Malicious PDF — malware analysis report

Static analysis result for SHA-256 f02c481bace1c352…

MALICIOUS

PDF

77.0 KB Created: 2021-06-30 23:10:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f14a6433838f9c6fa10c56bc7ffe39e1 SHA-1: 18edc9d4cb7fc0567230ec6bb07778eb6707ccbb SHA-256: f02c481bace1c3520499bcdcb56a1b0a99ef0cf8d17ce412d3740884baf00025
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains a link farm pointing to multiple compromised websites and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The presence of external URIs and a link farm heuristic indicates a strong likelihood of redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://khanaphatgroup.com/UserFiles/file/sajekuso.pdf
    • https://gertiesbloomers.com/kousumi/nulook/upload/fckimages/file/62059106756.pdf
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607061eac298c---72427214337.pdf
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160af716c7521b---93965600781.pdf
    • https://laps.pl/userfiles/file/kisimekomadazutudadiponu.pdf
    • https://hondamienbac.vn/userfiles/file/munigebofexujelalaruvetag.pdf
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/c563d5960ed39a64c3e33f1afe57b8e5/tomuxawuzumiwiwedirobuta.pdf
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/d80333080cefeaca60416a61438f1d83/fazotejid.pdf
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160851edb13b47---19811819193.pdf
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/da15803a82b9ac4d514c4f42d7e153ac/lujaxemo.pdf
    • http://atut-biuro.com/uploaded/file/86068237257.pdf
    • http://precedent.by/_newsite/images_from_html_editor/file/7608279585.pdf
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/8p56shh0ck2f2e5ppteum0b2ef/tatifewidemawubuvoret.pdf
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608481c8d2c5f---jisesinazujubonebenug.pdf
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8bce4c9e04---mixusowibulekobowawab.pdf
    • https://pfhotel.gr/ckfinder/userfiles/files/rojozekag.pdf
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/47ov56o1comsvk9eob49873c06/76057292590.pdf
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b80e705feb0---koladi.pdf
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607c315102fed---84029751244.pdf
    • http://veraschwemmle.de/fckdata/file/10191045816.pdf
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/77ab79b37f4d82c52b1419579080c864/25697805723.pdf
    • http://driver-jazda.pl/upload/file/labunuvisinifutedajiv.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=t25+videos+free+download
    • 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_off0000cb89.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCB89 16792 bytes
font_01_sfnt_off0000e3a0.bin
c3e0811587bfa49b275c8d86bd7faeac550d07c07ab3e7af4ef27aea066c519c
pdf-font-stream PDF embedded font (sfnt) at offset 0xE3A0 10616 bytes
font_02_sfnt_off0000fc1e.bin
ea3b8de4785e22a3eadb8608464c3fa830b4cab68cf3960cf44d19113ac1a86e
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC1E 16532 bytes