Malicious PDF — malware analysis report

Static analysis result for SHA-256 81d7c4fd5d8c4fbf…

MALICIOUS

PDF

80.5 KB Created: 2021-06-27 20:48:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8d48b95a4d1c93ed85653473a373ba40 SHA-1: e2dfbed5a3f2bbbcdb35f4c8941084abbc3f0165 SHA-256: 81d7c4fd5d8c4fbfc6fda0404340882929d3f55b6d326ab630b923f36cb42343
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 http://nusratali.com/userfiles/files/53469748594.pdf
    • http://jjmcp.jp/userfiles/Image/file/84109276931.pdf
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609494fe082b1---lamemiwitowigegabemosinon.pdf
    • http://ccswcd.com/userfiles/file/lafiporejigu.pdf
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cfe8f46c9e---tikumufozigetajijobizipeg.pdf
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/brn3g5u0u1dt6s018kepbl8kkv/1675369158.pdf
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160c369ca62c84---nevodowokijuwis.pdf
    • http://gruppocinofilomarsalese.com/userfiles/files/lipodojon.pdf
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160be4718cb246---49642165229.pdf
    • https://foxtailmag.net/wp-content/plugins/super-forms/uploads/php/files/33fd19c95e6b5d0548d51ba9d383dde4/47477482739.pdf
    • http://auksozvynas.lt/userfiles/file/xagopokedibekatovab.pdf
    • https://soudurelauziere.com/upload/editor/file/41154586511.pdf
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/bj44a94fgv6p0pr80vtd3sg67u/jaxaxow.pdf
    • https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/3mli1ufopqfnu8qrcev4tn2jut/sofixuzojaso.pdf
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/2257ed916e01c7ea5fb51bf3da1b6f13/bimigexokogefukulexavage.pdf
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/4652f0bceb177df55b6384c41ec4a091/80635200157.pdf
    • http://merlegdoktor.hu/tmp/fomejofonipi.pdf
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac5c472b1ed---wofujane.pdf
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/ebd0094e3ba7ce523a877c8a44da4358/rabisutolusirol.pdf
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/4p2vbs6fk0kn4sgdafat58qnia/3643764673.pdf
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/160b71ec087240---wabuw.pdf
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/jdcgemf3lcst9snotl12894i13/befegaxepiwejowurila.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=free+online+porn+games+without+sign+up
    • 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_off0000d7a7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD7A7 16792 bytes
font_01_sfnt_off0000efbe.bin
677bf4d29c00fc96d02067491b466bcdeafec4449d553f15cbcf6b5f70dbe515
pdf-font-stream PDF embedded font (sfnt) at offset 0xEFBE 10864 bytes
font_02_sfnt_off000108a7.bin
6ac2b4da1e669829189cd2cfacd0d8cad5bfd73034bb5d1d1deba3681c4c5e27
pdf-font-stream PDF embedded font (sfnt) at offset 0x108A7 17076 bytes