Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b3c61bb36b549d7…

MALICIOUS

PDF

122.2 KB Created: 2021-06-25 12:22:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bb30e62e40553fff87293e0510ceffee SHA-1: 35b2642f1c0d0d666450a4336b92f5f8da084af8 SHA-256: 4b3c61bb36b549d76dcc2bffa08587b5809cab2fd0f2c8b57b5733d316195ce0
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that point to compromised WordPress sites, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent. The file's structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608aaae8c4201---jolupuvivigipujozi.pdf
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/ars5v24l44mh3b5al8skgftb07/7180346714.pdf
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/2fb17f0496c1026376264db6c5634732/42232165171.pdf
    • http://magyaringatlanadatbazis.hu/dev/_user/file/21130806923.pdf
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/32aeb96e34cad4ad11f76fcc9cbb47f4/retoluwezitetuxutaju.pdf
    • https://alteanetworks.fr/img/file/widojeterokat.pdf
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/afee6481eaa81d930f028edd4a9c4cde/zusefavovedufoxamof.pdf
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/su4apti49iig7tmn04saq2ft61/69467043570.pdf
    • http://mea-travel.pl/userfiles/file/rugotefi.pdf
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afbf764e126---56967861404.pdf
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/c84f67b025f3e673a912fbf9cea30590/34781276208.pdf
    • https://binarbaidrealestate.com/public_html/userfiles/file/1762290352.pdf
    • https://traveletrust.com/basefile/traveletrustcom/files/wuxulawatimikajal.pdf
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ed80a7b24a---kiwanigizok.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=dometic+rm3862+manual
    • 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_off000181e6.bin
91ec6d8b1368ae7b64cf3bad37c8159f93437fd55d7f0e259b11da15fad2a152		 pdf-font-stream PDF embedded font (sfnt) at offset 0x181E6 10992 bytes
font_01_sfnt_off00019b7a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x19B7A 16792 bytes
font_02_sfnt_off0001b38c.bin
5ac52f5b57af4946e46ce646da42efd4499ad8a615dfe60a88f8b3123791d164		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1B38C 15936 bytes

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