Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bb5f0e9a17acff1…

MALICIOUS

PDF

80.6 KB Created: 2021-09-16 04:42:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 7215d70e55657b9353fcce893bf8657f SHA-1: 61aa2d9e2d64bc6365b9252bfca3e92845515c5a SHA-256: 5bb5f0e9a17acff100bb09fd70dbb511b5764f005814fcaa9f55057dc0cb2bfe
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The document body was unreadable, but the presence of numerous external links and the 'link farm' heuristic strongly suggest the primary goal is to redirect users to malicious sites.

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://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/3dccf7d6ad968bad24e089a466dd969e/kufalimalonaravosegonotaj.pdf In PDF document text
    • http://na-bytecek.cz/UserFiles/File/jivawevefobivezotonoz.pdfIn PDF document text
    • http://omeofest.eu/userfiles/files/64698390542.pdfIn PDF document text
    • http://bolshunoff.ru/images/wysiwyg/file/fixeso.pdfIn PDF document text
    • https://beyondpins.com/calisma2/files/uploads/juzibavarejakupapezoret.pdfIn PDF document text
    • http://csc010.com/userfiles/file/20210901082427_y1rhik.pdfIn PDF document text
    • http://daehwa.info/uploaded/file/13472945865.pdfIn PDF document text
    • http://malovanesklomh.cz/images/file/gotizaz.pdfIn PDF document text
    • https://ncsccalgary.com/userfiles/files/57276810908.pdfIn PDF document text
    • https://getadoc.in/ckfinder/userfiles/files/jadenivuzezavex.pdfIn PDF document text
    • http://fizjoactiv.eu/Upload/file/kuwewuwabomiresivamuzem.pdfIn PDF document text
    • http://stroytehcentr.ru/images/file/zakowekitovowulenevugo.pdfIn PDF document text
    • http://darec.sk/files/files/bezagujejisasufuwuj.pdfIn PDF document text
    • https://nibrasimansch.com/userfiles/files/5220111351.pdfIn PDF document text
    • http://balashixa.inhome360.ru/admin/ckfinder/userfiles/files/fojawexurarulododutag.pdfIn PDF document text
    • http://thibidi.vinadesign.info/uploads/images/files/dekofuzeki.pdfIn PDF document text
    • http://theponghop.com/upload/files/sugobebu.pdfIn PDF document text
    • http://ucg-eg.com/userfiles/file/wiroguwe.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/161420b1506d82---ralawemudugelugus.pdfIn PDF document text
    • http://aunay-sous-auneau.fr/ckfinder/userfiles/files/48467039462.pdfIn PDF document text
    • http://stapper.de/sites/default/files/userfilesfile/zoxewuketofewofuxiwo.pdfIn PDF document text
    • https://aiwcecckolkata.org/FCKeditor/file/69895319455.pdfIn PDF document text
    • https://kstraders.com/userfiles/file/20805583705.pdfIn PDF document text
    • http://someteme.com/archivos/_20210915215855.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16133fa0dad1de---88989386962.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=marvel+vs+capcom+2+download+apkPDF 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_off0000d6ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6EC 10844 bytes
SHA-256: 0bc967c50480b7be376f335913ee99a89238c481d3f4440f4ae4fad321b32c12
font_01_sfnt_off0000f012.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF012 17144 bytes
SHA-256: 1aa182b52a97cf1c05e5ff779d8fcc9eb737c96d5172bd82363f183035f05993
font_02_sfnt_off00011cca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CCA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1