Malicious PDF — malware analysis report

Static analysis result for SHA-256 38617883a1f91fbe…

MALICIOUS

PDF

71.7 KB Created: 2021-10-01 10:25:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d28c2ecbd7db7e20190300845ba790d5 SHA-1: ca3c7a8217218595f1cc1fef781a67c728e34d8d SHA-256: 38617883a1f91fbe2ade1d2b8f20f3eeb2905bc9e0626e13e081f0e8287c953c
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://xboxheerlen.nl/userfiles/file/3156732492.pdf
    • https://egyptsuntours.com/userfiles/files/5286942490.pdf
    • https://surupaceanu.ro/ckfinder/userfiles/files/nefeveredebawedowe.pdf
    • http://cybernet.asia/UserFiles/File/xajaribupinif.pdf
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614b16ab5467e---51482366963.pdf
    • http://ubestsports.com/imager/files/20210909231202.pdf
    • https://btsmstlucia.com/atomicsteps/upload/userfiles/file/62539280643.pdf
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16142647064960---xuwidigukaxikokulezid.pdf
    • http://sirindhorn.net/upload/File/moximit.pdf
    • http://alfavit.tv/userfiles/file/36532270205.pdf
    • http://hairandoil.com/uploads/18030773089.pdf
    • http://abwvictory.com/uploads/files/23613239001.pdf
    • http://jakpaisanestate.com/images/upload/files/xabesiroxudilizibe.pdf
    • http://chemonova.com/FCKeditor/file/serolo.pdf
    • https://www.scmsgroup.org/ckfinder/userfiles/files/takefuwipoz.pdf
    • https://suadienlanhhanoi.net/upload/files/zixotusokodokazovo.pdf
    • http://tygodnikzuzlowy.pl/ckfinder/userfiles/files/56381885959.pdf
    • http://castudio.eu/userfiles/files/35948035295.pdf
    • http://kleinschaden.expert/userfiles/file/vimujefapizi.pdf
    • http://wsp.pl/userfiles/file/95447674474.pdf
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/16151618bc08ab---davoramal.pdf
    • http://thecargonepal.com/userfiles/file/8029290872.pdf
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/6d74ef7d3bb7cf05fb2e33a3dffc00cd/75503307034.pdf
    • http://e68momo.com/shopadmin/upload/files/93587326750.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=android+apps+installed+but+not+showing
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b429.bin
4c0edc456c0927aa82708657d1d8aa4af3b7ba5cc57c693a5bf15d642f4993fb
pdf-font-stream PDF embedded font (sfnt) at offset 0xB429 17100 bytes
font_01_sfnt_off0000dfe6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDFE6 16792 bytes
font_02_sfnt_off0000f7fd.bin
4b8916d72cbcf331c052a83bd88ef74a3655d12a6753dd1deb6474ac78b66798
pdf-font-stream PDF embedded font (sfnt) at offset 0xF7FD 10976 bytes