Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a3a0c1d3bcae946…

MALICIOUS

PDF

85.5 KB Created: 2021-09-02 12:14:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d45c22238c6627d21046c82bf35e9230 SHA-1: 9853cfa42a5040425e12e5a2860494abb1642a27 SHA-256: 6a3a0c1d3bcae946c014d0e0b0b970d8f1684e78a068b1cd230e16ade91a7b0c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure suggests a link farm designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://philabc.ru/uplcv?utm_term=karl+mayer+sizing+machine+manual PDF link annotation
    • https://congchung7.com/upload/file/28011585287.pdfIn PDF document text
    • http://hfengly.dk/skoleportalen/userfiles/file/lafivelejaruruwob.pdfIn PDF document text
    • https://www.totspotdaynursery.co.uk/ckfinder/userfiles/files/66528070269.pdfIn PDF document text
    • http://jumpstart.mobi/ckfinder/userfiles/files/57095556026.pdfIn PDF document text
    • http://goksirkrupskimlyn.pl/img/upload/files/62073395871.pdfIn PDF document text
    • http://studiomuraca.eu/userfiles/files/38538418996.pdfIn PDF document text
    • http://bbfederico2.net/userfiles/file/guvetofoxabumufuk.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16088273ad5c2e---90950979994.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d248918375---titogofokopuzadodarirav.pdfIn PDF document text
    • http://xn----7sbabjkhbzbqti4a3apfmdd2s4b.xn--p1ai/ckfinder/userfiles/files/83277089469.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/160760eeb67fe6---zurizojituvapolegito.pdfIn PDF document text
    • http://mea-travel.pl/userfiles/file/21726078232.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/cdd71d12decce41e70550593cb698a49/vodeviso.pdfIn PDF document text
    • http://huile-de-nigelle.info/userfiles/file/riniwaken.pdfIn PDF document text
    • https://travelworld.ro/userfiles/file/43467775213.pdfIn PDF document text
    • https://www.weldcor.ca/public/ckfinder/userfiles/files/nibuvamifinudelitubib.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160928e03c7fef---jubiwajusugoribakiz.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/jupuxuzogerodaxovupuke.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/gavuviwewazaz.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cac36a759c---56006683039.pdfIn PDF document text
    • http://jhferry.com/data/fckeditor/file///76689089996.pdfIn PDF document text
    • https://golf-tout-terrain.com/publish/page/file/bomavanuxofurubudelefeped.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_off0000e317.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE317 20224 bytes
SHA-256: 3aa1c53e27f4d29acbeedf6e43db9baf28a64260a7ac1e122a8d94dd125e0954
font_01_sfnt_off0001187b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1187B 10724 bytes
SHA-256: 3c026a1501323b7f78de0b6163ccee91727a6d5ee2bfc6e9da5291020b9831cb
font_02_sfnt_off000130f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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