Malicious PDF — malware analysis report

Static analysis result for SHA-256 316ea7ac836466d4…

MALICIOUS

PDF

90.5 KB Created: 2021-08-11 06:36:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 6f4b266519672228c0494fedf6e5a2d5 SHA-1: 483b809c6a5d2f838188f7f3fbc7566edb76fa78 SHA-256: 316ea7ac836466d4446f34cae7bb55eb30f0682ee2f11e3f6394609a194ad42c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised CMS upload directories, suggesting a link farm for malware distribution or phishing. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body is heavily obfuscated and unreadable, but the presence of external URIs and compromised host links points to a tactic of directing users to malicious content, likely disguised as a game download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://hidropro.hu/upload/gupanixutufexububifud.pdf In PDF document text
    • http://briarcliff68.com/clients/71184/File/delan.pdfIn PDF document text
    • http://gwardiajuvenia.pl/zdjecia/fck/file/36489755783.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160746b6e47297---kedabuledodofejo.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1608b32b39d254---xefipomisotilapafibuxev.pdfIn PDF document text
    • http://kxnjl.com/userfiles/files/35405357853.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/16079956436aff---tezus.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/qkjglv3d8h4h96sj1fehmghk24/85899566072.pdfIn PDF document text
    • http://skogsformedling.se/bilder_umeny/File/dulonopidodad.pdfIn PDF document text
    • http://alphabodysupplements.com/newerac2c/userfiles/file/3410051774.pdfIn PDF document text
    • https://bajrahrs.com/userfiles/file/43725304343.pdfIn PDF document text
    • https://svarovanijelinek.cz/ckfinder/userfiles/files/vudexoxononepefajosisavol.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/09qfeo5hr2rrc74fd63aoares2/49279487768.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/29981553101.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/0c1b245ed55c8f2d9c791c5545fc08cd/28813951405.pdfIn PDF document text
    • http://pasaru.com/upload/files/muladabixagidoxez.pdfIn PDF document text
    • http://alternatifmedikal.com/img/userfiles/files/67255141282.pdfIn PDF document text
    • https://apoiotelecom.com/imagens/img_fckeditor/file/tusitawunetuka.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c48e931f90c---tejivuk.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/22e86c49bf5c6e3b555d297e537d9661/kogabafavomadikogud.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/8ae69b118874cae910b8160dc0f869c9/7647702179.pdfIn PDF document text
    • https://leciv.fr/uploads/FCK_files/file/45801082226.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=bus+simulator+ultimate+multiplayer+game+downloadPDF link annotation
    • 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_off0000fdd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDD6 11088 bytes
SHA-256: db582baf8c891d9413ad03af141787b12effe93951eccf32923ef60a32db9f1d
font_01_sfnt_off00011794.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11794 16840 bytes
SHA-256: feb64a8f83f115a18605c8486303035c2ed57227abe74d8e27a8f836d1929ae5
font_02_sfnt_off00014355.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14355 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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