Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f6d25a3445ac7f0…

MALICIOUS

PDF

83.3 KB Created: 2021-09-17 18:01:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0927c439a85d9a2715acfe578c6b2ff5 SHA-1: 7e9edefab37eb8273310b133b9155331ad972a39 SHA-256: 7f6d25a3445ac7f0efb3c71884b6cd3dbb3db7699e936aa76e0ab14c5a59d928
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically identified as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to external sites. Some of these URLs are hosted on compromised CMS uploads or disposable domains, suggesting a tactic to obscure the true destination and potentially distribute further malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://cructi.ru/uplcv?utm_term=android+10+record+calls PDF link annotation
    • https://beytarimcilik.com/admin/editor_resim/file/18119852693.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/g9n2pqnms6puh44k8chamk46as/3525586958.pdfIn PDF document text
    • http://poptheme.cn/uploadfile/files/20210910_180046.pdfIn PDF document text
    • https://leganordavigliana.it/uploads/file/81730085623.pdfIn PDF document text
    • https://cargotavio.ru/files/file/tekirediwiberogofonu.pdfIn PDF document text
    • http://angerdress.store/ckfinder/userfiles/files/zenawe.pdfIn PDF document text
    • https://tarzminder.com/resimler/files/boparekujoxakuwased.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/pcv56p77us30htk85d5cpnfkgk/vuloxofexaluvuv.pdfIn PDF document text
    • https://heritran.vn/uploads/news_file/39064651071.pdfIn PDF document text
    • https://sunnyrosesschool.com/userfiles/file/rapuguwununilufime.pdfIn PDF document text
    • http://ouhkpthaa.org/userfiles/videpujedit.pdfIn PDF document text
    • http://autosvilar.com/uploads/ckfinder/files/23962379773.pdfIn PDF document text
    • http://ingatlantv.tv/userfiles/files/5221388803.pdfIn PDF document text
    • https://rsvforum.com/userfiles/file/86549269942.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/4056f92e595d96a880d68e70f8b2b81f/58997444665.pdfIn PDF document text
    • http://tofuyatogo.com/uploads/files/69848069345.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136a9fc12031---34602645741.pdfIn PDF document text
    • http://teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/fewibuxevozebuva.pdfIn PDF document text
    • https://leise.ru/admin/ckfinder/userfiles/files/nogox.pdfIn PDF document text
    • https://perfectsextherapy.com/public_html/userfiles/file/48255396644.pdfIn PDF document text
    • https://www.ewdel.cz/ckfinder/userfiles/files/36911374426.pdfIn PDF document text
    • http://praguetransfer.com/files/file/10147142841.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_off0000de84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE84 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f69b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF69B 10420 bytes
SHA-256: f93789522b98371997ffd0a1f47be5e16c6d2f62ab1a586bb80ad8d856c4f429
font_02_sfnt_off00010e51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E51 19036 bytes
SHA-256: 55b66c1d66ba656ad11a9c94153516b00db6beb0c510c3e10b0d2538cf75d14b