Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0e36fb5771f693a…

MALICIOUS

PDF

78.7 KB Created: 2021-08-24 20:09:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 02fa836e2b039ae6e46c1ea7da21fb05 SHA-1: a53f4f5cbe7ca4eff1ff8f71ab6a7b96694671b6 SHA-256: f0e36fb5771f693a9725b8c50cc76c2d109585609d632e107f33e55da073c4c2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and are structured as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://synerhu.ru/uplcv?utm_term=what+state+is+area+code+210 PDF link annotation
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/c83ea4e515416b3bf982e77a81dc1095/gikevemabudon.pdfIn PDF document text
    • http://cck-brno.cz/ckfinder/userfiles/files/tezaxadigaboxid.pdfIn PDF document text
    • http://meta-min.com/files/38845964613.pdfIn PDF document text
    • http://liccuza.ro/stiri_files/file/xewiwirova.pdfIn PDF document text
    • http://co-mit.com/uploads/files/75876955160.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/wamifabuganoxapekefejotus.pdfIn PDF document text
    • http://gtshotel.it/images/file/jijitigeretanupov.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d9a3173b49---japoxiludolapika.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/o0noboprren1n4m0v45sap4bl6/vawalubilidudegexu.pdfIn PDF document text
    • http://filippodelvita.com/demo/userfiles/file/78055885315.pdfIn PDF document text
    • http://hzjksj.com/images/upload/File/vokixogu.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3ece405423---2372573074.pdfIn PDF document text
    • http://joyearland.com/ckfinder/userfiles/files/14309212159.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1611a960403cf6---19139711312.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1608fc6a5b2704---rumapexowelerixufegogerag.pdfIn PDF document text
    • https://hardlineconstruct.ro/app/webroot/files/userfiles/files/15174319960.pdfIn PDF document text
    • http://nexxosrealty.com/userfiles/files/jixilej.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608aaebf14160---wevakop.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afc2e6b5b09---dezumagero.pdfIn PDF document text
    • http://emannsltd.com/userfiles/3219993526.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609e82b95742f---keboxigefebekenunetirova.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/a0ee8ce98305a7ab031c745f85ad3f4b/zutozagaduwivevawoxabe.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/579tsvnm7ppqii41v6t104d590/92746020123.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_off0000d3c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3C1 10604 bytes
SHA-256: b6fda9581a9d3e9a692368310a971612d6f9dbd6aa8fa8225a4890c0c553d959
font_01_sfnt_off0000ec43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC43 16040 bytes
SHA-256: 3f448721e8bf1b8bd85cd0c17afb894ba9faedeb053a653ad88013f1fb46451b
font_02_sfnt_off0001154d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1154D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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