341484.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_off0000cb2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB2D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e344.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE344 10940 bytes
SHA-256: a21269d94612b9e574628bc2fe3cfcec0160b0e545f94b0eea279decc4c65e9c
font_02_sfnt_off0000fcba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCBA 18920 bytes
SHA-256: 13febb1b0a4f9a10076c4e0d89d5ef86058918c2684a02221c824d8725309c67