Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c8da35e6f0a0932…

MALICIOUS

PDF

78.8 KB Created: 2021-09-13 03:03:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 915ffef8b4ff13fe2fca15970abb0aaf SHA-1: 0a89edf93326ee6bff0c0478267072c7d63fea84 SHA-256: 7c8da35e6f0a093293255764e07401fe9373c6f17cc8710f67f6d5c183069a1d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many embedded URLs pointing to compromised WordPress upload directories. The primary purpose appears to be redirecting users through a series of links, likely leading to a phishing or malware distribution site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613e86621bb7f---48064318102.pdf
    • http://eortak.com/img/fck_temp/file/36786407735.pdf
    • http://abwlanham.com/uploads/files/lalaguvopexu.pdf
    • https://kit-veron.my/ckfinder/userfiles/files/jotikedoxap.pdf
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dcc570ee5f---50791206268.pdf
    • http://utpcomp.ru/uploads/files/nomozuperogibokemaze.pdf
    • https://assignmentmart.com/ckfinder/userfiles/files/96360534845.pdf
    • https://sedefartphotography.com/resimler/files/memerejajirizenipogo.pdf
    • http://losmarinoslanzarote.com/marinarubicon/admin/file/parover.pdf
    • http://easternhoteljeju.com/FileData/ckfinder/files/20210904_DB12936F261F050B.pdf
    • http://sqc.jp/user_data/editor/ckfinder/core/connector/php/upload/files/batenewuwunevixopoboxu.pdf
    • http://younewstoday.com/task/userimages/file/22455722115.pdf
    • http://virus-safe-zone.com/ckupload/files/foloxa.pdf
    • https://jcmimoveis.com/userfiles/file/21017793495.pdf
    • http://kdbelektrotechniek.nl/uploads/file/36382086721.pdf
    • https://zohopin.com/calisma2/files/uploads/tonezubamofegimi.pdf
    • http://dbexpertise.fr/catalogue_dynamique/file/fowuzabetifoxibixu.pdf
    • https://www.ebenisterie-burette.com/ckfinder/userfiles/files/66171636148.pdf
    • https://kham.vn/userfiles/file/gofabulokalufeza.pdf
    • https://insinkerator.us/images/uploaded/file/jeraguduvuwujozadovi.pdf
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/3e27fa5b5c2e2cdb50e0528d5f00ff54/84524042385.pdf
    • http://drtamerturan.com/file/30250006225.pdf
    • https://mahae.hu/files/files/jakobiwafixoxi.pdf
    • http://okmarin.ru/userfiles/file/nodijazuxifoxaridum.pdf
    • https://aparcaderoshaddaichile.cl/uploads/images/files/zufinu.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=jpg+to+pdf+mac
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d079.bin
a67d6b7e46ab81b2d23d1e5a4ebb02697da9e6073a60a3290caa7d30e7aaae12
pdf-font-stream PDF embedded font (sfnt) at offset 0xD079 18196 bytes
font_01_sfnt_off0000fefb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFEFB 16792 bytes
font_02_sfnt_off00011712.bin
3501d50ddb4d37c6a2ed4671cfdaba11a9aacd049ab33fe78ef896e549b072f6
pdf-font-stream PDF embedded font (sfnt) at offset 0x11712 10312 bytes