Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e672f5ba940c758…

MALICIOUS

PDF

91.3 KB Created: 2021-07-14 03:41:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 76af3156ccfe00b12fccdb887f4e7695 SHA-1: 92dcf411fd915a9ce68c11bd8d0684c2fd35f9d2 SHA-256: 4e672f5ba940c758121088c7ea1fef781075c0c76f657a7cbfe68f05f4e63593
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as a phishing trojan and a machine learning classifier indicated a high probability of maliciousness. It contains a link farm pointing to numerous external URLs, many hosted on compromised WordPress sites or disposable domains, suggesting an attempt to distribute malicious content or phish for credentials. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

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://ackerviewguesthouse.com/userfiles/file/8016899360.pdf In PDF document text
    • http://hotstamping.pl/files/file/53356641140.pdfIn PDF document text
    • https://gw21.ch/uploads/userfiles/file/65790079827.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/5979f63eeda6e9cd85e6235bf4fac695/37564152794.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/5a2e9dd9615f7e70cd88d38370aa2664/josebufamujixibipaxadere.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/2eq74ns8ajfcc6dfshlukb416i/75528313781.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608eca969ebd9---37647167822.pdfIn PDF document text
    • http://elementsgogreen.com/userfiles/file/genizonobirinimejutejulo.pdfIn PDF document text
    • https://artenika.pl/fck/file/kojuwipotosevubibe.pdfIn PDF document text
    • https://miaousland.fr/ckfinder/userfiles/files/4983705884.pdfIn PDF document text
    • http://sisparts.pl/zdjecia/fck/file/13277394938.pdfIn PDF document text
    • https://dobre-akce.cz/media/files/file/37305651938.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160c42927e8cd8---84463756461.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/32074397109.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607b4d938c4e9---vufopalobavu.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b5dd09d8946---tubin.pdfIn PDF document text
    • http://thomasbelldescendants.com/clients/40432/File/vutemewogewalon.pdfIn PDF document text
    • http://bean2beenefamilytree.com/clients/60578/File/fijamum.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160906d1bd9660---15178990425.pdfIn PDF document text
    • https://schilderlesvakantie.nl/ckfinder/userfiles/files/tofuligelosinotafemeji.pdfIn PDF document text
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160834bd30aedd---dagefekus.pdfIn PDF document text
    • http://sam-global.info/files/file/80957298871.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/239a447474c569c133f69c7fb7ea49e1/61558609912.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=rock+the+casbah+remasteredPDF link annotation
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off0000e5df.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xE5DF 17508 bytes
SHA-256: 36837138ad702327c63c252a545202a4b86fc7b1e842f5487f08d9e32765d2ef
font_01_sfnt_off00010050.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10050 10668 bytes
SHA-256: 091f9046e4334fdde8d455a633a6951dac9730c699a67f627c247d1bbe5268c4
font_02_sfnt_off000118d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000130e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130E8 18320 bytes
SHA-256: e1b099b4c147e931f2c322e5323c55d55dc6e6e28483e76db25169634bf97405

Open this report in the interactive analyzer, or submit your own file for analysis.