Malicious PDF — malware analysis report

Static analysis result for SHA-256 6db2ecb5ca2bf0c9…

MALICIOUS

PDF

69.9 KB Created: 2021-09-16 07:30:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: adf75b9c1df78cc5f3329f2924a2789c SHA-1: d9cc86769a9f1b1bffb65bd3c8d82b080208c7b5 SHA-256: 6db2ecb5ca2bf0c94117bdf7a03786be031fcde23aee71f4cbe721a773bdb4e3
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS platforms. The presence of numerous URLs, including those pointing to potentially malicious content, supports the classification as a phishing or malicious redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://gbfrjournal.org/pds/userfiles/files/16959939621.pdf In PDF document text
    • http://himalayakebab.com/shipinc/userfiles/files/15291436710.pdfIn PDF document text
    • http://rallyteamwalraven.nl/file/kivapofiwig.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614272dc8604a---dixekaponomiguzav.pdfIn PDF document text
    • https://kolkatanagariksammelan.org/ckfinder/userfiles/files/38634223563.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/161361418379af---bakujedut.pdfIn PDF document text
    • https://selispin.com/calisma2/files/uploads/satadetu.pdfIn PDF document text
    • https://philly.drinkpoint.com/uploads/files/gobomirugurelepifene.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/kh2c8apbjkp7khracgngmfmle6/sewimikazuvo.pdfIn PDF document text
    • http://www.hon-ro.hu/userfiles/files/72215275924.pdfIn PDF document text
    • http://volkshilfe-vlbg.at/images/content/files/2988296798.pdfIn PDF document text
    • https://idroilektriki.gr/files/file/tijinapazetafeburosedi.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/161370d8492487---naxezerutulikirized.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/16134c4db5f33a---xuvokexukodumawebivo.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613b20ed720b3---12985678437.pdfIn PDF document text
    • http://yer-krasnodar.ru/ckfinder/userfiles/files/zizebopatitasikojevofizi.pdfIn PDF document text
    • https://zhavezbozi.cz/data/file/mupamifunoz.pdfIn PDF document text
    • https://partroyfuneralhome.com/partroy/assets/file/towubopofutila.pdfIn PDF document text
    • http://alptw.com/images/files/kapevuribo.pdfIn PDF document text
    • https://washlounge.in/ckfinder/userfiles/files/4435645840.pdfIn PDF document text
    • http://sualpturizm.com/userfiles/file/dufeta.pdfIn PDF document text
    • http://islandpointfl.com/userimages/basudeziwolomupudomiko.pdfIn PDF document text
    • http://el-master.ru/userfiles/file/50023096396.pdfIn PDF document text
    • http://plymouth-logs.co.uk/ckfinder/userfiles/files/90691962505.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=cheat+code+numbers+for+gta+vPDF 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.

FilenameKindSourceSize
font_00_sfnt_off0000b2ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2AE 11120 bytes
SHA-256: 9c0708cffe96c24a27e24dca06797a149362ff7bd282dc891e5673fb4272e937
font_01_sfnt_off0000cc4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC4A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e45c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE45C 14856 bytes
SHA-256: 2879d5d7e77bccca35717b4a33eae7c60f7b79bb5f10ef601e8a558e5aee90f0

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