Malicious PDF — malware analysis report

Static analysis result for SHA-256 82f1b4dc5e03efe3…

MALICIOUS

PDF

83.2 KB Created: 2021-09-12 03:20:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 04bfb48fc904d75ede4c1c155ef92565 SHA-1: ec6cc4292d7c908041c3b4644500a6af24dfd4c6 SHA-256: 82f1b4dc5e03efe3363cae6ed4b179e26fe7af1d7a788314ba6908d6615f6afc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious PDF lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 https://queure.ru/uplcv?utm_term=crossword+mysteries+riddle+me+dead+putlocker PDF link annotation
    • https://paulogomeslda.com/userfiles/file/xuxozofobijoluwajekafu.pdfIn PDF document text
    • http://phongthuyphatloc.com/luutru/files/mobewuri.pdfIn PDF document text
    • https://wtmasonry.com/ckfinder/userfiles/files/gefofegeduruja.pdfIn PDF document text
    • https://stomatoloska-ordinacija-rijeka.com/files/sevot.pdfIn PDF document text
    • http://esen.life/userfiles/file/sabumitizinekodawakojajep.pdfIn PDF document text
    • https://bostoncake888.com/UserFiles/files/74215007051.pdfIn PDF document text
    • http://www.predia.cz/userfiles/file/59643309341.pdfIn PDF document text
    • http://naasschoolofmotoring.ie/fckeditor/userfiles/file/22656286560.pdfIn PDF document text
    • http://saothienemb.com/uploads/images/files/48167787871.pdfIn PDF document text
    • http://jikaramen.com/uploads/files/75337174588.pdfIn PDF document text
    • http://energy-labels.nl/userfiles/file/wilogaw.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/254c1e575032ec326b9c4e66c2c61725/romuxugejubosuwinizipidad.pdfIn PDF document text
    • https://ruta.hu/ckfinder/userfiles/files/favixosixedo.pdfIn PDF document text
    • https://discovercefalu.it/_data/images/file/32263194940.pdfIn PDF document text
    • http://debnine.net/UserFiles/File/damojonalemuxafujorututed.pdfIn PDF document text
    • https://angem.fr/userfiles/file/dosizadugamiwi.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16133d344e0c95---41478948186.pdfIn PDF document text
    • https://ontogepszerviz.hu/editor_up/biberozugu.pdfIn PDF document text
    • http://thewesternmist.com/userfiles/file/vegebo.pdfIn PDF document text
    • http://mn-print.ru/ckfinder/userfiles/files/21973450114.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1613c0c9055a4c---wudawulaxomigonepowu.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_off0000df15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF15 10992 bytes
SHA-256: e3c26ce948ef8a04f1c1e8ceb9010482d25f38e352b12c51e4dc56274c7700b2
font_01_sfnt_off0000f8bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8BD 18168 bytes
SHA-256: 25514b31e1b2d79d11f318626d1b61bb2c517a31290939043e8c5967c5d3bc36
font_02_sfnt_off000126e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1