Malicious PDF — malware analysis report

Static analysis result for SHA-256 90160bedb8778f2a…

MALICIOUS

PDF

112.0 KB Created: 2021-07-20 13:10:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 03bce4f3c762b61e41b9b47e6fb415b0 SHA-1: f933a84cf88748cd479d1dc0877e76266d064d17 SHA-256: 90160bedb8778f2a0914cc076dcbf08ccf7d4995451f5fe3ddeaf49dfd3d8cb9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links pointing to compromised WordPress sites, indicating an attempt to redirect users to malicious content. The heuristic firings suggest this PDF is part of a link farm designed to obscure the true destination, likely for phishing or malware distribution. The presence of embedded JavaScript further supports the malicious intent, potentially for exploiting vulnerabilities or downloading additional payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/2106065b0ac7e3e40241e3f8fafe05af/9612283163.pdf In PDF document text
    • http://reicar.dk/userfiles/file/43120062186.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/20e71630b926042b4c409eb03f85dfd2/3268317584.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/rqf1vv3m9ot6srle3ls2s94004/fadufopimefilagid.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b8ab77c7f30---motaweduw.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ad2e0d7ece---39737638675.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab855deccf6---72343758712.pdfIn PDF document text
    • http://kzlo.pl/fotki/fotki/file/mupisuwokotazatarozip.pdfIn PDF document text
    • http://stevis.cz/files/file/52406363277.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606e7ec5a2f5d---tomiduvogofe.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608154c1601b0---zemufalu.pdfIn PDF document text
    • https://b2cexpressdemo.com/userfiles/file/jujixozaroro.pdfIn PDF document text
    • http://allasclub.com/campannas/file/16315090129.pdfIn PDF document text
    • https://soudurelauziere.com/upload/editor/file/43361337757.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/9178733799cb14182a2ab31d5c1b68b3/tixekaguzax.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/4a1994a8d2bbb6b619638ff227c22146/lekexojupikag.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/ej5smbec496ndkeht2udufdt62/80176584222.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1e9be59dc6---fuxerarepenelinivakeli.pdfIn PDF document text
    • http://everbeenmagnet.com/js/upfiles/files/49732326703.pdfIn PDF document text
    • http://preserveproperties.com/userfiles/files/lawole.pdfIn PDF document text
    • https://actor-conseil.com/files/file/22082346194.pdfIn PDF document text
    • http://agendatourvietnam.com/hinhanh/file/kukom.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c97189a5eff---346433563.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/2857059e437c21a2a33aa76624eabcb7/bufagikugadefa.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ddb7525e53---sekudowanurorekeferexova.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=word+for+two+words+combinedPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011f88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F88 18140 bytes
SHA-256: 114351234dbfdfd8727f6f58cca5306e060ab540e66dec6e154f78d061c9186f
font_01_sfnt_off00013c5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C5B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001546d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1546D 21032 bytes
SHA-256: ff7407fe28ab8b6f8e9ef4bc08050716281855f55777eb1c023818b92fb9f6fd
font_03_sfnt_off000189dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x189DC 10648 bytes
SHA-256: 6cc2b0de9f66282b02909606064e774c5a1983314a07124e1d9da70752215755
font_04_sfnt_off0001a248.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A248 6144 bytes
SHA-256: b7426bba7df1ef041eb3c8b22053b77923c6c52b05d8f494e9ad939df32ff1ad

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