Malicious PDF — malware analysis report

Static analysis result for SHA-256 98a10481722f1326…

MALICIOUS

PDF

97.7 KB Created: 2021-07-05 21:51:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 608ca9bd81d590a60ff4caf103f5a5a6 SHA-1: 6a0f7994d16c7e339079180a89f101ab74b8c59b SHA-256: 98a10481722f13266849b72cd1921a7d04197271fb8ed0ea4cb293d68ce5dbd0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains numerous external links, many pointing to compromised WordPress sites, suggesting a link farm or phishing lure. The presence of external URIs and the overall structure indicate an attempt to redirect the user to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9800

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 https://archism.ru/uplcv?utm_term=how+to+put+video+on+pdf PDF link annotation
    • https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/051cdbf18009c55b68293f515018032f/31662941991.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/90ff8f7d3574199247f5d724caabcd29/taxuwu.pdfIn PDF document text
    • https://soudurelausiere.ca/upload/editor/file/purazojedu.pdfIn PDF document text
    • https://marbellamohali.com/wp-content/plugins/super-forms/uploads/php/files/cedbe90af6f6190591ede2fe8e2a1a30/73251556118.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1c6a91eee7---wovumezotojedeputozas.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607242658d2b6---rurorelavele.pdfIn PDF document text
    • https://paperland.bg/uploads/file/levarazutawawuxoleranuler.pdfIn PDF document text
    • http://pogservice.ru/userfiles/file/diwidet.pdfIn PDF document text
    • https://producedepot.us/userfiles/files/giminonizevosix.pdfIn PDF document text
    • https://metricgroup.it/uploads/file/48369163877.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/7l14sq871aomlv6rva7dua2ah7/zexajosuxadaxox.pdfIn PDF document text
    • https://rubin2000-distribuitorshop.ro/userfiles/file/duwafapipujafoj.pdfIn PDF document text
    • https://bawwabatrizq.com/userfiles/file/taxebuloko.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/d4606bd3d6b61604382004a205970885/48011117743.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/49584d993c8e4424319d09280d291d05/98867919163.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/1107c23b60385bfb52d88e7674bab0e1/97724647574.pdfIn PDF document text
    • http://perlawarmii.pl/userfiles/file/febapad.pdfIn PDF document text
    • http://hncastlecable.com/d/files/31654726200.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160cb49c058df0---sojis.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609892a8e7151---49784512663.pdfIn PDF document text
    • http://chinajnbt.com/images/upload/File/natugerujulomimixozifon.pdfIn PDF document text
    • https://mamo-tato.ro/userfiles/file/xiwikegatokisononomak.pdfIn PDF document text
    • http://ed-web.cz/userfilesfile/98001436962.pdfIn PDF document text
    • http://ohsongpharm.com/ckfinder/userfiles/files/68830257994.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16078a3e59c800---60341599852.pdfIn PDF document text
    • http://citra.cl/userfiles/file/88353514675.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_off00011b1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B1F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013331.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13331 18204 bytes
SHA-256: a5f3fe196c368a0de7e832007828f371b4afd4ed19abba20f436301b39a3a18b
font_02_sfnt_off00016253.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16253 10260 bytes
SHA-256: 005772bd3d8fc6a2e1d4bd73dd9697abbaf2f4deb66c0315488d44c15e2bdb21

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