Malicious PDF — malware analysis report

Static analysis result for SHA-256 86d0c77bba24965f…

MALICIOUS

PDF

108.9 KB Created: 2021-08-18 03:19:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fcb9dc57686bb8c631df0b627af2956f SHA-1: 4df6835ae3e522a6e087fa3f9eed72392e1892bf SHA-256: 86d0c77bba24965f8a3c6c14ee81c5fc0bd02569131b7d25bee8f9c80b4047f6
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, flagging it as a phishing trojan. It contains a link farm with numerous URLs, many hosted on compromised CMS platforms or disposable domains, suggesting an attempt to distribute malicious content or manipulate search engine results. The presence of external URI heuristics and link farm detection rules further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://klasykarozrywki.pl/public/images/fck/file/fekazigexixumikipitifaze.pdf
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160822ee18ad21---variwitoxumapaxewix.pdf
    • http://namngonviet.vn/user-/files/xamevopobutadajux.pdf
    • http://novosib-sport.ru/ckfinder/userfiles/files/90150561904.pdf
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/c773f126b57df7c9d859ba736382bb43/8095952405.pdf
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c78153422ce---9897207364.pdf
    • http://capesociety.ca/uploads/files/sodebajamus.pdf
    • http://winfielddeli.com/ckfinder/userfiles/files/53367436341.pdf
    • https://ristovski.mk/public_html/upload/userfiles/file/xosatenavijab.pdf
    • http://yepuco.com/uploads/files/34516769078.pdf
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/6af329804f21d3db24f10b49d791b449/bevapal.pdf
    • https://mosaicopeoplecorporation.com/ckfinder/userfiles/files/kubuf.pdf
    • http://agisma.ru/files/pages/files/23497156937.pdf
    • http://haozuowenwang.com/imagefiles/file/faxibanixinak.pdf
    • http://mmbc.cz/_data/user_files/file/93917377555.pdf
    • https://hophamthaibinh.com/upload/files/tatefebifeno.pdf
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607b966b70729---36651179597.pdf
    • https://planet-pvc.com/upload/files/vijudofolaxesusawabuw.pdf
    • https://castel.ro/userfiles/file/497212258.pdf
    • https://pet-fashion.ro/mm/file/15455901898.pdf
    • https://advantagelic.com/singhania/downloads/file/mekidukoj.pdf
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/e69dc34d0bb00ace4f9953a1159690cf/4987611649.pdf
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/1607d108972c86---gaxoxonezujak.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=medical+surgical+nursing+book+by+javed+ansari+pdf+free+download
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011bf9.bin
b60fa3f3a25d0e8710dc7047e9b119c920236b630a00dd70f9c0747770330e5f
pdf-font-stream PDF embedded font (sfnt) at offset 0x11BF9 21628 bytes
font_01_sfnt_off00014106.bin
9bfe7c4e2e098fe3c91d92286b708ced80520a42c11cb0c8ef258115cf847c93
pdf-font-stream PDF embedded font (sfnt) at offset 0x14106 18496 bytes
font_02_sfnt_off00017127.bin
f2e083b82a4bc4b62c4ef8ebd197c70267020d65144935be3edd0e68e7deab32
pdf-font-stream PDF embedded font (sfnt) at offset 0x17127 11416 bytes
font_03_sfnt_off00018bca.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x18BCA 16792 bytes