Malicious PDF — malware analysis report

Static analysis result for SHA-256 19bb69308396df37…

MALICIOUS

PDF

104.1 KB Created: 2021-06-27 09:55:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: b4e03ac159ca1cfdc59073a822bf9896 SHA-1: c17ab83b31707d2e6346d3923da0dffb67bf9176 SHA-256: 19bb69308396df3729a422a54b1f5c9dc895c49b2ead7b46ab7aca0c147fae0c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Multiple heuristics indicate the PDF contains a link farm pointing to various domains, some of which are hosted on compromised CMS upload storage. The 'SE_URGENCY_LURE' heuristic suggests the document's content attempts to create a false sense of urgency to prompt user interaction with the embedded links. No scripts were extracted, but the presence of numerous external links suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://wastran.ru/uplcv?utm_term=corporate+accounting+3rd+sem+syllabus PDF link annotation
    • http://agiusfuneraldirectors.com/files/file/40806261564.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/e98qkacc2dfidadhr2o6f1cv47/94672118823.pdfIn PDF document text
    • https://moveo-sport.pl/userfiles/file/48532425187.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160749b0b87987---gisegidev.pdfIn PDF document text
    • https://gute-reise.ru/i/files/files/84731538970.pdfIn PDF document text
    • http://lorichphoto.com/pictures/file/29182094890.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/ed278bee7d726d31cbd4a0606322b86a/jezik.pdfIn PDF document text
    • http://watthaistuttgart.de/userfiles/file/fovuxiwamugox.pdfIn PDF document text
    • http://goraku-sangyo.com/userfiles/file/1008042788.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/2cde72663f0fc23353d1dc0172df1531/79798462990.pdfIn PDF document text
    • http://orchid-daikanyama.com/userfiles/file/95637673196.pdfIn PDF document text
    • http://mottaing.eu/userfiles/files/17353520136.pdfIn PDF document text
    • http://whs1963.com/clients/7/75/758a827d59fb1c2827eec60421ffdc22/File/jawize.pdfIn PDF document text
    • http://ezibra.pl/upload//file/xafanebuvelujabutuvoteli.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/ponokuza.pdfIn PDF document text
    • http://gaziogluenerji.com/images_upload/files/visovefafafarap.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/56083925750.pdfIn PDF document text
    • http://gleneaglehoa.org/images/file/8751013859.pdfIn PDF document text
    • http://aep-tc.com/cache/fck_files/file/6326994533.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/70028608355.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/amlgit3sff22p92b7ld7c5pgh9/15304069029.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4cd3777228---wutoraluw.pdfIn PDF document text
    • http://altiro.nl/home/tjerk/file/17584341643.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

Related samples 8

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

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013439.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13439 11412 bytes
SHA-256: 16942e1315fcc301ee28dbcab4800cf62d439e2e16c402bb4996207e323b5930
font_01_sfnt_off00014ec2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14EC2 17088 bytes
SHA-256: 527c8d455628948b7bc61b2948579d75c4bcc860a531755e85325c8f1b6ce5e9
font_02_sfnt_off00017b3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17B3E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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