Malicious PDF — malware analysis report

Static analysis result for SHA-256 d74b299eab630646…

MALICIOUS

PDF

79.9 KB Created: 2021-09-20 11:01:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e5f5f87b43dbbc4bbe5485214310a594 SHA-1: 5f25e49f26e1eddf909949e62631d7df02b1579d SHA-256: d74b299eab6306467ec574af82ba4c48699a940a3c69e79793e31f31466d996e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URLs, many of which point to compromised websites or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for executing malicious code within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://pistant.ru/uplcv?utm_term=more+effective+c%23+pdf PDF link annotation
    • https://jagamimpi.org/contents/files/65247994156.pdfIn PDF document text
    • https://phuketwebstudio.com/ckfinder/userfiles/files/sixogovotalebefupazutexoj.pdfIn PDF document text
    • http://acelybio.com/upload/files/84333837323.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613e15603a339---54107781652.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613f1214ab8cb---gokal.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/0btao9reut32mpuokrtseh7kqi/85788231242.pdfIn PDF document text
    • http://hkalc.com/userfiles/doreko.pdfIn PDF document text
    • https://manage3.realtourvision.com/rtv/ckfinder/userfiles/images/files/72469721759.pdfIn PDF document text
    • http://headrepublic.pl/images/files/janilobavemurevebad.pdfIn PDF document text
    • http://av72-reklama.ru/userfiles/file/1631804016be0e32caa2e1fc7530b7.pdfIn PDF document text
    • https://www.pepinieres-gey.fr/ckfinder/userfiles/files/sigix.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/2021919225449142.pdfIn PDF document text
    • http://eiak.org/upload/editor/files/povelofeweraziwozijeb.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16131b707d5852---vofuxofas.pdfIn PDF document text
    • http://huh.hu/UserFiles/File/papenaxupaxurufaziw.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/27d84bc496cdedc04831b34b04740621/risomove.pdfIn PDF document text
    • https://oazapiekna.com/zdjecia/fck/file/72070193773.pdfIn PDF document text
    • https://inprovitperu.com/ckfinder/userfiles/files/xigogiturane.pdfIn PDF document text
    • http://sunnysolutions.it/uploads/assets/file/dazavukafavesojuneradetop.pdfIn PDF document text
    • http://eyupsifalibitkiler.com/resimler/files/wisegoduxaxo.pdfIn PDF document text
    • https://corumosmanlimakina.com/js/ckfinder/userfiles/files/42495460238.pdfIn PDF document text
    • http://xedaptheduc.net/app/webroot/uploads/files/biseb.pdfIn PDF document text
    • https://rallstarawards.us/nbloom/fckuploads/file/95701411132.pdfIn PDF document text
    • https://clifestyle.net/uploades/userfiles/file/biletosupiv.pdfIn PDF document text
    • https://alhurwallpaper.com/Files/files/62314614418.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_off0000d5f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE0F 9908 bytes
SHA-256: 4eab042c686aecaf57c48991f57459784efed17a494af9e635c847c44ff6e531
font_02_sfnt_off00010410.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10410 17576 bytes
SHA-256: 3c00c086a8016a951cdfe8d62ad2ddcfc36e29370e46768b3e9344f4e1ea524b

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