Malicious PDF — malware analysis report

Static analysis result for SHA-256 141d4535555b7568…

MALICIOUS

PDF

86.3 KB Created: 2021-06-29 08:11:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2f85d928800a3c9c12d34af470f0e918 SHA-1: 1f30316e7c75e5eab32dbbe29883981c4f203341 SHA-256: 141d4535555b756833615fc1a5913040e3c8ad173f3d53b7c5205f110ea747d7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting an attempt to redirect users to malicious content. The document body was unreadable, but the presence of numerous unknown URLs strongly supports a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160756a6eb5474---99276919839.pdf
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/bf96b7766b01955e150bdeab60f0181b/46690303004.pdf
    • http://beiks.info/public/file/9547840692.pdf
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/6bd7b397ae1febbd67b9981f31c88ef0/tifiperodogaj.pdf
    • http://eperon-kochersberg.com/img_db/nizogolapubexo.pdf
    • http://www.makattakasinti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077ca5e91c28---bakigokapidoli.pdf
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160817f1887ee1---giraka.pdf
    • http://1utilaje.ro/mm/file/85791403210.pdf
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607c0e5f62685---88197228245.pdf
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcf4f4e2c20---67646538496.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c07c436e61---53645659607.pdf
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c09cb0a0bde---9966391369.pdf
    • http://aiswaryamatrimonials.com/fck_uploads/file/37299514905.pdf
    • http://bogelaipigeon.com/upload/file/duzilamojewerega.pdf
    • http://luvnchrlysenglishtoys.com/clients/861429/File/bafejerimuwav.pdf
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607f79ec9f5ec---zebepeximibomajokoxipibef.pdf
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccaa664441---8674863005.pdf
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16082f69d9cf1c---saguxiraneve.pdf
    • https://jxloanchien.com/style/postimage/file/rasuzigolusifotinureki.pdf
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/7b3mosb2mv94sqb1s8tv87r1e4/35067057866.pdf
    • https://binarbaidservices.com/public_html/userfiles/file/fanis.pdf
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adc516952bb---8132990845.pdf
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c50a43904c4---7678783902.pdf
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/a6b01eb44504b1d43771ad15d7732f12/fasawamifizefapolu.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=britney+spears+give+me+give+me
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ecff.bin
5bb248f7b295b8eec70aa0ff9ec7b6bd47f572dc4fb6c2cdb6d32742bb078ae1
pdf-font-stream PDF embedded font (sfnt) at offset 0xECFF 17556 bytes
font_01_sfnt_off00011b3e.bin
ea5d6bcaccf3f45ffd23e187222dff9f0243820642552eb8f0a3ed2d4885a9fb
pdf-font-stream PDF embedded font (sfnt) at offset 0x11B3E 10660 bytes
font_02_sfnt_off000133c1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x133C1 16792 bytes