Malicious PDF — malware analysis report

Static analysis result for SHA-256 a36e8f9057dec8c8…

MALICIOUS

PDF

101.5 KB Created: 2021-09-08 11:00:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 132b30b7bf0a17e518356297d2f23f11 SHA-1: 70d021b1dca44c6ef1de5d14f5f1526d2939aa1e SHA-256: a36e8f9057dec8c8bb3a6951cb941a64210e71085c1b5c2ffbbddbcfc0aef89d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It functions as a link farm, directing users to numerous compromised websites and disposable hosting domains, likely for phishing or malware distribution. The document body is heavily obfuscated and unreadable, suggesting it is not intended for direct user interaction but rather to facilitate the redirection to malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://nomylo.ru/uplcv?utm_term=apparel+manufacturing+technology+book+pdf PDF link annotation
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/4a1221e40eaf51369932a6153df1da8c/kunurerezikemoruvajuwin.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e188a957410---sowanis.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca2d93c374---26458840863.pdfIn PDF document text
    • http://amsasecretariat.fr/userfiles/file/tolijanitavivumusozozoj.pdfIn PDF document text
    • http://reklama-v-sochi.com/ckfinder/userfiles/files/parebawujerel.pdfIn PDF document text
    • http://suacuacuonthanhhoa.com/upload/files/98517819070.pdfIn PDF document text
    • http://altinay-law.com/images/file/xerefirepawas.pdfIn PDF document text
    • https://gionggiacam.com/ckfinder/userfiles/files/tapesarunatogovututivoka.pdfIn PDF document text
    • http://mentaplywood.com/images_upload/files/41343564454.pdfIn PDF document text
    • https://gencshow.com/upload/ckfinder/files/zaweli.pdfIn PDF document text
    • http://chono.mn/uploads/userfiles/files/93129074596.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/t44vj77hrat2f6qso6bsgppuv6/44723018208.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/e9590d338cac656d9337c48b6b65aa59/75029014473.pdfIn PDF document text
    • http://chukysovin.com/img-svc/files/tafobavalerezaz.pdfIn PDF document text
    • http://metisentry.net/ckfinder/userfiles/files/ratubuzokakesaberodaw.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609896a768c84---pinizigugujepugar.pdfIn PDF document text
    • https://auto826.com/uploads/files/78161109617.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/mawekubopukon.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608f20a0cc068---forateb.pdfIn PDF document text
    • http://embeddedhr.com/ckfinder/userfiles/files/xigefotoxuvuxa.pdfIn PDF document text
    • http://csa.china-led.net/static/editor/ckeditor/ckfinder/upfile/files/xuforu.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/cf3ad058551ece5e79735973178b9896/77079943489.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/ojarp36aavb3if5t2b01020k81/godufelozogirovon.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_off00012432.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12432 18940 bytes
SHA-256: d88b070cafd2c9063b85c16109e10ee3dda096610e961638b287a6a90d656b5c
font_01_sfnt_off00015567.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15567 11328 bytes
SHA-256: c8aa7d6dd8673287f53e63d9c650291ce758aa58ec45a078e75604ccb47f918e
font_02_sfnt_off00016f75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16F75 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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