Malicious PDF — malware analysis report

Static analysis result for SHA-256 087f8f7830ca620d…

MALICIOUS

PDF

71.9 KB Created: 2021-09-25 16:32:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1e7c341a4a3f01724bb9dba34cba7310 SHA-1: 3babf490088fec1eb875e358a9e73568f0a7c415 SHA-256: 087f8f7830ca620d8d76fb95d9e552c77a7c250feeb557f215bbf1e6b7c44a5c
176 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and a machine learning classifier indicated a high probability of maliciousness. Several heuristics indicate the document contains a link farm pointing to potentially compromised WordPress sites and disposable hosting, with one direct link to an IP address. The primary purpose appears to be directing users to malicious external sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://samavetpharm.com/userfiles/files/54906892531.pdf
    • http://bdnchem.com/upload/files/jejekagoromi.pdf
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f332d13a3a---xerifevafisimijiwefu.pdf
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/23d332b02c46d1ba017db68a6aa1e0d3/88206502488.pdf
    • http://dkkarsin.pl/img/upload/files/83410125831.pdf
    • http://shopphutungmayphat.com/upload/img/files/bilebivujatubekuvofiroge.pdf
    • http://vnos.vn/app/webroot/uploads/files/vulumizanema.pdf
    • http://lobanowscy.pl/userfiles/file/japopid.pdf
    • https://andana.us/files/files/donolomulofogu.pdf
    • http://gldbirdgel.com/user_img/files/78366932119.pdf
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f48bcd0bef---31484329472.pdf
    • http://gatewayhotelbangkok.com/upfile_hotel/files/zubakeniwuwux.pdf
    • https://jeneifogaszat.hu/cikkdata/files/77994509768.pdf
    • http://tatnhapkhau.com/ckfinder/userfiles/files/78169200656.pdf
    • https://bloomland.com/sites/bloomland.com/files/dakitufiseluveso.pdf
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/83e7242b57f83b57d17571a1a176a18a/1197934639.pdf
    • http://140.121.180.103/ckfinder/userfiles/files/79897755115.pdf
    • http://hmed.vn/upload/files/14218343936.pdf
    • http://embody.box8websites.com/ckfinder/userfiles/files/vibefuna.pdf
    • https://nsstore.mx/ckeditor/ckfinder/archivossubidos/files/67781051320.pdf
    • http://dptour.net/bot/ckfinder/uf/files/viligawesaretorukunofiroj.pdf
    • https://cashcruis.ru/wp-content/plugins/super-forms/uploads/php/files/a4684d125f415a6ab5f3e63f337bdb3b/52287422999.pdf
    • http://seasonmediagroup.com/pic/file/73376475422.pdf
    • https://onwater.my/uploads/file/46758942843.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=how+connect+mobile+to+led+tv
    • 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_off0000b595.bin
a2b5beb9558943675e3941c54d473221d0d956615eb8b63a28473f4b2441ea0e
pdf-font-stream PDF embedded font (sfnt) at offset 0xB595 10384 bytes
font_01_sfnt_off0000ccfd.bin
f1de7f1503d35ab50fb5f2d79f80cf0b998bd48a7fbea544c116ba8837c871e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCCFD 17160 bytes
font_02_sfnt_off0000f9ba.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF9BA 16792 bytes