Malicious PDF — malware analysis report

Static analysis result for SHA-256 10c5afa9bcc3812a…

MALICIOUS

PDF

87.4 KB Created: 2021-08-14 01:11:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7799cb28b03ae76c0a4aaedef48e5b1a SHA-1: 2c611e2b0aa442dc9c21df3a698f0c34d193d301 SHA-256: 10c5afa9bcc3812a8436f7d9196444aa8b95d89795e2fc0f7f227a042d0c6e45
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://on-video.com/movies/movie_data/file/4142273676.pdf In PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160759a382cb3c---bazisuwuvalanusojewu.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/c3432acbb8a4b0a5db90e51300f19340/61109531264.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160996e6d121a2---gutabigixa.pdfIn PDF document text
    • http://box8websites.com/ckfinder/userfiles/files/vaxabutixewa.pdfIn PDF document text
    • http://kotolantopeni.cz/file/temumizapogumoniwoliw.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e5e36931422---rojabosomalizuzezelezupu.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16087c730510b8---11340732732.pdfIn PDF document text
    • https://suadienlanhhanoi.net/upload/files/32426291788.pdfIn PDF document text
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/g3kj5lhgh0b4e6kfdis6r54ch4/15009369662.pdfIn PDF document text
    • http://autowassenindex.nl/images/uploads/35987763882.pdfIn PDF document text
    • http://gfzgt.ch/upload/file/vibuvagewesi.pdfIn PDF document text
    • http://cableesmaltado.com/d/files/23214003470.pdfIn PDF document text
    • http://vdavloeren.be/userfiles/files/79848011472.pdfIn PDF document text
    • https://edebmachine.com/images/media/files/wesusubamas.pdfIn PDF document text
    • https://internationallanguagenavigators.com/media/lulegumesoderub.pdfIn PDF document text
    • http://digivideos.net/ckfinder/userfiles/files/30588670960.pdfIn PDF document text
    • http://stylowa-pss.pl/userfiles/file/zapudoweloxiduwe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=motorcycle+shops+in+sacramento+californiaPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efe5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000107fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107FC 10852 bytes
SHA-256: a6f9df995e4472ceaa5f8c3a88098dc883f1e2983f0675e2fae5481b2861b0a7
font_02_sfnt_off000120eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120EB 18080 bytes
SHA-256: 1ef6607eacdc5356d0f07b1bfbf79081c1e179c439f10b18b45e6a0277037a4c

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