Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c869a1cd8d9cf8d…

MALICIOUS

PDF

80.6 KB Created: 2021-09-17 21:53:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 712a971884cbf5079262e566cd088526 SHA-1: 069c72c38e8f3c51a63865ab7e96ce4aafc127b0 SHA-256: 1c869a1cd8d9cf8d4850ea6a6e37f99c580bbd82126ef4a877ad7a28447c1381
176 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ML classifiers and ClamAV. It contains numerous embedded URLs pointing to compromised WordPress sites and an IP address, suggesting it's part of a link farm designed to redirect users. The presence of these links indicates an attempt to lead victims to malicious content, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143787947bda---mogokamixakopijovok.pdf In PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143165ebdca2---19961525805.pdfIn PDF document text
    • https://databaze-zdarma.cz/userfiles/files/68807872700.pdfIn PDF document text
    • http://www.mariabeckmann.com/fotos/uploads/files/pegudukuwivizutus.pdfIn PDF document text
    • http://bugaboo-buffalo.eu/UserFiles/File/wowem.pdfIn PDF document text
    • http://hzxgdz.com/images/upload/File/6619430230.pdfIn PDF document text
    • http://studiocastigli.eu/userfiles/files/70268779869.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/1613fa43335e56---87731633311.pdfPDF link annotation
    • http://antwerp-reefer-tournament.be/argt/files/ponojorakeb.pdfIn PDF document text
    • http://ranchobg.com/img/file/67285483382.pdfIn PDF document text
    • https://sogelec-eng.com/files/ckfinder/files/78764890131.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613465adc4fd0---53229360957.pdfIn PDF document text
    • http://dexgerm.com/data/file/userfiles/files/82590393747.pdfIn PDF document text
    • http://ingore.cn/upload/files/tesegu.pdfIn PDF document text
    • http://zl369.net/userfiles/file/10352288970.pdfIn PDF document text
    • https://diphong.com/uploads/zikatimegudefunid.pdfIn PDF document text
    • http://p-energo.ru/content/file/jowaxoterufun.pdfIn PDF document text
    • http://aligokdemir.com/resimler/files/xetalakinuk.pdfIn PDF document text
    • https://tedesco.pl/userfiles/file/65053078077.pdfIn PDF document text
    • http://www.beautyvogue.ch/Files/file/53848202365.pdfIn PDF document text
    • https://www.koreayokogawa.com/ckfinder/userfiles/files/semubuvusiwiwunik.pdfIn PDF document text
    • https://www.whoamiandwhyamihere.com/ckfinder/userfiles/files/fuwasajoletojadozifuzunu.pdfIn PDF document text
    • http://giaydantuongphongngudep.com/images/news/file/mixevosegu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=unable+to+obtain+application+idPDF 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_off0000d041.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD041 20036 bytes
SHA-256: 5962bcd468acb197da1f93d1384374c86f0d58df8fabe9b13277e2ea1e7ff038
font_01_sfnt_off00010584.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10584 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D9B 10388 bytes
SHA-256: a53be74c04cc329df178d3561a38f3b1b24d4bf5e2fc98846bbd0dd0aac6eddf

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