Malicious PDF — malware analysis report

Static analysis result for SHA-256 a43a42085e46f358…

MALICIOUS

PDF

72.1 KB Created: 2021-09-25 19:16:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: bdfde30132be883e59d28fc7a761ec70 SHA-1: 226fa12aacb52c1297906805a37293d9ae892dab SHA-256: a43a42085e46f3585e3d8082843ee9f064354a66a1342b868d7ad3e84d8473dc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. Heuristics indicate it functions as a link farm, directing users to multiple compromised or disposable hosting sites, one of which is `pixomot.ru`. These links likely lead to phishing pages or further malware downloads, consistent with a trojanized PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://pixomot.ru/uplcv?utm_term=8+ball+pool+beta+version+5.0+0+apk+download PDF link annotation
    • http://drumlockingclamp.com/FCK_Editor_Images/files/dodoxajif.pdfIn PDF document text
    • https://www.cosanuesa.com/componentes/editor/ckfinder/userfiles/files/61386847320.pdfIn PDF document text
    • http://uleshuzatshop.hu/files/file/30124259222.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613de17c8b413---xisunobesifojawipok.pdfIn PDF document text
    • http://veganogle.es/uploads/ckfinder/files/xaruxagetofawexilad.pdfIn PDF document text
    • http://congress.bpv.su/content/files/files/pepoma.pdfIn PDF document text
    • http://cathugo-catamarans.de/res/wysiwyg/file/sozesemuluzo.pdfIn PDF document text
    • http://studiofantino.it/userfiles/files/29248717827.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16137d272aea0d---83398200353.pdfIn PDF document text
    • https://bvphcn.bdata.vn/upload/files/lefinoxidizakowasit.pdfIn PDF document text
    • https://frigosztufi.ro/ckfinder/userfiles/files/guwavebu.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16137a04d7ff7a---fisuxudovibenovinewutelik.pdfIn PDF document text
    • http://xinyaoqiye.com/upload_fck/file/2021-9-15/20210915220745796664.pdfIn PDF document text
    • http://fasson.vip/images/editor/files/89577424535.pdfIn PDF document text
    • http://carrozzeriardue.it/userfiles/files/63152793401.pdfIn PDF document text
    • http://uptownfallschurch.com/uploads/files/tovoxutekokadelovoseg.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b6d8c8a7b0---suxonosigoruvizezowo.pdfIn PDF document text
    • http://vvk-wiedermann.at/userfiles/file/zanafizuso.pdfIn PDF document text
    • http://home-hj.com/up_photo/file/vifiwagetuxepumunagopemas.pdfIn PDF document text
    • http://trieuduong.com/images/Download/29978041604.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614a3e27651bb---75998065456.pdfIn PDF document text
    • https://northcoteplaza.com/userfiles/file/58129826418.pdfIn PDF document text
    • http://hightopeducation.com/cms_uploaded/file/39911133396.pdfIn PDF document text
    • http://mijinmotor.com/fckeditor/userfiles/file/jiparasiduxofixesir.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/lazimubigakov.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_off0000b294.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB294 11200 bytes
SHA-256: 86991183ea5b6b2909a38ccc6a73b8c2438c14f0ceed71e376dbed7be30a33af
font_01_sfnt_off0000ccb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCB7 17140 bytes
SHA-256: 103a7d93380192410641d84957f99056123759f4d9cf45113f92c2aa6a36881a
font_02_sfnt_off0000f8bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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