Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f1c1eeb52b77637…

MALICIOUS

PDF

109.3 KB Created: 2021-06-26 13:06:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 34ce3521f01c3b9931df0fdbfde8c056 SHA-1: 703e4729bf4395749697c1440418266c71e4b851 SHA-256: 4f1c1eeb52b77637441e5af48d14d0a240ca91f8be228f3fa07c8a964c8844d2
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, embedding numerous URLs that point to potentially compromised WordPress sites and disposable hosting. These links are likely intended to redirect users to phishing sites or download further malware, aligning with a common attack pattern for malicious documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/ehqm110b2tkjbp4gnr609p8p60/dulubonamavoge.pdf
    • https://medicentrumnz.eu/medicentrum/files/file/bipiv.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160bbc20244fc2---kebovonavedekezobowi.pdf
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/b97fc996a722f4933e62b3509cfa8a86/59171001216.pdf
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/ojdo8vf19lsro7vgc4q233o1o6/44050622884.pdf
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb131187b1---25512227382.pdf
    • http://greatnice.club/updatefiles/file/38350630540.pdf
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/ql2jfnkt3gle47iiprl7ik264k/85338933686.pdf
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/tcc26vnbe3j23cd02vhf6ddsk9/vidipodazusawedojezawab.pdf
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a750c757431---55240093427.pdf
    • http://amsaneeraus.fi/userfiles/files/3308345678.pdf
    • http://afgventuregroup.com/cfiles/file/wofikirorebifuso.pdf
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/777cc06585cd2dae7c504bc07b517c6e/8106160281.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084f9b4c9a8f---99088760947.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c866598649---jiwizepodukoxeg.pdf
    • http://dekoblickfang.de/userfiles/file/29250359127.pdf
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160879aff6abc1---najedexodadofebane.pdf
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/55861f76f381849e4fb96469d3c7ed8a/44947584719.pdf
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16099e9cac1efd---kabatiwirisubuladinisore.pdf
    • http://tcsm62.org/uploads/news/file/81052338856.pdf
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/036etbvsvpel7hsmo15lgr9pht/kowogetemonisagerujalise.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=honesty+is+the+best+policy+marathi+meaning
    • 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_off00013ae9.bin
20c8ec50d002cbcda13840fe5b98a3ba81384bad4e34ec948c90c965f34a59db
pdf-font-stream PDF embedded font (sfnt) at offset 0x13AE9 22792 bytes
font_01_sfnt_off00017656.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x17656 16792 bytes
font_02_sfnt_off00018e6d.bin
103e2fbd5419b88f1bf9888382e8addb002a2535a1abdf401947e7cc2ed2610b
pdf-font-stream PDF embedded font (sfnt) at offset 0x18E6D 11064 bytes