Malicious PDF — malware analysis report

Static analysis result for SHA-256 16c90b43bf47760e…

MALICIOUS

PDF

132.1 KB Created: 2021-07-19 14:10:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 2e740612a23866d329705025c18dc124 SHA-1: 28ac398e31166f353a721bc95577f91070303552 SHA-256: 16c90b43bf47760e1068e0a3b8c4fe88648bc76060c5ce2173360e9b11aeaa61
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature. No scripts were extracted, but the primary attack pattern involves directing users to external, potentially compromised, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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 http://bagiez.com/userfiles/file/xekelomebibuvopu.pdf In PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/8f5662rg87jdjdat6dvdeb4fpd/wixozobixedizisimojap.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/5q002lcagd98i57tcki7ppjk6u/89442138750.pdfIn PDF document text
    • http://74ahs.com/clients/2/2a/2a132ee8da0778863662fd4b1fa251ed/File/pusubijuzilazujutudo.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-7-5/20210705145431848975.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e266aabb6a---96202352714.pdfIn PDF document text
    • https://www.saammohaseb.ir/wp-content/plugins/super-forms/uploads/php/files/1aab13666dc99278caa04da7593fafcd/kekote.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d63f0e1a97---66989311113.pdfIn PDF document text
    • http://thermcom.cz/userfiles/file/megibisudowolowamuk.pdfIn PDF document text
    • http://apvn.info/userfiles/file/44466483812.pdfIn PDF document text
    • http://numismatika-nbkpdy.cz/userfiles/file/22664447495.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fc1e5d0a66---29880947925.pdfIn PDF document text
    • https://dimensioninteractive.com/WYSIWYGImage/file/26018389673.pdfIn PDF document text
    • https://whiteelephant.co.in/wp-content/plugins/super-forms/uploads/php/files/b2c08ec38e1a26df10571db44301e3ce/kimujajogezijaxobemo.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a803bf6c3bf---99928004342.pdfIn PDF document text
    • http://spamsmsgiare.com/media/ftp/file/fodak.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/kabule.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160f08029c1342---gejivefezubijaweneked.pdfIn PDF document text
    • https://clubsportedinburgh.org/userfiles/files/46085270100.pdfIn PDF document text
    • http://banning64reunion.com/clients/a/a7/a71e9339640f4be667ed55590a288245/File/91005475256.pdfIn PDF document text
    • http://kiemtoanhaiphong.vn/upload/files/sometogupamopegebe.pdfIn PDF document text
    • http://metall-press.ru/files/9643973191.pdfIn PDF document text
    • http://1utilaje.ro/mm/file/8874570560.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=question+and+answer+of+the+adventure+of+totoPDF link annotation
    • 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_off0001a4e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A4E0 10716 bytes
SHA-256: ea3a2f2a6761af658970f2c73320542db891553fd62bff52e62c8e5c13de8afd
font_01_sfnt_off0001bd9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BD9E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001d5b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D5B0 17368 bytes
SHA-256: 12c898d7910538a6c193446f11985135b9ad998e5177f8d7d15fd6d4b3c3dda0

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