Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f9362b762e8359f…

MALICIOUS

PDF

76.2 KB Created: 2021-09-06 07:32:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d01b8dabf4dcfd6ec97bf219260eac22 SHA-1: 011e23721e3fa3bc2ed36d55f74fc80d055659c7 SHA-256: 4f9362b762e8359f5460b5d3ef0bae9471139e17c225d8ac45cedfc2f13d5c57
156 Risk Score

Malware Insights

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

The PDF document was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution lure. The embedded URLs lead to domains that are either unknown or associated with compromised WordPress installations, reinforcing the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/28b1s8lqaca3opcirdstvsa5u2/ribunibuvunirakuxusofedub.pdf In PDF document text
    • http://www.aqsclimited.com/EditorImages/file/28435825831.pdfIn PDF document text
    • http://amidoux-peintures.com/ckfinder/userfiles/files/18317926363.pdfIn PDF document text
    • https://aneri12.eu/res/file/65837538879.pdfIn PDF document text
    • http://starlightcelebrates.ca/clients/4/43/43e9139217482d7666ce300faf566241/File/84742958698.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/rbtonhl6e6e98s7anlr1u8j950/nurozilabiduwowe.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/h895knnbg8225ki3sn859bg9l7/5469982084.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/71076563087.pdfIn PDF document text
    • https://virtualpulse.eu/UserFiles/file/23196188278.pdfIn PDF document text
    • http://moscowprice.com/content/xuploadimages/file/85031950728.pdfIn PDF document text
    • https://syteq-pro.com/userfiles/file/40335750217.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/161294b6b0a5de---zilufilepaxidofes.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/576aafdfbdec3874c87d0fe33acf6d02/gikarikamuxiwinume.pdfIn PDF document text
    • http://matsonconstruction.net/userfiles/file/xivisuxowazuri.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf87fc21838---gozofipamopi.pdfIn PDF document text
    • http://studioesflores.pl/obrazy/file/32393012806.pdfIn PDF document text
    • http://melly-incendie.fr/img_db/10249146372.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bc2b0050c9b---vonisuwusivemimo.pdfIn PDF document text
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/505bb416c420194ac9b834510e243320/71625645095.pdfIn PDF document text
    • http://canadanur.com/resimler/files/38968752607.pdfIn PDF document text
    • https://grafconsulting.pl/Upload/file/meximamifowipivifawaliv.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc8cd252269---kavijarekelodobutivuxofug.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d27618ecf70---roboxel.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=klasyfikacja+gleb+le%C5%9Bnych+polski+pdfPDF 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_off0000c1ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1CE 17940 bytes
SHA-256: 494bad94197c9992945edb4ef6b5ff49f3ec9e531653be53bc4d0471ab10c17d
font_01_sfnt_off0000eee8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000106ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106FF 11352 bytes
SHA-256: d5885e8033f2f9db84f0bbad7285193cbbbc3cffa96fce37ae8872ecaf983c7b

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