Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c1251283ec4607e…

MALICIOUS

PDF

79.7 KB Created: 2021-09-15 20:52:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 81c8c7e1a3baa8591a82e2495df56270 SHA-1: 286a16d4d334e3db5590cb7b645b023b9e619479 SHA-256: 7c1251283ec4607e15333d5ba1a67c3a453d6d39373fe460560ec0c935b48912
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links to external URLs, many of which point to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_RANDOM_URL_LINK and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates a pattern of distributing malware or phishing lures through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 https://garglob.ru/uplcv?utm_term=the+walking+dead+knots+untie PDF link annotation
    • http://donovaly-ubytovanie-safran.sk/web/userfiles/file/91444678968.pdfIn PDF document text
    • https://karapinarinsaat.net/userfiles/upload/file/bexufeposikipikuda.pdfIn PDF document text
    • http://net-work.cz/data/file/79661612905.pdfIn PDF document text
    • http://resurrection-life.net/userfiles/files/56677025124.pdfIn PDF document text
    • http://agierresrl.it/userfiles/files/dunuguwewajitez.pdfIn PDF document text
    • http://xn--e42bt3l.net/upfile/files/xipagojosuduxaziki.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/16132f699650e5---fupomimu.pdfIn PDF document text
    • https://spa-salon.ru/ckfinder/userfiles/files/61137877803.pdfIn PDF document text
    • http://ouhkpthaa.org/userfiles/49526749599.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131a16803868---57471237525.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135e43e2b3ae---39227961276.pdfIn PDF document text
    • http://enovosti.info/ckfinder/userfiles/files/60144162698.pdfIn PDF document text
    • https://mimpidia.com/contents/files/32220093534.pdfIn PDF document text
    • http://veterinarioassociatopacinidallatorre.eu/userfiles/files/jopunagavusuxomu.pdfIn PDF document text
    • http://grawerlik.pl/userfiles/file/93925585751.pdfIn PDF document text
    • https://pasationtravellers.com/root/FCKeditor/file/pugobagiba.pdfIn PDF document text
    • http://chanhungcorp.com/images/uploads/files/4978643948.pdfIn PDF document text
    • https://minhgianggroup.vn/upload/files/dokafadaforozediduge.pdfIn PDF document text
    • http://nirmalapublicschoolerumely.com/userfiles/file/50836197554.pdfIn PDF document text
    • http://szolnokepul.hu/userfiles/file/53178772612.pdfIn PDF document text
    • http://grupopiscis.com/upload/files/6902789816.pdfIn PDF document text
    • http://j-club.eu/userfiles/file/29112439852.pdfIn PDF document text
    • https://rusepress.com/uploads/wysiwyg/files/66753126514.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d28e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD28E 18048 bytes
SHA-256: c39f687432470993c84e940cf5d94cec1ca289ace0aedbbf8ed6b8bffac20d25
font_01_sfnt_off00010138.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10138 10668 bytes
SHA-256: fe8e6c125b46f84048836fd93036bd76ebf6259b9f74f21c9afb058ec3053321
font_02_sfnt_off00011979.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11979 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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