Malicious PDF — malware analysis report

Static analysis result for SHA-256 775a597d21b4aca9…

MALICIOUS

PDF

83.2 KB Created: 2021-07-26 03:14:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: d0220a18b902e4a038a0893e8e903c01 SHA-1: 734e543fe569823b9d26c66014e06a85d3b03ffc SHA-256: 775a597d21b4aca962fbe88cc9f67253eb4004f87fb3f7a610238266def16356
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is unreadable, but the presence of external URI heuristics and link farm indicators strongly suggests an attempt to lure users to attacker-controlled infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9416

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 http://charugarware.com/DEVELOPMENT/charu_garware/uploaded/userfiles/file/27128699461.pdf In PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/02fa626afb89c6f9478d7cc9eea7b696/28226620288.pdfIn PDF document text
    • http://tgtech-auto.com/userfiles/file/nekirapun.pdfIn PDF document text
    • http://nena-artspace.com/ckfinder/userfiles/files/fapodevugowu.pdfIn PDF document text
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/d50c5f075b67538e303a5b212f155a6b/97999331593.pdfIn PDF document text
    • http://forresterfamilyreunion.com/clients/c/cc/cc72bfd2512333311cc1ef5a4fdef90f/File/35088968912.pdfIn PDF document text
    • https://store-connector.com/_upload_bilder/_filemanager/file/roziraxarapeken.pdfIn PDF document text
    • http://muntepa.com/userfiles/files/236216165.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/98073718235.pdfIn PDF document text
    • https://cytairtool.com/test/userfiles/file/20210726_9b3b2.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095f53308c75---32352603162.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/pak4s2oegh2s20ig3f6c1krlh3/fibelogasukuvenoguromo.pdfIn PDF document text
    • https://cecprint.com/images/file/24376952243.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160960166cf2a5---sofik.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c51e4869a27---60720677045.pdfIn PDF document text
    • http://sgpeo.pl/users//file/kesiwupetolejulixesu.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/7a8c610c801296b864120f6a920ee245/46233585439.pdfIn PDF document text
    • http://bjjiffy.com/upload/tafipititurituxesolid.pdfIn PDF document text
    • https://www.reachcast.ca/wp-content/plugins/super-forms/uploads/php/files/654ab9713cac9e20c0d1a01bb0aa3983/44580436384.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160f95a9199c27---96131692639.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/ed673d851e374988afcefc2a5928c325/29525132504.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/0a12d7827dd9c1b67840f8116c197f24/88135606624.pdfIn PDF document text
    • http://studiofranzoni.eu/userfiles/files/fubuxemetojov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=calistenia+en+casa+pdfPDF link annotation
    • 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_off0000e99f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE99F 10424 bytes
SHA-256: 8f3ec972c95c022047b631307b4510541735ee1b360b286bcab5e34d24c978aa
font_01_sfnt_off0001015c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1015C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001196e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1196E 17340 bytes
SHA-256: 9dd9930754f0a56e07e94a224639b10a0f3746ea81597a43ef3c5a317f1c031d

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