Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c0a06298e79654b…

MALICIOUS

PDF

66.4 KB Created: 2021-09-27 07:46:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 649ce5ec91f9794eda30eee5e252713f SHA-1: 8939ba6982567bfff87ea59198d30b53c33dfaef SHA-256: 6c0a06298e79654b1b6f33db82529114ec2311eb7e23f02e1a9586579d1e0ca6
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as a phishing lure due to its small size and image-only content, typical of a screenshot designed to hide clickable links. Multiple heuristics indicate it functions as a link farm, directing users to various external domains, including compromised CMS uploads. The presence of numerous URLs, many pointing to disposable hosting or WordPress upload directories, strongly suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5472

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 66 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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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=do+not+disturb+android+auto PDF link annotation
    • http://statsale.com/data/upload/ck/files/7507879059.pdfIn PDF document text
    • https://pristineleather.com/userfiles/file/zubasudapi.pdfIn PDF document text
    • http://kiddeefire.com/media/userfiles/files/48363993987.pdfIn PDF document text
    • http://bhavalaya.org/ckfinder/userfiles/files/95713442987.pdfIn PDF document text
    • https://telechips.com/ckfinder/userfiles/files/lizafojudovakibipe.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/0d20071e994f975472d447f6883b7203/duzosanororujoragebuzi.pdfIn PDF document text
    • http://hsi-international.com/ckfinder/userfiles/files/dasudotekeledudiza.pdfIn PDF document text
    • https://polnische-zaune.de/userfiles/file/44064319408.pdfIn PDF document text
    • https://wietsevoermans.nl/ckfinder/userfiles/files/68576131150.pdfIn PDF document text
    • https://honkakuji.jp/honkakuji/images/ckfinder/files/sixipozuwo.pdfIn PDF document text
    • https://mannoorpally.com/uploads/file/duxuje.pdfIn PDF document text
    • http://www.heatandgas.com/EditorImages/file/zugosarasiwikusomaguvese.pdfIn PDF document text
    • https://asoriofrio.org/ckfinder/userfiles/files/wilimeb.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133c4c3af991---37555594917.pdfIn PDF document text
    • https://ipssecurityconsultants.com/ckfinder/userfiles/files/98844114418.pdfIn PDF document text
    • https://leciv.fr/uploads/FCK_files/file/11028956515.pdfIn PDF document text
    • https://birsamundapark.in/userfiles/files/50403274958.pdfIn PDF document text
    • http://stefanourso.com/public/userfiles/file/galiwanemak.pdfIn PDF document text
    • http://hrampetraipavlavosstanovlenie.ru/content/images/user/file/46878941844.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147538f4aed4---54304631933.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b5aceab8bf---kuberezazoju.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/zelomafoviwipesesupun.pdfIn PDF document text
    • http://hoangminhceramics.com/app/webroot/uploads/files/84511682286.pdfIn PDF document text
    • http://1mosref.ru/ckfinder/userfiles/files/giwijavewina.pdfIn PDF document text
    • http://cabinet-blin.fr/ressource/site-image/files/jedipenajarala.pdfIn PDF document text
    • https://batdongsandothanh.vn/luutru/files/98814534166.pdfIn 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_off0000b643.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB643 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ce55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE55 14180 bytes
SHA-256: 32355e92d27f2819f16b5451449d659313260da04794ad2b3f91d331562fd274
font_02_sfnt_off0000f1a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A1 10304 bytes
SHA-256: ab547cab80962e54e1ac91f5bb20e55310e1f4e3658f9d435dd392a7fa40daab

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