Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ad4b02d2c4cf175…

MALICIOUS

PDF

98.8 KB Created: 2021-08-30 04:51:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 6fdb49dd08c44d9589ccd3c7564a1267 SHA-1: ff5e4913c1cfbe1e9ec54e3bdfef4b8390735841 SHA-256: 5ad4b02d2c4cf17568d69276c89db4e53364abd8744cba4732f0d4c8d4969c4e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the PDF acts as a link farm, directing users to multiple external websites, some hosted on compromised CMS uploads. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it is designed to redirect users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1bdfe5b1b---50895402985.pdf In PDF document text
    • http://svx.su/ffile/file/wozudadu.pdfIn PDF document text
    • https://progin.swiss/ckfinder/userfiles/files/jagupo.pdfIn PDF document text
    • http://apluskleaning.com/admin/images/file/13902054336.pdfIn PDF document text
    • http://wami.cc/data/files/2310109083.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/7e009874d4b8f3320fbb6fec7bc7d1e8/xavowofanuwovezo.pdfIn PDF document text
    • http://drzwiukryte.pl/userfiles/file/laraxugozuvovadomunewuj.pdfIn PDF document text
    • http://dagmar-e.de/userfiles/file/2299005776.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/37234970696.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/69746123318.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/9ld7e7187fobrj92bvltmn1si1/posejifadiwirirorawafafen.pdfIn PDF document text
    • http://sibmetiz.ru/upload_picture/97332095323.pdfIn PDF document text
    • http://sz-nuoyi.com/Upload/file/2021082707284477847.pdfIn PDF document text
    • http://hoshitorionline.com/uploads/files/vizasofekenuwefutuka.pdfIn PDF document text
    • http://chizclean.ru/files/fck/file/tikokikot.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/40469770279.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/9dfafa8a1ef33d468a8e8a987fe4c755/wufaluwejipopix.pdfIn PDF document text
    • http://saeronbio.com/userData/board/file/numatovedokifokugumadu.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4d092f3779---niwosofig.pdfIn PDF document text
    • http://fiumevivo.it/userfiles/files/68021484232.pdfIn PDF document text
    • http://graham1978.com/clients/79565/File/52989466862.pdfIn PDF document text
    • http://snap-drone.com/userfiles/file/7601788763.pdfIn PDF document text
    • http://remobudostol.pl/pliki/27841859426.pdfIn PDF document text
    • https://zippy-inc.com/app/webroot/userfiles/files/wepiwulugifa.pdfIn PDF document text
    • http://fecirturizm.com/resimler/files/76169363797.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=rational+exponents+to+radical+expressions+calculatorPDF 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_off00011bc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BC1 10752 bytes
SHA-256: 155c006f41d5fae2eaa03333ba8b7665ad90db87feaa77978adac34b0b7b467d
font_01_sfnt_off000134a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134A4 18588 bytes
SHA-256: ad41481803a32fddf1b6efff1e79e59862de41a84a97f2a77b5f9bc4e7368977
font_02_sfnt_off00016526.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16526 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1