Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f7052086d0676da…

MALICIOUS

PDF

93.3 KB Created: 2021-07-13 05:10:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1adad753d4a3ba9d01e3360d6247e77a SHA-1: 49fa984555781e9244caebf6d5ccb6447c7bbf14 SHA-256: 1f7052086d0676daee199a43cb2f4d5712cc678f494f3379fbf6ea440c42a388
156 Risk Score

Malware Insights

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

The sample is a PDF identified as malicious by ML classifiers and ClamAV. It functions as a link farm, containing numerous URLs pointing to various domains, some of which are hosted on compromised CMS upload directories. The presence of multiple external URIs and link farm characteristics suggests an attempt to redirect users to potentially malicious sites for phishing or further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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://curry-box-deluxe.de/userfiles/file/52218298071.pdf
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3bd7c4754f---fumaxetunemuvulaxepira.pdf
    • http://biosurfest.com/userfiles/files/vipevapobawopeporikurewog.pdf
    • http://beijingxinzhi.com/userfiles/file/20210621131645_1755170573.pdf
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/dbbde4bdb102fe5046095b719e2e522e/gotatiniwagi.pdf
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/c3036ac1b4012fee9589a83f931e1bbf/517377791.pdf
    • http://antifftech.com/uploadfile/file///2021052308474022.pdf
    • http://kojeneckezbozi.eu/userfiles/file/napukixawipulavule.pdf
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/6fbae884bac5c57cda7b1ff3dda233f1/balamusorepezuromegiserib.pdf
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091b80868437---3493488841.pdf
    • https://abofahed.com/userfiles/file/50710568366.pdf
    • http://agataklimowska.pl/userfiles/file/43347192030.pdf
    • https://bloomland.com/sites/bloomland.com/files/54625321146.pdf
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609700324a4bc---fafofulitugorenolo.pdf
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608475d3bb2fd---95483734562.pdf
    • http://seoulsquare.com/userfiles/file/64678668077.pdf
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160cfc727975b6---terukudoduzegikuvimo.pdf
    • http://curry-box-deluxe.de/userfiles/file/rerodelugumukadebulonopu.pdf
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/qu75fh86tt874nouh6dvvejboo/luwawatotepog.pdf
    • http://hasyo.net/files/file/23481985965.pdf
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/4837f36ab188652c83ea99c37a457291/xasaxumoru.pdf
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/eghrq4na05hkp47gp0fmchcon4/96786765219.pdf
    • http://stewartreunion2020.com/clients/2/2a/2a0d9dcdd57715375c9f4393c24df0f2/File/15247875040.pdf
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/c0287cdb6ae983354d45a0e4d990febc/87881257156.pdf
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/9b3g5n6aomrtalq2kra10ht6q9/92713087476.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=the+millionaire+mind+pdf+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa4f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA4F 16792 bytes
font_01_sfnt_off00011266.bin
732675ba746d5a7f22cb283edcb1ae9ace0cdf6c1e8305584259d58ccf912c90
pdf-font-stream PDF embedded font (sfnt) at offset 0x11266 10548 bytes
font_02_sfnt_off00012a26.bin
29301089d155cb59ad13d96f99e3c65b574ae5e04961432ae4c17427898905d1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12A26 2828 bytes
font_03_sfnt_off00013631.bin
a51993887ce20cf4ba18fe7f320a16f9f1896c2adfa1d08bc9544668d6d4e005
pdf-font-stream PDF embedded font (sfnt) at offset 0x13631 18112 bytes