Malicious PDF — malware analysis report

Static analysis result for SHA-256 f17cc900a07f016c…

MALICIOUS

PDF

82.3 KB Created: 2021-09-06 21:28:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7cc6bc03bd68924bc509904debd5b8e1 SHA-1: 3c18c60d0f80a53a697f5faa4b3f057a909976a3 SHA-256: f17cc900a07f016c630225baf5b682b9c4aa066d6939f18c9a9b88a75987dd40
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a link farm pointing to multiple compromised or disposable hosting domains, suggesting an attempt to redirect users to malicious content. The presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://atlastoursntravels.com/userfiles/file/93591608393.pdf
    • http://bartuceviri.com/userfiles/file/94783037876.pdf
    • https://mfdesign.hu/files/file/vamifejirewawuno.pdf
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/1611b369b56cf9---benekuvagadolubew.pdf
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/666645f93094a116a37305d7d2145c3b/92248165190.pdf
    • http://maskaevlawyer.ru/userfiles/file/livivuboxolarolomasaxudim.pdf
    • http://taxiluzern.ch/khurasan/userfiles/files/73514503587.pdf
    • http://gesht.ru/admin/ckfinder/userfiles/files/zofukudilotima.pdf
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac2c49d565e---kaxukuvi.pdf
    • http://hillcountryawningsandsunscreens.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607272f5e7f81---redajudimen.pdf
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/fvlhf59tk81mpkfkgjth4um2l1/71575139350.pdf
    • http://ventilatoryzlin.cz/images/file/98403851341.pdf
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c205316a564---41724471479.pdf
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1611b6938a18b0---xaxax.pdf
    • http://garderoba.sk/images/_file/29483647412.pdf
    • http://szpk.hu/_user/file/84045788478.pdf
    • http://birzebbugastpetersfc.com/files/file/49664284494.pdf
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160808537133dd---217866026.pdf
    • http://meruzhankhachatryan.com/app/webroot/files/file/zudukepozorijaxinoki.pdf
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/dl3682tjk8drqale5ubfv751b6/fotuvategawag.pdf
    • http://pickup-ws.com/userfiles/files/xufuvupemebegudupaxojoz.pdf
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d9ae8a3103b---86451952478.pdf
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/i1l6pigsv0upatldpt68tjncj6/92761218268.pdf
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1610b687e94a91---18468233216.pdf
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160faf1e81c196---gotafofok.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=physically+based+rendering+3rd+pdf
    • 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_off0000dca9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDCA9 16792 bytes
font_01_sfnt_off0000f4c0.bin
e1e48c9bb71d640e3dc23ca6af5185e0e32cab4ba91c0dff340a2a98932168d9
pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C0 11108 bytes
font_02_sfnt_off00010e2f.bin
3594a9a1169c9484dc228d2b980f67d3950bb0358d143c574f1079ccc25a8405
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E2F 17252 bytes