Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd6e2e6aa05bb248…

MALICIOUS

PDF

81.1 KB Created: 2021-09-08 03:21:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e5a5da2d2e7d9d41e7e5e49a4e698aa9 SHA-1: e3e6263f0496246ac2656697f60f1dcc527a105e SHA-256: dd6e2e6aa05bb2482d28e90171118d5006808ae386b878f046c2f2224472c1b7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the URLs and the heuristic firings point towards a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://medvor.ru/uplcv?utm_term=find+limit+from+graph+worksheet PDF link annotation
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/73cd2bf6e877ef5f87ef62405ee35552/vulalejedanuw.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/16083a83d234d1---zujutitov.pdfIn PDF document text
    • http://yuc-fac.com/uploadfiles/20210718223706.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160967be482a67---toxudededoxelapitanutuxu.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/96iekq1pn1jgist5pdmgg2l9m1/55505156097.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160fdcae7a5119---nujenidiji.pdfIn PDF document text
    • https://stehovani-ostrava.cz/static_pages_files/file/tesobel.pdfIn PDF document text
    • https://inks.bg/userfiles/file/50717502427.pdfIn PDF document text
    • https://iphonerepairservice.nl/app/webroot/files/userfiles/files/biwuworame.pdfIn PDF document text
    • http://michelesherrinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lopewifakedumunaluzuma.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160b60b7382e86---43038438347.pdfIn PDF document text
    • http://olympicthesportshop.in/uploads/lozumimez.pdfIn PDF document text
    • https://alsultantrading.ae/userfiles/files/65329793462.pdfIn PDF document text
    • http://shuimotongyuan.com/userfiles/file/fabuzu.pdfIn PDF document text
    • https://fotofidelity.cz/userfiles/file/vuxij.pdfIn PDF document text
    • http://dotacjedlaoze.pl/userfiles/file/45738527222.pdfIn PDF document text
    • http://stowarzyszeniemalyksiaze.eu/img/upload/files/duboj.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/20c08474108ef9117833b774ca50a0bb/71561151336.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/temudovezijuzaxuwiju.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/161107cc69b5c9---minonanevofixuwugajuj.pdfIn PDF document text
    • http://tnslib.net/userfiles/files/41082307162.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160939f457a98c---80272261143.pdfIn PDF document text
    • https://knurussian.kr/DATA/upload/files/202108031610259422.pdfIn PDF document text
    • http://interel-rus.ru/test/sites/default/files/file/bidesaretixodope.pdfIn PDF document text
    • http://medtravel.pro/images/hand_uploaded/files/82334870382.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_off0000d997.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD997 11100 bytes
SHA-256: 7faddfa2dc9fc735d144edcdffd545840241fad5dc45abcaa17f461b05e2a951
font_01_sfnt_off0000f313.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF313 16812 bytes
SHA-256: 447e50286f46090f56d4aa0309b558c662a7d4cbddff04021d5859cab163bab9
font_02_sfnt_off00011e88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E88 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1