Malicious PDF — malware analysis report

Static analysis result for SHA-256 070bce8e9cc7f75a…

MALICIOUS

PDF

71.5 KB Created: 2021-09-24 14:17:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9557cbbf5c9f367a559d65e0e4c3dd37 SHA-1: 175a8b5560d4fa6653abc1ac59183011528a38d3 SHA-256: 070bce8e9cc7f75a1cc5d469e099460b479cdc33bda8d4ece150325d20a28689
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as a malicious PDF by multiple heuristics and a machine learning classifier. It contains numerous external links, many pointing to compromised WordPress upload directories or disposable hosting, suggesting a link farm or redirection mechanism. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates an attempt to direct users to potentially harmful content, likely for phishing or malware distribution.

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 https://laborke.ru/uplcv?utm_term=coc+hack+version+unlimited+gems+download PDF link annotation
    • http://www.cavice.fi/tiedostot/files/lonusol.pdfIn PDF document text
    • http://ristoranteibucanieri.it/userfiles/files/kodigimisajorudosad.pdfIn PDF document text
    • https://www.hkfew.org.hk/ckfinder/userfiles/files/pavuzosediwix.pdfIn PDF document text
    • https://somogyplusz.hu/files/43461279457.pdfIn PDF document text
    • http://zhongyuemedia.com/filespath/files/20210924033119.pdfIn PDF document text
    • http://findingthegrey.com/userfiles/file/wuzejifalexag.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b2bbd48b28---81086338733.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143b632c1b1a---71644398714.pdfIn PDF document text
    • http://eg-connect.com/uploads/editorfiles/file///31832601072.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e14cd1f98f---wuvalipaxotixuvumu.pdfIn PDF document text
    • http://bugskin.org/userfiles/file/lisamefaxuxopadi.pdfIn PDF document text
    • http://casinodanmarkjackpot.dk/userfiles/file/74866310544.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/48769411435.pdfIn PDF document text
    • http://hqshop24.com/userfiles/file/minexavupijawal.pdfIn PDF document text
    • http://cellesekorea.com/ckupload/files/luxagozefuwuworexezowi.pdfIn PDF document text
    • http://turhantur.com/turhantur/files/51619977755.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16132558be38bb---nagunux.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/bpq9c29p0t0olgn9n3iojlipko/jugakevusofelikelawabori.pdfIn PDF document text
    • http://acrclubinversores.com/files/galeria/files/wosokilujokipaf.pdfIn PDF document text
    • https://granitabrasive.hu/editor_up/37529921730.pdfIn PDF document text
    • http://xn--9p4b29dncp2cc6y.net/upload/fckeditor/file/22062665573.pdfIn PDF document text
    • https://guruamardaspublicschool.com/userfiles/files/86540688602.pdfIn PDF document text
    • http://www.pics4us.de/userfiles/file/49355020152.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_off0000b4dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4DC 11192 bytes
SHA-256: 346b683e4182328c2d27604809f0c4b5d6c67e08db9b42570db9182e6fd718de
font_01_sfnt_off0000cec4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEC4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e6d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6D6 16284 bytes
SHA-256: 1f273311fc8839cc2268369c33f1ac9a696cb4433f8fbfe7ad7dcc629c7c7d17

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