Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbc988c4350af25a…

MALICIOUS

PDF

71.2 KB Created: 2021-09-19 03:07:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d87c08fde1795ec349a7a24f1ac23e22 SHA-1: a4c5e50836b456149fd5c244b083b3462fffbeb5 SHA-256: dbc988c4350af25a8f96a98963b4eaa54579294ab94b7ece19281ee61b9eecab
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting. The primary goal appears to be redirecting users to external sites, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://alpinedelhi.com/userfiles/files/fewigisu.pdf In PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16130c5a661902---mijedapamewe.pdfIn PDF document text
    • http://billagelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pexagod.pdfIn PDF document text
    • http://uniquehotelsolutions.com/files/others/motamedejepe.pdfIn PDF document text
    • http://www.drivingschool-brno.cz/files/files/nazekemuteru.pdfIn PDF document text
    • https://khabul.mn/mmpa/userfiles/files/49874900269.pdfIn PDF document text
    • http://ncfc.com.tr/ckfinder/userfiles/files/xovotadenuwijutol.pdfIn PDF document text
    • https://digireg.org/upload/19442916534.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/161466a540dab6---siwakewakedumimunegojojax.pdfIn PDF document text
    • https://zoomkish.com/basefile/zoomkishcom/files/tekimeduwikojaxanugakadup.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16144837e56ccf---rozokex.pdfIn PDF document text
    • http://rsst77.ru/upload/files/58795981811.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16139ca4af0cea---74830887501.pdfIn PDF document text
    • https://tootooair.com/FileData/ckfinder/files/20210913_9E904DEA4804A9EA.pdfIn PDF document text
    • http://artkulinaria.pl/sites/default/files/file/91342928101.pdfIn PDF document text
    • https://biogenetixpharma.com/ci/userfiles/files/90224721153.pdfIn PDF document text
    • https://tanthueviet.vn/img_data/files/kulebipufok.pdfIn PDF document text
    • http://pmke.cz/pictures/files/16713248369.pdfIn PDF document text
    • http://levant-tekstil.com/other_files/File/13718804368.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/88b57ccd2f40508a3ea0c28e3248692f/gogudokigaku.pdfIn PDF document text
    • http://koreabulk.net/userData/board/file/dusiwaze.pdfIn PDF document text
    • http://dansecyr.ca/pdf/file/pozijisapegetoxetiwuvi.pdfIn PDF document text
    • https://www.koreayokogawa.com/ckfinder/userfiles/files/lovepalareka.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=cheat+for+flying+car+in+gta+san+andreasPDF 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_off0000b785.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB785 15116 bytes
SHA-256: c6ced724c9af5c20e0a6b6a0e18998fdbfb9bac10ad325a29efd4cf03549eaee
font_01_sfnt_off0000dda0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDA0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f5b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B7 10900 bytes
SHA-256: 03784598b35bca979d4b143347aa00e779264ce81e248d8e30e59814df4cbfa6

Open this report in the interactive analyzer, or submit your own file for analysis.