Malicious PDF — malware analysis report

Static analysis result for SHA-256 979d0af41a800f70…

MALICIOUS

PDF

73.9 KB Created: 2021-09-17 16:51:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bd66a6ab3bec68842addf159af201d9f SHA-1: 263db31baac5329f54d67384faaa0b63cef9557b SHA-256: 979d0af41a800f70a33eda2689da620520cf559bb12ce297a5519525b606ac7b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/410ef4f63d10a37420ad7283b69d0107/69469370243.pdf
    • http://xn--9w3b270a7kf.kr/data/editor/file/71673972809.pdf
    • http://ppfi-online.com/userfiles/file/rafowujepuvixiratexivawo.pdf
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/161402fa5f2057---jiwikuzowez.pdf
    • http://tdvvietnam.vn/webroot/img/files/39280120520.pdf
    • http://nawooelcs.com/upload/userfiles/2021/09/files/210913085959.pdf
    • https://jocafoto.com/fotos/file/57841210058.pdf
    • http://studiomistretta.com/userfiles/files/sadogagumogizinusaneso.pdf
    • https://briljant-maleri.se/UserFiles/files/kogenifenuwuvobozabodo.pdf
    • http://stickers-moins-cher.com/userfiles/stickers-moins-cher.com/file/98241995950.pdf
    • http://rszm88.com/upfolder/e/files/20210907163239.pdf
    • https://fundacjaartfreeart.pl/userfiles/file/18948999275.pdf
    • http://jiehuist.com/userfiles/files/koselibezodajab.pdf
    • https://viessmannboilers.ca/fck_upload/file/xisugaledifadepiki.pdf
    • https://owop.challengersports.com/userfiles/files/topegapewizuzakewe.pdf
    • http://nasfthr.com/userfiles/file/bateguxajewopajerogujugu.pdf
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/4a50f2e808ba9afa5bf042bd91bc3ec2/gesodexojunub.pdf
    • https://oncallanatomist.com/ckfinder/userfiles/files/makumarowujoxoritow.pdf
    • http://skolicka.eu/foto/images/file/kimupiduwaxuwu.pdf
    • http://antifftech.com/uploadfile/file///2021090904450974.pdf
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161429b8e5e304---1018384785.pdf
    • http://spbmedaks.ru/sites/default/files/uploads/96296952765.pdf
    • https://truonggiangcompany.com/userfiles/file/3515326699.pdf
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131d06daaad5---dogeropasa.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=scanned+pdf+to+excel+converter+online
    • 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_off0000be43.bin
02f228f93ad05faf700d15dc887af543ffb226bad9964955f889837a6cf32512
pdf-font-stream PDF embedded font (sfnt) at offset 0xBE43 16572 bytes
font_01_sfnt_off0000e906.bin
8a4040db45d8ef789ee9330c343805f36f09ac6148cb26daa7c888aa88f1db23
pdf-font-stream PDF embedded font (sfnt) at offset 0xE906 10688 bytes
font_02_sfnt_off000101b3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x101B3 16792 bytes