Malicious PDF — malware analysis report

Static analysis result for SHA-256 abb2480b80e7e417…

MALICIOUS

PDF

81.0 KB Created: 2021-09-17 18:42:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c4749550dba66b9263b8701c41712b84 SHA-1: 74753ead7fde6226347ba71777a7774e60ce76e2 SHA-256: abb2480b80e7e417e969e8fce48bb4e299e70d2d54d9f566b0e6b03c3a32182d
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that point to various websites, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple external URIs and link farm heuristics confirms the document's role in redirecting users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://synerhu.ru/uplcv?utm_term=searching+for+service+android PDF link annotation
    • http://thumpamonpally.com/userfiles/file/53894683203.pdfIn PDF document text
    • https://umiyawoodworks.com/fckdb/userfiles/file/vuwazoxuxiwipoloroj.pdfIn PDF document text
    • http://captainkillmite.com/uploads/files/202109090431415240.pdfIn PDF document text
    • http://skonasystems.com/userfiles/file/48655628992.pdfIn PDF document text
    • http://hk-sai.com/ckfinder/userfiles/files/vemisorawefejimikiz.pdfIn PDF document text
    • http://esipro.be/userfiles/file/90202799845.pdfIn PDF document text
    • http://thietbibepnhahang.net/media/files/susododisebekevepe.pdfIn PDF document text
    • http://fullcolorspandoeken.nl/userfiles/file/58476779417.pdfIn PDF document text
    • https://astdubai.co/userfiles/files/98314412866.pdfIn PDF document text
    • http://fujiya-burbank.com/uploads/files/78387208252.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/fcd7930b2efd0b3dccdb0205cf04d830/sawerumawegurikedexub.pdfIn PDF document text
    • http://nextgenship.net/upload/file/20210906163090923639.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/6426f4c1f7d3ec9c475f3846559aeef2/rufeporelejapuwotoroni.pdfIn PDF document text
    • http://jfe.hk/userfiles/barifumozigi.pdfIn PDF document text
    • http://a1-automotivegroup.com/upload/files/3900935994.pdfIn PDF document text
    • http://xsteelstock.com/d/files/paxegipoketudo.pdfIn PDF document text
    • http://bestbelly.org/content/files/files/49677506548.pdfIn PDF document text
    • https://khanikango.in/file/66670778727.pdfIn PDF document text
    • http://studiodispirito.it/userfiles/file/vurilibezutawekemobuguvo.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/2f62f4ac397a01fda13913a3f616308c/94240465366.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1614216970fc42---68082334724.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/naxuwidipibanexijipig.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131302a438d5---punodujedajawozefefamufa.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_off0000d834.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD834 10752 bytes
SHA-256: 333fb9b91e0069cf33cd6d61c925370e598b3b336406ce2e0ec6f5085cf3f0f8
font_01_sfnt_off0000f0ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0AC 17496 bytes
SHA-256: 6ffd195f26bcf57d1b314d9f1cc9edf1721edae93bc48b942164e2c07c3b2699
font_02_sfnt_off00011e35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E35 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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