Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c5bfb929a338727…

MALICIOUS

PDF

73.7 KB Created: 2021-09-02 21:29:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: da78bbac0129705a0fb150ca772d0489 SHA-1: 9e1cbcd4977525ca2bc84783466c7b0bfd8d6721 SHA-256: 2c5bfb929a338727a4385c2c2134db603edf84c65d8f6d528472bdfafd57fe67
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple websites, some of which appear to be compromised. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to download a password-protected archive, a common tactic to bypass gateway security. ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature. No scripts were extracted, limiting the analysis of direct execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://dabbleanddesign.com/clients/c/c6/c60e280709801842a26e47e23f21f170/File/tanipavet.pdf In PDF document text
    • https://www.bevillelecomte.com/ckfinder/userfiles/files/tesetuwesoxowalarewodig.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4e9c6e7aa3---76759753557.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/kularatejibupe.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/ede213c16b51a87e8f86e08a7ed72c33/gozizazukutopekovojesutur.pdfIn PDF document text
    • http://worldtile.net/jangheung/userfiles/file/3964891094.pdfIn PDF document text
    • http://symbioticlifetech.org/attfile/fckimg/file///20210523135023_250894562.pdfIn PDF document text
    • http://csc-0411.com/userfiles/file/20210622185147_fv9uj3.pdfIn PDF document text
    • https://electroagro.es/pub/files/menutakabukalenepadata.pdfIn PDF document text
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/a2df1c2b89beea739aa394a980dbb129/7523693033.pdfIn PDF document text
    • https://chaplains-camps.org/upload_picture/file/sazuz.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b16a4f2b037---86524523940.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/in68r1kjjv2clm6kj962kjhmhs/tidolasipexanefadawene.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/hh85gvhtgrcbc1s6jfcu598s6t/36407450159.pdfIn PDF document text
    • http://tragiaocolamsapa.com/userfiles/image/file/18942355291.pdfIn PDF document text
    • https://retake.dk/ckfinder/userfiles/files/87586513795.pdfIn PDF document text
    • http://andrelandberg.com/userfiles/file/zodazoxosowixofi.pdfIn PDF document text
    • http://xn----8sbemnkjd7bfu.xn--p1ai/design/img/upload/file/7604614477.pdfIn PDF document text
    • http://teplolux72.ru/upload/file/97515867401.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a8bfbe05790---tupisasepiwatevinajudilif.pdfIn PDF document text
    • https://soechi.id/userfiles/file/gekewewo.pdfIn PDF document text
    • http://optimumnieruchomosci.pl/uploads/userfiles/files/13148475869.pdfIn PDF document text
    • https://kochitaxirental.com/ckfinder/userfiles/files/welozipobisaj.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/b05aa6867c3a8c7558ab533f3cc796aa/73911654406.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=neurological+assessment+physiotherapy+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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bf5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF5F 15392 bytes
SHA-256: ac32bb16df51662d4e6e178c27bb3b97b49a4d4e2c2b1b099af6e6e76f9a1e20
font_01_sfnt_off0000e68c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE68C 11256 bytes
SHA-256: 8f96ae96515829f551b3ef6a1073e3911ee1baad5400b2152bd7191d2ead7670
font_02_sfnt_off00010098.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10098 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1