Malicious PDF — malware analysis report

Static analysis result for SHA-256 40a95e876821b73e…

MALICIOUS

PDF

94.5 KB Created: 2021-07-31 05:49:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 87635ce3bcd0673c9764d0710b28830d SHA-1: ee4c1bd8ca6a17cc9a40605586e6710b139427e6 SHA-256: 40a95e876821b73e1c4af65356eb453a7c1556e63345d94853f95ca72593ef56
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the PDF contains a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress installations. One specific URL, http://ledesmasportsmedicinesavannahcentury.com/clients/4/44/449a5b3489ef279447e90cf6cdd72f1c/File/lalukelejisaze.pdf, is flagged as a random URL link, suggesting it is a primary distribution point. The presence of embedded URLs and the nature of the link farm suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/fb4016f63fb5daaba776898bd0504fc3/xakugo.pdf In PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/883684dc7021d711d293354b51aa3237/lefisewigixarepiw.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092ecab77415---98590939773.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ac69315749---19487785595.pdfIn PDF document text
    • http://gintaras.cz/userfiles/file/kevamobuvuluturelo.pdfIn PDF document text
    • http://ledesmasportsmedicinesavannahcentury.com/clients/4/44/449a5b3489ef279447e90cf6cdd72f1c/File/lalukelejisaze.pdfIn PDF document text
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/io2ruoeojp6dgfm5o8eigocae2/71439572920.pdfIn PDF document text
    • http://princeworldwide.com/multimedia/userfiles/file/nibexari.pdfIn PDF document text
    • http://www.barbazan-debat.fr/ckfinder/userfiles/files/jitizo.pdfIn PDF document text
    • https://amatnieks.lv/pictures/image/zujekotevodet.pdfIn PDF document text
    • http://safires.cz/ckfinder/userfiles/files/vibubobod.pdfIn PDF document text
    • http://ghioroiu.ro/sites/default/files/file/pedubupab.pdfIn PDF document text
    • https://takeorders.online/wp-content/plugins/super-forms/uploads/php/files/iqn41n9ohgb230f9oahdgub06v/fejadagogilubixu.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/160e4d52a8899e---32763451961.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/2f5d0e9cfd07eac10151eca3f451f3e5/387456261.pdfIn PDF document text
    • https://bawaniint.com/ckfinder/userfiles/files/98741625462.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/7eapfqj82s27sl8fsm0fsv0l3f/pixixaderif.pdfIn PDF document text
    • http://www.trisad.kz/ckfinder/userfiles/files/36027133954.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/eb34c67fd8f86b97b0344e9c3c493714/16079512672.pdfIn PDF document text
    • https://club-sports.net/uploads/products/files/31641725383.pdfIn PDF document text
    • https://xn--hjrnskadeakademien-mtb.se/userfiles/file/zefiruxelumamodemapokemaz.pdfIn PDF document text
    • http://praguetransfer.com/files/file/16033427748.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=seat+leon+workshop+manual+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010aab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AAB 11024 bytes
SHA-256: a5756726bdee098051c644e550c5988bafe1d4ff32eb0a67e026c29470293ce2
font_01_sfnt_off00012432.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12432 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013c44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C44 19180 bytes
SHA-256: 604101a4e2010ee2086ebad66a5295f49c1328ec5d25207908409ee18bff3456

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