Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a22531056b6e881…

MALICIOUS

PDF

90.9 KB Created: 2021-08-22 05:31:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2435e873b668d785bc07aa61d2e9e301 SHA-1: 8fb382bdd2fc9c248685d95dde3ad251c40fc2b9 SHA-256: 8a22531056b6e8812e239a8855a5f0d5e44e7ac6ebde1ca85ce75a61be56fdcc
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous embedded URLs and link farm indicators suggest the primary purpose is to redirect users to potentially malicious websites. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure points to a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://smidgel.ru/uplcv?utm_term=como+hablar+con+un+progre+pdf+completo PDF link annotation
    • http://nfraccon.org/userfiles/file/30014707066.pdfIn PDF document text
    • http://uptownherndon.com/uploads/files/88618418703.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160af9af70327a---19174688066.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-5-1/20210501072934270218.pdfIn PDF document text
    • https://centrosteadycam.it/wp-content/plugins/super-forms/uploads/php/files/a89307fcc23c8d015f3f3119866ee5c0/nitotiso.pdfIn PDF document text
    • http://villaelen.it/userfiles/files/kixosubi.pdfIn PDF document text
    • http://bishnutoursandtravels.in/userfiles/file/jilizalamorivut.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3160d2631c---65186925004.pdfIn PDF document text
    • https://soechi.com/userfiles/file/64782804728.pdfIn PDF document text
    • https://ehbo-oostkapelle.nl/userfiles/file/55907962616.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/a5a1cf482fe0c92f779e48ac8589639a/5350699682.pdfIn PDF document text
    • http://springbook.no/files/62499798936.pdfIn PDF document text
    • http://wingprocess.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gexukifo.pdfIn PDF document text
    • https://emprenderem.cl/files/sosogukixepumomaser.pdfIn PDF document text
    • http://msinziniering.com/userfiles/file/resuziwategudonu.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce268de0f6d---mamokofixedetitidapukiku.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/u3tkdpdkojmo7e0gkcnt3sdmv0/51617231972.pdfIn PDF document text
    • https://nadamasristorante.it/file/sovuwewipekowigana.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609fd5383e33b---kojavetasugix.pdfIn PDF document text
    • https://network-italia.it/file/89136921406.pdfIn PDF document text
    • http://makingtheturngolf.com/clients/9/92/925d9bae4ecf380f28dbe0e1390c16eb/File/seratog.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a244f494cd2---jigojifufipojuw.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/97010996304.pdfIn PDF document text
    • http://cartopack.com/Images/file/50584521751.pdfIn PDF document text
    • http://studiotecnicopetrillo.eu/userfiles/files/sujaporazuzes.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_off0000fafe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAFE 11076 bytes
SHA-256: ea9d0113a8d5f1619b73ea40f42defb46105b246a08a32e8996f9b0b1b01c8ea
font_01_sfnt_off0001143c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1143C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012c4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C4E 18828 bytes
SHA-256: 2f63f9789ce0f940544672e09826e795530a61603dcadba48ac1cc5cbc6a6421

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