Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcc8f61bf9be718d…

MALICIOUS

PDF

84.1 KB Created: 2021-09-06 02:06:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f2e400de7f6bf964c41a3973237a5114 SHA-1: adf20d9bcdb45c9e8d164214bf73dfdb01bd9bd2 SHA-256: dcc8f61bf9be718dc10598b5f0cbf387700081f4d6e1080405184e2748a13bad
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of multiple external URIs and link farm heuristics supports the classification as a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://chcial.ru/uplcv?utm_term=manual+impulse+sealer+price+in+pakistan PDF link annotation
    • http://malbreil.com/userfiles/file/69263010035.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16121c4d62b0d5---jofatubidenosejelobud.pdfIn PDF document text
    • http://stadtbild-intervention.de/Quansis/ckfinder/userfiles/files/kudirodokenek.pdfIn PDF document text
    • http://gt-outillages.fr/ressource/site-image/files/damapenajurojufudaz.pdfIn PDF document text
    • https://gbagencement.fr/uploads/file/raxijodorewumesofud.pdfIn PDF document text
    • https://12shio2.com/contents/files/lomasiboloporatixa.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607db7e1d24a4---wirupetafosifivitesoposu.pdfIn PDF document text
    • http://alptw.com/images/files/begosozogagumezepuwakeko.pdfIn PDF document text
    • http://sensi-leszno.pl/userfiles/file/vodifodivovo.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/tmp/kezaxozet.pdfIn PDF document text
    • https://pointswestliving.com/ckfinder/userfiles/files/lozadakuduguka.pdfIn PDF document text
    • http://kolkandkolkdesign.com/site/data/ws/files/jagudurofulobapumox.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/38030318459.pdfIn PDF document text
    • http://edu-family72.ru/content/images/uploads/file/70308354336.pdfIn PDF document text
    • http://nifaelectronics.com/userfiles/file/muvewovefuzofugif.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8729c20e4---sulanovewokevegodol.pdfIn PDF document text
    • https://truckforceone.com/upload/editor/file/25631651772.pdfIn PDF document text
    • https://confidence-ist.com/ckfinder/userfiles/files/41157775941.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/vq9jn4p31gtho1aunj364b9cf8/68909083193.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608448489a1ef---lanomapadanufododupozifuw.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/7f1liegc7hmilgsh97l9dcha2o/8022613513.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/ehoubbrk90asq8nc9ci8h4hrv7/gagikevenewo.pdfIn PDF document text
    • http://thomasbelldescendants.com/clients/40432/File/55746746455.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_off0000e271.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE271 10600 bytes
SHA-256: 1b15fc3acbee0fa7e05a1fc22e0375f08129cdc84410124e2c73079c9520dfbf
font_01_sfnt_off0000fa9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA9F 18480 bytes
SHA-256: c1931a6e52f3d0f3ad515c061a3fc25715ad5c0b099409b9febba92b53e35a1d
font_02_sfnt_off00012a6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A6F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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