Malicious PDF — malware analysis report

Static analysis result for SHA-256 894139f806e4d26a…

MALICIOUS

PDF

70.7 KB Created: 2021-09-26 22:28:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 80408dd41ba0ecf373accf1e1f95f935 SHA-1: 8769869d155a6c6f459d1261f8076dcce382114c SHA-256: 894139f806e4d26a5bcf383fb4446f18b965b4a21414584106f34992e363c425
156 Risk Score

Malware Insights

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

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 ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution via these links. The document body is unreadable, but the heuristic firings clearly indicate the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://xahscw.com/userfiles/file/23671261648.pdf In PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/161420bc29daad---22019719397.pdfIn PDF document text
    • https://fotoprint.lv/downloads/file/64198041920.pdfIn PDF document text
    • http://upservice.expert/admin/ckfinder/userfiles/files/wajaxesedukuxowu.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1613a3604c013e---pegavolexupakuzimesagonu.pdfIn PDF document text
    • http://www.centralperdana.com/file/86992456056.pdfIn PDF document text
    • http://hotel-ambassador-nice.com/upload/files/1088732021.pdfIn PDF document text
    • https://wanna-drive.nl/files/File/47363828669.pdfIn PDF document text
    • https://barrierball.cl/ckfinder/userfiles/files/lupomumini.pdfIn PDF document text
    • http://mashhadgardi724.ir/basefile/mashhadgardi724/files/zuxoboruvezo.pdfIn PDF document text
    • http://hanahana.vn/media/ftp/file/jilevo.pdfIn PDF document text
    • https://hondaotohaiphong.vn/upload/files/76859425720.pdfIn PDF document text
    • http://kimwendelldesign.com/ckfinder/userfiles/files/fonebupazidegapup.pdfIn PDF document text
    • https://soswzgierz.pl/web/uploads/files/defenunudexadokadapazumel.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/b46a1eb7c6ddc0d7abb5f1b3b5608403/sixinaxutoxomimovibofu.pdfIn PDF document text
    • http://polkovnik.su/upload/file/94153919392.pdfIn PDF document text
    • https://krainaogrodow.eu/zdjecia/fck/file/xidewatifabowov.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/0e1c0d3311385f3db866449ddafe9863/62991277202.pdfIn PDF document text
    • http://pushgroup.lv/userfiles/files/76718857733.pdfIn PDF document text
    • http://melabo.com/upload/files/pejopodibilekowogine.pdfIn PDF document text
    • http://dxline.eu/userfiles/file/7968402475.pdfIn PDF document text
    • http://electronicaindex.nl/images/uploads/1298985828.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=cheat+vip+mobile+legendPDF 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_off0000b11d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB11D 17392 bytes
SHA-256: eb183c5cba691c5e947c6d420a1e15c3dfdf03e49c64da17fb14f3e40b63fc59
font_01_sfnt_off0000dd24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD24 10808 bytes
SHA-256: 0b2ae509622550d98c84cb8e9e41f8cc649483759cb884d76bd9b79e2b2dc57f
font_02_sfnt_off0000f56f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF56F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1