Malicious PDF — malware analysis report

Static analysis result for SHA-256 a32fa17807a18c8d…

MALICIOUS

PDF

91.2 KB Created: 2021-09-07 16:16:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 7fa9a2dcbad467f4d86601f3690c8b85 SHA-1: f99765a219659e37b3a19c68591e1ff6e1b3fd33 SHA-256: a32fa17807a18c8d8002f83bb40dae3e883356b8674f70e3cc2db159d9c8e8e3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links, many pointing to compromised WordPress upload directories and disposable hosting, suggesting an attempt to redirect users to malicious sites. The presence of external URIs and link farms strongly supports a phishing or credential harvesting attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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=entropy+definition+thermodynamics+pdf PDF link annotation
    • https://fasleh.net/Files/files/rovajifidafebova.pdfIn PDF document text
    • http://imoroz.by/upload/file/bepiborurarovivenulos.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160d24d0ca99ac---riligafisedixafot.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/e1722c917947b271ebc57f3d5980aa9e/rixonemawizamevig.pdfIn PDF document text
    • http://ediljolli.com/userfiles/files/tekazizojabegex.pdfIn PDF document text
    • http://e-store-sys.com/userfiles/file/59697454909.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a260de4e01f---sinoxinireripubinopavor.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16098ac98861cc---jedejebozedefenaxujovom.pdfIn PDF document text
    • https://propiedades.net/ckfinder/userfiles/files/15224006021.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160987d7be1308---telegukavexupenikoze.pdfIn PDF document text
    • http://wxhsbl.com/ckfinder/userfiles/files/20210625_035918.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1608a316b4737b---ratilusikipajuzoboxi.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16091b72a5b804---59654239106.pdfIn PDF document text
    • https://sieuthimaycafe.vn/uploads/file/26055402941.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/16100ea9ddfc9b---94595387988.pdfIn PDF document text
    • https://nabsangram.com/userfiles/file/xoperupubonilig.pdfIn PDF document text
    • https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/5v0c3jt8ucvpicrfe3mgk6431d/91816427670.pdfIn PDF document text
    • http://malir-naterac.info/UserFiles/File/52732577464.pdfIn PDF document text
    • http://thepokeluau.com/uploads/files/9421137599.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/kgidqiqe2mtditiuhe5akg5q3g/xojuwenedodunoju.pdfIn PDF document text
    • http://yishiweb.com/upfiles/files/20210608_114817.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/22225209384.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16096d8ec6f8b2---gowaxeropin.pdfIn PDF document text
    • http://orderleesushi.com/uploads/files/45395070208.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_off0000f96b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF96B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011182.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11182 10936 bytes
SHA-256: 838de3a618f8fdbaeff4134c87472ff35bfac02d006fabe9a6c2b954a8dfd548
font_02_sfnt_off00012ab0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AB0 19932 bytes
SHA-256: 746594e7a128ae51e440e6f1561eccad1140da591f7db5da45dce0c1c9c3caf9

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