Malicious PDF — malware analysis report

Static analysis result for SHA-256 235ec54a639c12b2…

MALICIOUS

PDF

80.5 KB Created: 2021-05-18 10:48:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ac6f09ece885564b2e3cab9bb4aecd7a SHA-1: 44db376f9f6d9f25d900a7ca4d42260cfe143b5e SHA-256: 235ec54a639c12b2e2bd70d18139f095333a3e9b9c9634e8daee8b3352099975
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, indicating a link farm for phishing or malware distribution. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or trojan delivery. Although no scripts were explicitly extracted, the PDF structure and link farm heuristics point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://arrayamed.com/userfiles/file/40547658164.pdf
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/a11b227fe9d8450a9fef645444215ecf/metume.pdf
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/8fd78b0df870d74fe4f712c0f2c18656/janakedimanotokexomezorev.pdf
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a06a352c82d---9503633636.pdf
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/n0ehakcfmf8h4fuqaskn9vbhv3/68696918763.pdf
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/drvs5lc3irgit4q25e62v5jgcr/jijimi.pdf
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16072f551f3f62---51201307033.pdf
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160a32c605f175---jimivaliramunabokabidi.pdf
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/ea520d6bcb489b50128b114d6c3c5193/gulamogolesixakul.pdf
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160711a8c127ec---salavatebifogaledik.pdf
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/6dea643040d367194b187d9e0be59dee/68542736574.pdf
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/melisuzegexulifonabesune.pdf
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607da51e54d87---fepexaditumiki.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=dieta+cetog%25C3%25A9nica+plan+de+21+d%25C3%25ADas+para+adelgazar+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e2ab.bin
ebf6b307afb92194939c74d8c294373402e903a97c4444b66bc448712d979418		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE2AB 5752 bytes
font_01_sfnt_off0000f622.bin
166fc4c090803d9086ce86474df814f031ee20695c73cc9052f2c76e4f952399		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF622 11848 bytes
font_02_sfnt_off00011cfe.bin
159427b32ed66bfbde86def5e6c2992bde67dfb25400c4000a37c9b59b949b61		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11CFE 16140 bytes

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