Malicious PDF — malware analysis report

Static analysis result for SHA-256 f31f1f38b16c9f10…

MALICIOUS

PDF

79.4 KB Created: 2021-09-01 04:21:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 042a7a7075535d3f7b0317f2d61feeb5 SHA-1: ad83042f86ae1a9f03e958ae88817e4950355c82 SHA-256: f31f1f38b16c9f104331796d37ac5584abb9bfdefafa19c33f2592f521512652
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised or disposable hosting, likely to manipulate search engine rankings or redirect users to malicious sites. The presence of external URIs and link farms on disposable hosting supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://infrive.ru/uplcv?utm_term=how+to+do+square+root+manually PDF link annotation
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/t8ohm9dld9utij6fjunr1ir7nd/kajalaxapure.pdfIn PDF document text
    • http://ash-graphy.com/userfiles/file/99108589228.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/0b539e195a4d6647113cf67f0123b627/pagamiwiwuvezu.pdfIn PDF document text
    • https://33mobility.net/uploads/files/foduneja.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/1608fdd44377e7---wegudadudonokutoja.pdfIn PDF document text
    • https://sportsslife.net/upload/ckfinder/files/75835059945.pdfIn PDF document text
    • https://urbanshapes.in/userfiles/file/87401795388.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/kqbciqsg4gijolurh09l99oo52/fepefomemadedak.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/694bb89f8ac19dfecc6e5c1bbfbdc91f/motunigepelozatoxepesato.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/54667287814.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080fa7a31ac8---63221512805.pdfIn PDF document text
    • https://www.sibirprokat.ru/ckfinder/userfiles/files/posupu.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/4202f57a78c30a6ef008c7f6715e1294/wifagenuruwepedarevu.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/80743d16edb141986e0a275dd10667a5/jumokefapud.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca3e8def596---62424474391.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/64cdac6b923a6cf43a37a3841dd59457/mezujikirajufivaxu.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d66676523b4---54375524767.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/93f108a16cdae2f510de56ece327bb98/lonubuwo.pdfIn PDF document text
    • http://ylpcl.com/ckfinder/userfiles/files/matokaliwilivipovegivebig.pdfIn PDF document text
    • http://quatangsongvan.com/hinhanh_fckeditor/file/lenixirorapumoxupito.pdfIn PDF document text
    • http://improntediteatro.it/userfiles/files/vitaroforudijeg.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_off0000cf56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF56 18140 bytes
SHA-256: 2b5e8630c9661af4f8d6b1564a7d633f5b8d5fabca4448568ea5d3de71c79a9b
font_01_sfnt_off0000fe61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE61 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011678.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11678 10752 bytes
SHA-256: 73d3910e63d7ee8fe1ad708dd21b1cc19174a37535798cbf73e89a6398628387

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