Malicious PDF — malware analysis report

Static analysis result for SHA-256 c51a7eeb5f5a0d86…

MALICIOUS

PDF

107.7 KB Created: 2021-06-25 15:38:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ed5b1b17dfc381d6fe78d5b0c6113fc7 SHA-1: 9e71b6c8f27539af83c22ef1f77c24fd9f27809d SHA-256: c51a7eeb5f5a0d86c4a025b8cd263e07f3606e24cb3fe73ff524957b56fcd1df
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV also detecting it as a phishing trojan. It contains numerous links to potentially compromised websites and a deceptive download button lure. The embedded URLs suggest an attempt to redirect users to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=jamshedpur+in+which+state
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c361bd077a8---87678730486.pdf
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b49f2212e04---25921103659.pdf
    • https://istanajpdua.com/contents//files/91579304562.pdf
    • https://thewaves.net/wp-content/plugins/super-forms/uploads/php/files/5b0uutcus9b7de19f7vph8qb8u/24493490614.pdf
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/c9mokkhvami03l8nk4v2h946s6/52146062284.pdf
    • https://www.kcequipment.com.au/wp-content/plugins/super-forms/uploads/php/files/ad3457389e0c750c6ea52a13feea2f3f/babumuge.pdf
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/ad1facb3b47a7d20bbffafbdfe173898/sijibabetufokunipovo.pdf
    • https://anfauglir.com/images/file/ralipo.pdf
    • https://tatsolarlight.com/uploads/files/jujiduzowogimu.pdf
    • https://ka-base.no/images_content/file/tafumoxuna.pdf
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4e664ae729---zolimalemegagim.pdf
    • http://originalcheck.it/public/img_admin/file///zavuj.pdf
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160989169f2ef6---63723603152.pdf
    • https://lapdonline.org/file/sagarifovepubunusuzut.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://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_off00013c78.bin
281ab437106bed87478c5703ed891aa40660019dffdbacecca98e5f70e5945b7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13C78 10788 bytes
font_01_sfnt_off0001552a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1552A 16792 bytes
font_02_sfnt_off00016d3c.bin
fd6493d4764e679cda3cfc1b3ffd0d02af04a8fa63ad34fc1bda0c5cfbb3120a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16D3C 19912 bytes

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