Malicious PDF — malware analysis report

Static analysis result for SHA-256 8347d0b952a658a8…

MALICIOUS

PDF

82.5 KB Created: 2021-08-10 08:11:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7fda3c2c90a4a20af9d799556d8ee346 SHA-1: 64a9663e5e7d66664fc856c9e81a33e8c10f941f SHA-256: 8347d0b952a658a8ff26aee99d8937b1b2db049d66ccb72661e36b92a31aabfc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. The file contains numerous external URIs and is identified as a link farm, with many links pointing to compromised CMS upload storage. The presence of these links suggests an attempt to redirect users to malicious sites for phishing or malware distribution. No scripts were extracted from this sample, but the overall structure and URL patterns are indicative of a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://crewmak.ru/uplcv?utm_term=conjunctions+worksheet+grade+4 PDF link annotation
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/eiqh2psdfasocbr376g2v2q1t3/73213255311.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/rhj6oadj8468qg43hlt7gm9klh/lilurasotakape.pdfIn PDF document text
    • https://mvservice.it/file/25641903878.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/mununijuguvutesokoxe.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/747bfc22e08c4c29f763034030f788ec/xiriv.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/ed0da46e581fc4b9adabe8c8d47e14ad/mabizajowozol.pdfIn PDF document text
    • https://kuepancong.com/contents//files/85514147704.pdfIn PDF document text
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/k879l0kj19ij58sgb79ku2ipdi/dujolawutibikel.pdfIn PDF document text
    • https://tekmaker.com/upload/files/93746387333.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bceea16049---53742543853.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/b77b4d20caf7b721a80d9966f77656f2/zijad.pdfIn PDF document text
    • http://bearings-home.com/userfiles/file/lofaxusolimapiv.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1609d408a58cca---jegiziwesorimok.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/pohv46cuabd0dp65eagbiuvbql/fitokefavuv.pdfIn PDF document text
    • http://emilygrilltogo.com/uploads/files/58978757219.pdfIn PDF document text
    • http://mellorymotors.ru/admin/ckfinder/userfiles/files/gudaxujuvesukagifosep.pdfIn PDF document text
    • https://tepihtrava.rs//files/silavevaluxin.pdfIn PDF document text
    • http://xn--80aab8aioy.xn--p1ai/userfiles/file/betasima.pdfIn PDF document text
    • http://noxsun.com/jingkelun/userfiles/files/20210603110303.pdfIn PDF document text
    • http://kapsalonvogue.nl/files/file/xuditixuxaralib.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609b32eaee006---povolijamafo.pdfIn PDF document text
    • https://dazhonghua1688.com/ckfinder/userfiles/files/dalev.pdfIn PDF document text
    • http://ersenergy.com/UserFiles/file/95165038563.pdfIn PDF document text
    • https://istanbulbalbir.com/upload/ckfinder/files/bifijewetabatuvukataze.pdfIn PDF document text
    • 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_off0000de0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE0E 11120 bytes
SHA-256: 1ce57e00d067825aebbe71410fb4179bd647ff609bb86ec9a0e7f4ed2b4ddb75
font_01_sfnt_off0000f7df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7DF 17136 bytes
SHA-256: a248f06ae13b89fe41f428da84bf0c507ea3f3081731b7e9e3a8307da737cdcc
font_02_sfnt_off0001241e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1241E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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