Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6ca0ea297e5baa3…

MALICIOUS

PDF

82.5 KB Created: 2021-09-14 02:36:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a5bdca1ef1b5836f2c94b2711da2750e SHA-1: a31c4eda96e784214b9b1a5944386841e95da182 SHA-256: c6ca0ea297e5baa3c7bc5df9e492e20ed455fe11cd932409b3e09b68216c73c5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external links, with several pointing to compromised CMS upload directories, suggesting a phishing or redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links. No scripts were extracted, and the document body was unreadable, limiting further analysis of specific payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://vitanov.rs/files/84712451296.pdf In PDF document text
    • https://matfplayer.com/calisma2/files/uploads/sugamuzojemigemef.pdfIn PDF document text
    • https://123natura.com/stockages/files/duzaxavewitijabuxedi.pdfIn PDF document text
    • http://aurastaffing.es/upload/file/jewufisiboromavakunapawu.pdfIn PDF document text
    • http://thietbiotovn.com/Images_upload/files/wuxupeberuxobarojosep.pdfIn PDF document text
    • https://prawobrzeze.info/userfiles/file/18676034641.pdfIn PDF document text
    • http://pradakshinam.com/fck_uploads/file/51574198543.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/65265021041.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bf42cf3702---nixalakigiji.pdfIn PDF document text
    • http://oresteruggiero.com/userfiles/files/26812339815.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/l3e8o3jgmaf1mf59oskmlnmhrk/41318312957.pdfIn PDF document text
    • http://websteravelandscaping.com/editorData/file/miveginuxotusewonaj.pdfIn PDF document text
    • http://modernplating.com/userfiles/file/tufomikugabuzij.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fe015d270d---71659678806.pdfIn PDF document text
    • https://lecormier-menuiserie.com/www/upload/files/retupotezazubamonufa.pdfIn PDF document text
    • http://johndanton.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/duvawakoxovuse.pdfIn PDF document text
    • http://bjsixiang.com/jingkelun/userfiles/files/20210908030427.pdfIn PDF document text
    • https://polaria.cz/images/file/2254518337.pdfIn PDF document text
    • https://slide-bearing.com/d/files/zujefimejinape.pdfIn PDF document text
    • https://unicon-msk.ru/data/files/lomubebu.pdfIn PDF document text
    • https://projekt-lesen.de/userfiles/file/ziruxunoba.pdfIn PDF document text
    • https://sayurmateng.com/contents/files/54733973281.pdfIn PDF document text
    • http://fatename.com/uploads/files/202109012256411566.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16136acd97c1cb---pijaxoziv.pdfIn PDF document text
    • http://architettodrabeni.it/userfiles/files/piseliwon.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=watch+tv+series+streamPDF 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_off0000e131.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE131 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f943.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF943 16912 bytes
SHA-256: 33d26804c0fa8cf14f3104e4c8961ae3eafcd765f662ce40c9ea440fd9a8eb7b
font_02_sfnt_off00012530.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12530 10284 bytes
SHA-256: 0d7bf99e9b8248c0f39f86c26cc68f5948821135535f4894dccb469dccddb22a