PDF malware analysis — malicious · f35f333f6a2435ab

MALICIOUS

PDF

81.5 KB Created: 2021-09-01 03:52:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23

MD5: 07ce690b1f2dece80d510e12d8a586e3 SHA-1: acdf1654d801430f4fdbc2f3bce1a6b44d950d86 SHA-256: f35f333f6a2435abe46aa6e603388a752a981eb3badfc67afef67f29b52c8cd1

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains a large number of links, many of which point to compromised WordPress sites hosting further PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious content or exploit vulnerabilities. The primary attack pattern observed is the use of a link farm to distribute malicious payloads or redirect users to phishing sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9911

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://gfow.om/wp-content/plugins/super-forms/uploads/php/files/tvsep7j5l1kqdlrlrhebv3su69/43403826840.pdf In PDF document text
- https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/96mo5eirljgp67e1p9uvrifug7/xujizuxowipodinixirasa.pdfIn PDF document text
- https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160982956bdece---xipuv.pdfIn PDF document text
- http://studiolegalezullo.eu/userfiles/files/nenaxojifijif.pdfIn PDF document text
- http://guoyangmoju.com/userfiles/files/84460849493.pdfIn PDF document text
- https://readandenjoy.ae/userfiles/files/25596930824.pdfIn PDF document text
- http://olimpic.hu/ckfinder/userfiles/files/14206892286.pdfIn PDF document text
- http://fier-forjat-valimet.ro/ckfinder/userfiles/files/79387440518.pdfIn PDF document text
- https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/2cd5f4436665c461b0d402919c6420e6/luronibilefit.pdfIn PDF document text
- http://dobryremont.pl/ebobas/portal/app/webroot/img/tmp/file/16274546069044.pdfIn PDF document text
- https://ecobox.eng.br/wp-content/plugins/super-forms/uploads/php/files/inmim79pgi3nkg27i1oeoqh94s/gogikefedobonobirazadofu.pdfIn PDF document text
- http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/161276f399b208---botogejenamimetesedip.pdfIn PDF document text
- http://eprdel.cz/userfiles/file/jevitijufotareduxitevarol.pdfIn PDF document text
- http://scottsdalehighbeavers1978.com/clients/80197/File/mevex.pdfIn PDF document text
- http://jongauger.com/userfiles/file/rojofetelofotubalovonimuw.pdfIn PDF document text
- http://www.elstar.ru/uploads/files/22493485347.pdfIn PDF document text
- http://rentaruedas.com/files/others/zinupumumisalesonodew.pdfIn PDF document text
- https://too.kg/wp-content/plugins/super-forms/uploads/php/files/4f7d25920e9365e123eeb2787e7947c9/80753255535.pdfIn PDF document text
- https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/597c299c0ef116d4176cd1dd7d534ce4/84130516376.pdfIn PDF document text
- https://www.cylinder96.ru/admin/ckfinder/userfiles/files/fazupagesesebosew.pdfIn PDF document text
- https://farmacieitaliane.com/documenti/file/wokisebofi.pdfIn PDF document text
- https://asthasupermarket.com/userfiles/file/7924318736.pdfIn PDF document text
- http://daoltrading.com/userData/board/file/fagodorikanovadipekumi.pdfIn PDF document text
- https://tempatpasang.com/contents/files/lagaz.pdfIn PDF document text
- https://m-isc.com/userfiles/file/82695550318.pdfIn PDF document text
- https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8651d5cae---99685433891.pdfIn PDF document text
- http://archissimo.eu/userfiles/files/73621921755.pdfIn PDF document text
- https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/d7ham1hlt6i6o8brmivsi2av0u/zobaxozezevusemedaf.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=class+8+icse+ml+aggarwal+solutionsPDF 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.

Filename	Kind	Source	Size
`font_00_sfnt_off0000d779.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD779	18048 bytes
SHA-256: `6d5cf884a6737b29b0013c3772af948638bd7fa4fcf64090e13cb412bdfbb514`
`font_01_sfnt_off0001063e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1063E	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00011e55.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11E55	11000 bytes
SHA-256: `3aefb50536e6f62f36bc1788edc72b0a240bebe271bf1e8f0a05ee3f5982b811`

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