Malicious PDF — malware analysis report

Static analysis result for SHA-256 22b23e9c9748bfaa…

MALICIOUS

PDF

79.8 KB Created: 2021-07-18 23:21:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c357230b063ad46db0e1355bd1a7bceb SHA-1: 02fdd9703cdfb8630af6d9e59f5123e235e19b4a SHA-256: 22b23e9c9748bfaa864e9ded06c2174fa61073be159abd9ed9a554b442d864ca
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised websites, a common technique for phishing or distributing malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to lure users to malicious content, likely via a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 https://doellefjelde-mussemarked.dk/images/newsmail/file/27090296349.pdf
    • http://jorkurojus.com/userfiles/file/gutibiletoxosiwasivedibu.pdf
    • http://bomtvcloud.com/data/board/file/20210511233415.pdf
    • http://findmealocalpainter.com/insurazon/admin/userfiles/file/buxek.pdf
    • http://asustainable.com/global/file/18351996672.pdf
    • http://lamelove-zakryti.cz/userfiles/file/gavewobemedazimisaxukiw.pdf
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/ebfa6e29c21b1d031ad375f3bb8fbca2/rafasikibeditoroguloked.pdf
    • http://bigxra.com/uploadfile/file/2021070911300873499.pdf
    • https://denizlihorozu.com/resimler/files/zebavuf.pdf
    • https://bio-obst-und-gemuese.de/userfiles/file/95302534958.pdf
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160bf93924c2b9---32560269832.pdf
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5ce19e2600---potibisezoranubilafewur.pdf
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ac859b4bd35---62567236078.pdf
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/qrp1d2nsrogtsu0j3s40i92ct1/kogerotometinuviwawu.pdf
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/f72463e1053c98df0721ddadfee8a988/47228958108.pdf
    • http://gazosilikatnn.ru/uploads/files/pogapuserituwejudupusur.pdf
    • https://samarpanbharat.org/trila/userfiles/file/kixadulimulivanowif.pdf
    • http://esebtekstil.com/resimler/files/37180867581.pdf
    • http://biurod9.pl/public/userfiles/file/19139595768.pdf
    • http://kiddeefire.com/media/userfiles/files/69487546874.pdf
    • http://kapelski.pl/userfiles/file/liwurobanel.pdf
    • https://actorconseil.com/files/file/lexopojegu.pdf
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/178154d242eb4e02b17fd9056668a7b6/72299851607.pdf
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607df4a470d27---xativag.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=microbiology+books+for+mbbs+pdf
    • 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_off0000d46e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD46E 16792 bytes
font_01_sfnt_off0000ec85.bin
0f61961d6516ad10b5116d800d4790c7fc0b2a5557a7a5be286b7f2d7d826285
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC85 10804 bytes
font_02_sfnt_off000104f5.bin
56b0340273b4878f637de8f559f6ebedc5767f307e89c4e08099e0212f256e7b
pdf-font-stream PDF embedded font (sfnt) at offset 0x104F5 17196 bytes