Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f63cc52466ceb18…

MALICIOUS

PDF

85.1 KB Created: 2021-09-19 09:35:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 86b95bee8a3eb45dd9ec14e15eae685b SHA-1: a2b9266c3c055b31d887762c3534064ba5b5b4c8 SHA-256: 0f63cc52466ceb18927c5dcb2f2bf25f96f2d9ef40230aa95f5d3f6a80e208f4
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm with numerous URLs, many pointing to disposable hosting or compromised CMS uploads, suggesting an attempt to distribute malicious content or redirect users to phishing sites. The presence of multiple PDF link farm heuristics reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://goez3.com/10005001208290177/ckfinder/userfiles/files/navata.pdf
    • http://zdrowejaja.com/Upload/file/wevevojodi.pdf
    • http://fnathservices.com/upload/file/33532209081.pdf
    • http://szpitalstrzelin.pl/userfiles/files/tekukaruporisos.pdf
    • http://fantalife.nl/userfiles/file/pimeb.pdf
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142153cc8c37---ziganuvetuvefexewefekakax.pdf
    • https://trungtamgiasuhcmmq.com/uplaod/quangtri/files/tesakutefap.pdf
    • https://reazfarah.com/ckfinder/userfiles/files/37241125836.pdf
    • http://adams-gold.ru/archive/image/file/89151720824.pdf
    • http://finalbrand.cz/upload/file/47928479943.pdf
    • http://ceramvetro.net/userfiles/file/38807460871.pdf
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/d6936a3b6h3l07vn9mhcc6ot2r/39851786115.pdf
    • http://ipai-bg.eu/img/file/89021943691.pdf
    • https://beytarimcilik.com/admin/editor_resim/file/40164748907.pdf
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/7017d4b27b22b46349537a9fc5045cbd/24595500384.pdf
    • http://thevalleytrader.com/files/94419690817.pdf
    • http://rayanchem.com/d/files/xefonu.pdf
    • http://galenbio.com/images/upload/file/mibezemixanalupugezizexar.pdf
    • http://lobanowscy.pl/userfiles/file/60626976803.pdf
    • https://www.weboonline.com/ckfinder/userfiles/files/rakulenesotidagupaguduzi.pdf
    • https://catbasailing.com/upload/fck/file/68796588997.pdf
    • http://hoteldazegliotorino.com/userfiles/files/jamezawuzoxusedabodokeg.pdf
    • http://hiniceshine.com/upload/29379050562.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=how+to+find+apk+in+android
    • 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_off0000e61e.bin
ac67a1bbcf26de6722d34db37e58dd2e34cb314ba88a800601e10563fadfc278
pdf-font-stream PDF embedded font (sfnt) at offset 0xE61E 19096 bytes
font_01_sfnt_off000117ab.bin
47d4fef82d0826ebe4a3bf6d9ed0dedb2f10d2072b8c96bb339ced2038c39e68
pdf-font-stream PDF embedded font (sfnt) at offset 0x117AB 10316 bytes
font_02_sfnt_off00012f01.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12F01 16792 bytes