Malicious PDF — malware analysis report

Static analysis result for SHA-256 344f43b61b0415ec…

MALICIOUS

PDF

85.8 KB Created: 2021-09-07 05:06:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 24a2754d6f67dd076db809e39f85c9e2 SHA-1: 702941406e26aca876407ce5c9bd7724b773c9a3 SHA-256: 344f43b61b0415ec8db8de7c0d805163a7666cf87afbdf07ea778958beced746
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous domains, many of which appear to be disposable or compromised, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were extracted, the structure and URL patterns are consistent with a malicious PDF designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://vitalchurchesinstitute.com/files/file/37027782126.pdf
    • http://massimoandyuethui.com/clients/69227/File/49921577596.pdf
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/86cad0d846646e81e2eee767f5c63977/23328370238.pdf
    • https://micsys.in/userfiles/file/tesopulikasadexotak.pdf
    • http://bluecars.pl/userfiles/file/dakix.pdf
    • https://adverto.ee/userfiles/file/47562245597.pdf
    • http://kondicionery-dolgoprudny.ru/upload_picture/file/gagemexokefemejirugipujuz.pdf
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/fc844aae4f2883bf51832dd379270639/vizisedumawebiga.pdf
    • http://glina-master.ru/admin/ckfinder/userfiles/files/pegilova.pdf
    • http://kleinschaden.expert/userfiles/file/36465979394.pdf
    • http://uleshuzatshop.hu/files/file/riroduforotojusadiruk.pdf
    • https://nepalimodelagency.com/userfiles/file/10666808358.pdf
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086690289c8e---53776974429.pdf
    • http://asiadomainstore.com/userfiles/file/sudoje.pdf
    • https://ropaalmayoreo.com/images/userfiles/file/38068947886.pdf
    • http://dakmet.pl/upload/86471100828.pdf
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/9dd1cf8a8ab72bbf18d8a18d200abba6/nosunudilotasesuvezevoxa.pdf
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160842d7b8b089---bidupisobulit.pdf
    • http://bukharasuwanee.com/sites/default/files/file/56256729673.pdf
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/1611d852611092---ponavopa.pdf
    • https://sogelec-eng.com/files/ckfinder/files/57962529894.pdf
    • http://chanakyaaerospacedefence.com/userfiles/file/xevun.pdf
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/7373aa28103516063d9a6c9bc99f5435/72560869702.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=circular+motion+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_off0000e42d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE42D 16792 bytes
font_01_sfnt_off0000fc3f.bin
3aec7a68cbbf3671743eec1b0ad91d504a8fc232c5778b66e76cb4a0b84167e9
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC3F 20592 bytes
font_02_sfnt_off000131eb.bin
3668148b6622cae5381764652b9915b4ef29c095e1777a4d68e8e73e94e77e80
pdf-font-stream PDF embedded font (sfnt) at offset 0x131EB 10612 bytes