Malicious PDF — malware analysis report

Static analysis result for SHA-256 63db2382fe2c24da…

MALICIOUS

PDF

84.4 KB Created: 2021-09-18 21:44:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4c3c49ff7b97e8161637674b50f0632a SHA-1: 5cf316db12d64185c9654d8527549dd95dac0f6f SHA-256: 63db2382fe2c24da326d22ab0ce65fee0890b998e52a615afc82bdac7b0a10ae
164 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised and disposable domains, indicative of a link farm designed to host malicious files. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The presence of a 'download button' heuristic further supports the lure mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://abakus-routing.co.uk/ckfinder/userfiles/files/1709512416.pdf In PDF document text
    • http://ateliergermain.club/sites/default/files/file/41431078674.pdfIn PDF document text
    • http://lube-stc.com/ckfinder/userfiles/files/pabejadezagudemuduw.pdfIn PDF document text
    • http://sotel-perm.ru/site/file/bikejanojofa.pdfIn PDF document text
    • http://jsushibrea.com/uploads/files/61619028716.pdfIn PDF document text
    • http://volkshilfe-vlbg.at/images/content/files/53271639519.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/161405bd106f62---13754466540.pdfIn PDF document text
    • https://molecult.metallo-tests.ch/sites/web/upload/files/genijikifusagis.pdfIn PDF document text
    • http://metallpress.ru/files/tumaniru.pdfIn PDF document text
    • https://magnanelli.com/userfiles/file/6947432291.pdfIn PDF document text
    • http://www.trisad.kz/ckfinder/userfiles/files/vumazemofodet.pdfIn PDF document text
    • http://brukikostka.pl/uploads/page/file/waluvijaworimep.pdfIn PDF document text
    • http://mobiliteit.nu/files/kesenixetutowize.pdfIn PDF document text
    • http://birkhoffhi.com/userfiles/files/84191070141.pdfIn PDF document text
    • http://vanprodukt.cz/UserFiles/File/17125175639.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/161428916774a5---40108810322.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/8fd05ccd5ed4104b6571b949313ea4f0/1683357235.pdfIn PDF document text
    • http://farashimirooz.com/files/taridupi.pdfIn PDF document text
    • https://sunpower.lv/ckfinder/userfiles/files/14965213099.pdfIn PDF document text
    • https://watertorens.nl/userfiles/file/wofaluremilefodunigo.pdfIn PDF document text
    • https://biomedchita.ru/imeg_master/file/581495836.pdfIn PDF document text
    • https://soportedevida.mx/ckfinder/userfiles/files/ludurebulakit.pdfIn PDF document text
    • http://sochi-riba.ru/ckfinder/userfiles/files/tudalanarapuga.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=tamilrockers+movie+download+isaiminiPDF 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_off0000e666.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE666 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE7D 10640 bytes
SHA-256: 4aade4c76a3e71c3e191b2b42c3a4c27985c30942a3feebade10457eb93d46df
font_02_sfnt_off000116d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116D6 17256 bytes
SHA-256: 6a035eb222f71bd502b08564137c9eff883ae064c0b6d4a382839c1cbadcb560