Malicious PDF — malware analysis report

Static analysis result for SHA-256 877e1c6f77338682…

MALICIOUS

PDF

84.5 KB Created: 2021-09-21 12:26:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1789b7732bc1b2effad0fb09efe67ea5 SHA-1: 179f92cc058f01f2ae5c45cf18cef9b1a39a7c2a SHA-256: 877e1c6f77338682d5dfe634ba56d6004687e647c3d4bcd44bdd8814008dd44f
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs that point to various domains, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of 'link farm' heuristics suggests the document's primary purpose is to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://crewmak.ru/uplcv?utm_term=best+free+car+games+for+android PDF link annotation
    • http://hoteldanang.com/uploads/images/files/89797047843.pdfIn PDF document text
    • http://fotosvatba.net/userfiles/file/peliniwijesemos.pdfIn PDF document text
    • http://sadiqandsons.com/userfiles/files/jokegirelisukodonazi.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/wowawozaduzoxojerosora.pdfIn PDF document text
    • http://ejmk.com/ej/upload/files/71981795862.pdfIn PDF document text
    • http://pharmorgsyn.com/upload/files/zuvol.pdfIn PDF document text
    • https://tucarrorentacar.co/ckfinder/userfiles/files/zitixidinusovodobawopum.pdfIn PDF document text
    • http://demkapi.com/resimler/files/48380283310.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/70d11706668940f5abbd10d94443c4e2/4454510685.pdfIn PDF document text
    • http://edu-soft.ru/site/htmlimages/file/56080920392.pdfIn PDF document text
    • https://kanat.com/upload/ckfinder/files/xulun.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/b0ec57e0f776b7b71468266c3786afae/bamalilus.pdfIn PDF document text
    • http://saddabro.com/userfiles/file/rusaroxajasaj.pdfIn PDF document text
    • http://xn--12cm8caae5d9a0a0a1dxk6dd.com/user_img/files/kenolijafikomebani.pdfIn PDF document text
    • https://vinatech.com/userfiles/file/78068756274.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/55131538575.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614498cd5fa25---12257485149.pdfIn PDF document text
    • http://culbertsonlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/36358600605.pdfIn PDF document text
    • http://phuketdriveschool.com/userfiles/file/8706525909.pdfIn PDF document text
    • http://custom-mugs-factory.com/uploadfile/files/51079005020.pdfIn PDF document text
    • http://xn--franzsischebulldoggen-lec.eu/userfiles/file/10299176666.pdfIn PDF document text
    • http://desiaussies.com/ckeditor/uploads/files/7278477450.pdfIn PDF document text
    • https://bjjewels.net/nbloom/fckuploads/file/75109236667.pdfIn PDF document text
    • http://motocams.cz/ckfinder/userfiles/files/81032372676.pdfIn PDF document text
    • http://kamerton.nl/clientfiles/96174210772.pdfIn PDF document text
    • http://studiovalentini.eu/userfiles/files/89527970514.pdfIn PDF document text
    • 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_off0000e572.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE572 10828 bytes
SHA-256: 9c136e1fe7a525461b75355ba4cfb3bb33f47f9135ce7cc705c00b09d3f9485d
font_01_sfnt_off0000fe45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE45 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011657.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11657 17604 bytes
SHA-256: 18725612b56b26659824f1f055683a44fc13030ff6c34450c670042cfc9abe89