Malicious PDF — malware analysis report

Static analysis result for SHA-256 88f7fa241635b153…

MALICIOUS

PDF

89.8 KB Created: 2021-06-27 00:54:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bc68afe449c895df40f57e8de62e0384 SHA-1: d258bb851b0cb6f00d51b26316d542c2a033cd06 SHA-256: 88f7fa241635b153dcf471ef035ef6e32ecd21449bd20c7acfa6328a6c51ef0d
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to compromised or disposable hosting domains. The document body is heavily obfuscated, preventing analysis of its direct content, but the overall structure and URL distribution strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://busankid.com/webfiles/board/file///jifilokakomamijafafe.pdf
    • https://xn--80afc2apd5n.xn--j1amh/upload/files/xatokitimamuje.pdf
    • https://digireg.sk/upload/17178536868.pdf
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/23mjgig6ssotu2t47dde28cnc3/sofevabufevofot.pdf
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/afetkmtm7ofisb7vvts5kvbae3/midogifoxexogatuv.pdf
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b7091936f0---60610202764.pdf
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160785e02b4d35---67383999897.pdf
    • https://artbynela.com/uploads/file/36768497503.pdf
    • https://bamfieldrental.com/userfiles/file/6168960420.pdf
    • https://accuratesearch.com/userfiles/file/suwewafofilotawit.pdf
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1608f36555b1ce---nakud.pdf
    • https://papersacksfactory.ae/images/bulk_images/files/regomeled.pdf
    • http://magogaralbamoble.com/galeria/files/51361089787.pdf
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5fe55e0784---22509447503.pdf
    • http://bsp-oblspl.org/ckfinder/userfiles/files/7738349046.pdf
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c953629f44---65971595769.pdf
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/vjla8pcdpgjsipes3mis97af2d/10665397133.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=snacking+good+or+bad
    • 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://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_off0000fa7a.bin
bebfe7d619767f7c9649957db50864fe5161b36a3369c8b21fc026748b1a1c5f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA7A 10408 bytes
font_01_sfnt_off000111ec.bin
c3426e9a33026e1491c9f43438c4844175243d97151f5c5c0323d0c8f2d9cd16		 pdf-font-stream PDF embedded font (sfnt) at offset 0x111EC 18016 bytes
font_02_sfnt_off00014104.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14104 16792 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.