Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e3badac56f28610…

MALICIOUS

PDF

87.7 KB Created: 2021-07-13 16:42:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 85d1060d3e60ce2f7cb0e87ee7516c2e SHA-1: 3f220422fec1dfd330cec9c9d1dd3d3c6bfa44bd SHA-256: 6e3badac56f28610eca7d76f202c6985f81070650bcfb8b108391acc008b41b0
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. Heuristics indicate the document functions as a link farm, directing users to multiple distinct hosts, many of which are hosted on disposable domains or compromised CMS upload storage. The embedded URLs and the nature of the heuristics suggest the primary goal is to redirect users to potentially malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://werkkledingverkoop.nl/images/docman/files/44327741644.pdf
    • https://audit-advisers.com/userfiles/file/24270870584.pdf
    • http://jandenzobv.com/image_uploads/file/januwilizusamo.pdf
    • http://marinapogon.pl/upload/file/polasurumopekavuvozurizeb.pdf
    • https://iominneapolis.com/wp-content/plugins/super-forms/uploads/php/files/78de260ee2622b9a4611893662be9a32/fevalixiwipuromurolupevep.pdf
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/1ba8209323e15b21ac13d383fe18ce0c/62314728123.pdf
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/kot9g08a3er42ui8klo5b90htg/4296865171.pdf
    • https://drlanda.hu/user/file/gikozenaruvapexi.pdf
    • http://taxicityplus.ru/userfiles/file/70395429147.pdf
    • http://funkyspa.net/ckfinder/userfiles/files/27615351865.pdf
    • https://banktapeunadana.com/tapeunadana/bank2/admin/userfiles/file/janadiwoxukudesoduso.pdf
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160d3f4217e37c---75004407671.pdf
    • http://www.mueblesgamez.com/ckfinder/userfiles/files/3484788279.pdf
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c303118ed33---93241530677.pdf
    • http://linpus.com/app/webroot/userfiles/files/juxubejulijizetevizagu.pdf
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/ff10e79078236169c8981173855b3c70/20738554231.pdf
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160741dbe26d39---jedarelimutukobopaw.pdf
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/160925cca60233---mamezeb.pdf
    • http://chronicles.ae/userfiles/files/68628840578.pdf
    • https://psystat.net/candyticket/uploads/page_images/files/32570492085.pdf
    • http://lnaixi.com/userfiles/file/20210630044156_177703297.pdf
    • https://marljivo.hr/userfiles/file/84881052370.pdf
    • https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/23005215b841fb4835fb46ef094e47e1/94746761824.pdf
    • http://cnp-inc.com/ckupload/files/fudoxemipafigilevuludup.pdf
    • https://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/36fd070d1f3affee3b1da68e879788ef/97087299560.pdf
    • https://aimhc.com/userfiles/file/vesojuvujam.pdf
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16090d45554033---61359329245.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=outbound+appointment+setting
    • 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_off0000f427.bin
762acfac9dafc23f1527f9665bd33c701607ff1750746988e22d2275046332af
pdf-font-stream PDF embedded font (sfnt) at offset 0xF427 17196 bytes
font_01_sfnt_off0001208b.bin
d54f618c98c71742573951207a53b6536e7127eb427a7c89455b081b0e277ec8
pdf-font-stream PDF embedded font (sfnt) at offset 0x1208B 10856 bytes
font_02_sfnt_off00013939.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13939 16792 bytes