PDF malware analysis — malicious · d670ee1617bad92e

MALICIOUS

PDF

78.3 KB Created: 2021-09-20 19:43:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26

MD5: f402d761edbebdb1731a137a26e7ef34 SHA-1: 54b61605b40d86b7bea521dd728e17a94bd8ee54 SHA-256: d670ee1617bad92e3460dea62a199dfb6f13b17f11a476edb8c490def40b2174

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous external URLs, many of which point to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports this. The file likely serves as a lure to redirect users to phishing sites or download further malware.

Machine Learning

Nyx PDF Classifier malicious score 0.9975

Heuristics 6

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
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=chacha+chaudhary+books+pdf PDF link annotation
- http://directopinion.biz/uploads/FCK_files/file/momovemijewijufeso.pdfIn PDF document text
- http://geo-equipe.it/userfiles/files/guxenoluzatasaketol.pdfIn PDF document text
- https://acrgruppe.de/userfiles/file/77529410761.pdfIn PDF document text
- https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614668e7ba724---zerojeserevori.pdfIn PDF document text
- https://www.abrasco.org.br/ckfinder/userfiles/files/59289123242.pdfIn PDF document text
- http://szjwwj.com/userfiles/file///ninekuzarugonudunolog.pdfIn PDF document text
- http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613f2f3887743---6292148048.pdfIn PDF document text
- http://somersetcountybar.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/popilepabekutovefizisusus.pdfIn PDF document text
- https://ibeguiristain.com/userfiles/files/janipemopiworep.pdfIn PDF document text
- http://ucg-eg.com/userfiles/file/tofofubasi.pdfIn PDF document text
- http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff46f4d9fc---kalawabewilenajorerekob.pdfIn PDF document text
- https://okinawa4d.com/contents/files/duxagemoberenubudalif.pdfIn PDF document text
- https://kaemsp.org/upload/editor/file/diwezotepexozibisuriw.pdfIn PDF document text
- https://merlak.ru/userfiles/file/nimofugewopibosidutunep.pdfIn PDF document text
- http://methese.com/upload/files/5713370450.pdfIn PDF document text
- https://promaxsuspension.com/csmimage/file/dapev.pdfIn PDF document text
- http://massvt.sk/editor_uploads/system/files/81233790495.pdfIn PDF document text
- http://z-sinpro.com/upload/files/subimepezejeloramurid.pdfIn PDF document text
- https://hbfilm.ca/resimler/files/rekepovezulagowaketi.pdfIn PDF document text
- https://psychologgia.pl/Upload/file/8067561881.pdfIn PDF document text
- https://bilalyapidekorasyon.com/userfiles/file/dofukasuvilusogovini.pdfIn PDF document text
- http://klgd.spokoino.ru/i/upload/files/sabigezonekoluwagixovokax.pdfIn PDF document text
- http://portaldeaquidauana.com.br/ckfinder/userfiles/files/zoposipozumoposovej.pdfIn PDF document text
- https://searchkar.com/ci/userfiles/files/foloxovevu.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.

Filename	Kind	Source	Size
`font_00_sfnt_off0000c8c0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC8C0	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000e0d7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE0D7	10724 bytes
SHA-256: `2ff1ca8b7ca390d5ea22a81eec323057e367794a5569433d6e15a29e1b638dc4`
`font_02_sfnt_off0000f968.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF968	19016 bytes
SHA-256: `9411f9667fd259e281ef817199199141b04272cbae0fd5684a474d44dd54be11`

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