Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9341fe79561255d…

MALICIOUS

PDF

77.2 KB Created: 2021-07-01 23:52:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e06f5f6e119e934cd4265c859bcf873f SHA-1: 773b68eb215fbc5e11eaba595686c8f1e9fbafc8 SHA-256: b9341fe79561255d5b127567fde594e44bffc16760141a2e06e73d73854fdd1e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier. Heuristics indicate it functions as a link farm hosted on compromised CMS upload directories, with multiple distinct domains hosting PDF files. The PDF itself contains obfuscated content, but the overall structure and URL patterns suggest a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160949d807aa5f---pipoxegurixigegebe.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160792866b8791---jazitanoxewowugirepu.pdf
    • http://stellamaris.cz/userfiles/nuronunovakis.pdf
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b4bff57d223---93419269087.pdf
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/995c4de9dff24c5627f118dc0b4616ee/78919048492.pdf
    • http://inwallendorf.de/userfiles/file/rifapudimaz.pdf
    • https://www.ideaklinikbursa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082d15eaf938---vovovilewenapa.pdf
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608beaaceaf70---69551780314.pdf
    • https://tranduongauto.com/app/webroot/files/images/pages/files/wukipemumadaxitofiga.pdf
    • http://coreaad.com/DreamDataUpload/file/dejerezatowoxojilasupi.pdf
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1608b998b7156e---funoxerixukul.pdf
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/06cd052e0106ea96a88c193f37c22d3c/mijor.pdf
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160703ffac0d92---jifenufomulilubixajutu.pdf
    • http://sbox-technology.com/upload/datoteke/supojusubiwodurajafoge.pdf
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/q3ddf4mptuoenfsucr58ieifc7/38929840737.pdf
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160bbe3dc443e6---keduguva.pdf
    • https://partnyor.az/userfiles/file/54875317614.pdf
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d9dd3e43cf---63870524440.pdf
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608bc0a13a710---55566336776.pdf
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/144f110b512b712a0540cec9b119c234/turagimezuwiduxeviforit.pdf
    • https://biothiennam.com/media/ftp/file/41053683969.pdf
    • http://mp-hd.de/data/aktualnosci_imgs/file/tebemot.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=kaaba+in+which+direction
    • 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_off0000cc7e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCC7E 16792 bytes
font_01_sfnt_off0000e490.bin
7a6dccac151d4c782f8e0dce036358fc4fb65e8c8c5570c1ac32f416becd0724
pdf-font-stream PDF embedded font (sfnt) at offset 0xE490 16688 bytes
font_02_sfnt_off0001101a.bin
d1985c0b4bb50584fa36d9baa154ba5b50888706a159d45ba2af25dfcddd606a
pdf-font-stream PDF embedded font (sfnt) at offset 0x1101A 10468 bytes