Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b12cbf0a047d338…

MALICIOUS

PDF

90.8 KB Created: 2021-07-03 14:19:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e46d31160bd1a66c72974098db2733e7 SHA-1: 04e058a0a6304a81de5abe4d61879f5d04329187 SHA-256: 0b12cbf0a047d33827b80aca139368c35e64247f3ee9997ac9009e82648ae6c8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier with high confidence. It contains numerous links pointing to compromised WordPress upload directories and disposable hosting, forming a link farm. The presence of these links suggests an attempt to redirect users to malicious sites, likely for phishing or to download further malware. No scripts were extracted, but the structure and heuristics indicate a malicious intent to exploit user interaction via links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://irlanc.ru/uplcv?utm_term=movies+apps+for+android+tv PDF link annotation
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b52ab0e291d---75698682641.pdfIn PDF document text
    • http://atek-ent.com/upload/file/wurupedelotafaluwabo.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160aa9e7ed324e---dokagakoduvigowudata.pdfIn PDF document text
    • http://hublihorse.com/uploads/userfiles/files/35109830929.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16096e9c6e9b47---guxoragutu.pdfIn PDF document text
    • http://hzjksj.com/images/upload/File/tafujanirutigisewemepawi.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/0eba0014a88a4b09f581a67ae79313e8/jarodezomupazokipizogolij.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/vpdrkf6ata486gi70qturaoicp/likinedoluw.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608834f9bf2f8---xewuzenejil.pdfIn PDF document text
    • http://sergey-yushkov.com/pict/file/34230241354.pdfIn PDF document text
    • https://dusunceokulu.net/resimler/files/fokidot.pdfIn PDF document text
    • http://burfel.ru/upfiles/files/29676219314.pdfIn PDF document text
    • http://kiemtoanhaiphong.vn/upload/files/bokenesorufuwokirifatora.pdfIn PDF document text
    • http://skiflogistics.ru/userfiles/file/35282145062.pdfIn PDF document text
    • https://craftsmancuttingdies.com/wp-content/plugins/super-forms/uploads/php/files/33fcf3df36e3b9d5e2020620be6f1527/xujiwijavojeku.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078086558477---bemajol.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/7d823824d256485466b41be8e4da52a4/sunexitoxaxozakosujela.pdfIn PDF document text
    • http://mea-travel.pl/userfiles/file/giwiwepinagoz.pdfIn PDF document text
    • http://alfonsoguiggiarchitetto.it/userfiles/files/26370089454.pdfIn PDF document text
    • http://wami.cc/data/files/tumobuzakubopise.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/d7191208e7bac24da004d1e3909f156b/simazawimivuriluditeka.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607c0effc24f9---15658496653.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/ad6d97ph68ek2v5sdd146ubsa2/dojawe.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c988d501a78---bifufawug.pdfIn PDF document text
    • http://bwc.lt/i/92444888394.pdfIn PDF document text
    • http://crossfit28.com.s125853.gridserver.com/siteuploads/editorimg/file/papisewafilajemam.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_off00010095.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10095 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000118a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118A7 17468 bytes
SHA-256: 7251165d4bf2144a6084cdad05d78302213a0d217659157d2345b44890a1985d
font_02_sfnt_off000145bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145BB 10504 bytes
SHA-256: 62b059352be4f7750f3f21c8ed5168fabb8d9a468d6292d673b2028f33353a25

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