Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e75ffe871116c57…

MALICIOUS

PDF

88.6 KB Created: 2021-06-26 03:45:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c12c46d6a9cc63220c776ac971008d44 SHA-1: a4b9389f4090753c0b4b2bc0aaaf6188231ea7b9 SHA-256: 8e75ffe871116c57b9ad3395624f7b6c8fd36830221a20cbf15282be8fe2d87e
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads, suggesting it's designed to host or distribute malicious content. The presence of numerous unknown URLs further supports this, as they likely serve as redirects or download locations for secondary payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a5fd5d4bc10---bonodikivox.pdf
    • http://amexeuro.com/an3_Uploads/file/52769242113.pdf
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca93bd55b7---8967068384.pdf
    • https://betenagro.com/sites/default/files/file/feladavag.pdf
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/5a26f48bd1f89ff354d9385c0c4e99af/gixodetitu.pdf
    • http://sarlampa.ru/upload_picture/45858426796.pdf
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/bda95efc59f27971c9f764f5c06c2235/47290260454.pdf
    • https://recapress.com/ckfinder/userfiles/files/93418388464.pdf
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/t74cnocmkmchlsj8917gku0ouc/52795452340.pdf
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/6e9a3b96f918d9e5a02ee16aaecc3180/nibav.pdf
    • http://gallery4walls.com/upload/editer/file/wazosopajuj.pdf
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/e7fbdf60642de7b0aabae685a0b2b97f/pekekononobipejedude.pdf
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a43ac3bc4b1---xegoz.pdf
    • http://614move.com/clients/4890/File/7382290154.pdf
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/dd9d573fa4dc4f4f3bbc31dd6a7db899/64546588159.pdf
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/5439174f58faeeaf95e6bb6cd51c9895/55954470935.pdf
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/e71cdc1c3bb673ba083a166377057102/nuxazujutuxexozopa.pdf
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094b903f411b---95791217822.pdf
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160791fd3209ff---53892668379.pdf
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/5r7uufocdv6ekbjl1iurfenhg4/xogelobaxub.pdf
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/d81aacd45c50be1abed9dd08b82288a4/xabereberevekosafona.pdf
    • http://ebbers-schilderwerken.nl/uploads/files/vekige.pdf
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a04e72eb56c---savepidarov.pdf
    • http://gerd-pollak.de/userfiles/file/21218262723.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=well+it%27s+true+that+we+love+one+another+lyrics
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f5ed.bin
91a8639e4cb3cdd524958de91213cb4cf84acecc1f79bec01db89412b1577777
pdf-font-stream PDF embedded font (sfnt) at offset 0xF5ED 17600 bytes
font_01_sfnt_off000123ee.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x123EE 16792 bytes
font_02_sfnt_off00013c05.bin
2ef6c072a3ec834d2b6286afbd7606d85673967dd72ec9f340dd6681648c64f3
pdf-font-stream PDF embedded font (sfnt) at offset 0x13C05 10720 bytes