Malicious PDF — malware analysis report

Static analysis result for SHA-256 373507c080948ad9…

MALICIOUS

PDF

80.8 KB Created: 2021-09-20 09:33:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a75d4f47bd241d5066930b79d5e4173c SHA-1: da2fb3b9e0168655926ce600199df39196462bf8 SHA-256: 373507c080948ad991e77fd3342785653b7b5f790d32882122080830a529f5da
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to compromised WordPress upload storage and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery via these compromised sites. No scripts were extracted, but the structure and URL analysis point to a common PDF-based lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://kham.vn/userfiles/file/sogabagesowesoxizibo.pdf
    • http://www.bluefashion.cz/ckfinder/userfiles/files/kunadafa.pdf
    • http://zatuchlina.cz/upload/file/bemaxifexilepa.pdf
    • http://ladyqueen.it/userfiles/files/rifipivabalomobenuj.pdf
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/161304b8840b57---dekotamoj.pdf
    • http://fsgzb.com/upfolder/e/files/20210911135638.pdf
    • https://avistravel.ro/userfiles/file/mavudovunekefitazilawabax.pdf
    • http://96rangjai.com/userfiles/file/14267128239.pdf
    • https://grupo-kayros.com/userfiles/file/koribesirawog.pdf
    • http://humanlitech.com/files/files/88537765543.pdf
    • https://holcom-wd.com/webroot/img/files/kumidoz.pdf
    • https://knoxvilleremembers.com/media/31787877487.pdf
    • http://ediljolli.com/userfiles/files/vaxibuvozaviranolo.pdf
    • http://k3projekt.pl/uploads/userfiles/files/96045882682.pdf
    • https://navliecky.net/userfiles/file/robidegafa.pdf
    • http://decorstore.eu/upload/file/xafozebegib.pdf
    • https://dubaimotorcycletours.dubaimotorhomerentals.com/uploaded_images/files/31883653735.pdf
    • http://sicilalluminio.it/userfiles/files/kalukuvobalisidekide.pdf
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16132372e53634---xoluxuk.pdf
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16145a740dcd72---70650359067.pdf
    • http://spbi.cz/res/file/37249710930.pdf
    • https://ajambary.com/userfiles/file/47796458041.pdf
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614704105ed02---vitovezekanudev.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=blu+ray+player+apk
    • 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_off0000da29.bin
3e048503378161421a9b4d27657f769428d1726ba34ddf7b542c82b293558719		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA29 17336 bytes
font_01_sfnt_off00010723.bin
7ff9d361aed6399e75f8e0dc7c8351cf26956943c6c2bfcb14d32175c7d33ae1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10723 10020 bytes
font_02_sfnt_off00011d90.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11D90 16792 bytes

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