Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbcb78333f854626…

MALICIOUS

PDF

100.1 KB Created: 2021-08-07 16:41:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 21bc3699ce036d7fdd6f05cfa725cd0e SHA-1: 2a862c5d70d2db5cd13df15c2e175af153812239 SHA-256: cbcb78333f8546265531d7e6121d13781a60062b81280d4dbf00195ca0b133fb
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.001 Process Injection

The PDF contains numerous embedded URLs, many of which point to compromised WordPress upload directories, suggesting a phishing or redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7382

Heuristics 5

  • 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
  • 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://wastran.ru/uplcv?utm_term=applied+practice+in+the+scarlet+letter+answers PDF link annotation
    • http://reafamily.lt/ckfinder/userfiles/files/69270806546.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b093863d529---mosoxazukozosewulawer.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/miwikozane.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160824b031f93a---21654821204.pdfIn PDF document text
    • http://maivietnamesecotati.com/uploads/files/20061665108.pdfIn PDF document text
    • http://kirilmazbardak.com/userfiles/file/jisoraninewapozuvi.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/bea37e4120d996081a53cf680cbdab97/66985811830.pdfIn PDF document text
    • http://sun-eko.eu/files/file/pogatajajedo.pdfIn PDF document text
    • https://mytalk7.com/_UploadFile/Images/file/3338474129.pdfIn PDF document text
    • http://cellesekorea.com/ckupload/files/99476873850.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/27437d2547b3364fbab7378069f0fdc9/36476338509.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608808a886c3e---taxenamonago.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ae76cc2171---zorakakovokitekozebuvorax.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/57f0vb276o38ckjrvffbtcso1s/4029572720.pdfIn PDF document text
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/d1c7b43284df34c6d3107b97b31ec541/kenadadime.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c1e05d7f4b1---domegetepor.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608091ec6fb1d---wejaxiregekefubufeweku.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/bd9ae699b608352eac0f0b5b66b0ffa3/35524419001.pdfIn PDF document text
    • https://simon-daulte.com/ckfinder/userfiles/files/dagewetugoluz.pdfIn PDF document text
    • https://telechips.com/ckfinder/userfiles/files/23582003083.pdfIn PDF document text
    • https://avonsteel.com/UserFiles/file/25634525064.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00016b46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16B46 10560 bytes
SHA-256: 01b224f6dbd93f807c33eea2d614e681e5eb4828eea26a3a1d8bbd5d46b06aff

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