Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cce5b69ba4fef00…

MALICIOUS

PDF

80.7 KB Created: 2021-09-15 12:55:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 51d2ca36863c0da4d42d15633fddc17e SHA-1: c5c630db63b8cdee8f5ee9bcd7ef8106fa0775ec SHA-256: 3cce5b69ba4fef00b1c10c7cf5169ad3137125b02cae22abda6a89764eb11dc2
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised or disposable hosting, suggesting a phishing or malware distribution scheme. The PDF structure itself is minimal, with the primary function appearing to be redirecting users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://paglialonga.it/userfiles/files/nisuxez.pdf In PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/6beebdd1c84a4e5359ba8068ca63b6e8/xepur.pdfIn PDF document text
    • https://kermoulin.com/userfiles/file/42053575032.pdfIn PDF document text
    • http://ux-school.ru/files/files/79179863531.pdfIn PDF document text
    • http://world-housing.jp/ckfinder/userfiles/files/mewuxaridufemapejipoji.pdfIn PDF document text
    • https://padservhosting.com/userfiles/file/mevuzoxifilubu.pdfIn PDF document text
    • http://reichspfarrer.sk/file/53286967187.pdfIn PDF document text
    • http://harryreichert.de/uploaded_pics/News/file/golixizazofozog.pdfIn PDF document text
    • https://ozmutludokum.com/userfiles/file/gavomunelefuvura.pdfIn PDF document text
    • http://studio70.eu/userfiles/files/36165183463.pdfIn PDF document text
    • https://indiansabroad.uk/userfiles/file/24113170846.pdfIn PDF document text
    • http://lukinserv.hu/file/fuvozegab.pdfIn PDF document text
    • http://ssaisarang.com/ckfinder/userfiles/files/wimutono.pdfIn PDF document text
    • http://a1-automotivegroup.com/upload/files/9403813591.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/1b74347775b08663c3d35dc7f26ddf25/33596226176.pdfIn PDF document text
    • http://gabortech.com/admin/file/13893407049.pdfIn PDF document text
    • http://becucci.it/userfiles/files/dokasoterona.pdfIn PDF document text
    • http://latiendasegura.com/contable_prueba/userfiles/file/feziximem.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613987abc6fdd---90149783333.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/161405fbddcb80---92202381685.pdfIn PDF document text
    • http://www.almansori-ye.com/almansorifiles/files/namadox.pdfIn PDF document text
    • http://jingyilin.org/uploads/file/42947448975.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=krrish+game+download+apkPDF 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_off0000d833.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD833 17060 bytes
SHA-256: d144477bd290469e03519fbffc2151f56f8a326c90d6ccc9d32db155ba09f99a
font_01_sfnt_off00010421.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10421 10912 bytes
SHA-256: 6beae69575612b9cff0bc8fee807f0e2faa28f0207e96c60e979bd3d9c1ff84a
font_02_sfnt_off00011d04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D04 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1