Malicious PDF — malware analysis report

Static analysis result for SHA-256 7aaac19ad0724f93…

MALICIOUS

PDF

91.1 KB Created: 2021-06-27 04:37:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: fcd0a0c8fbd3de332da6c71001b42b67 SHA-1: 84811ac5946496bafb7ce77a82e64de1d5a55b2b SHA-256: 7aaac19ad0724f9328737e655fe3ebd2037b930f2dd5a4f662445ad69a923e66
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 ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, directing users to multiple external URLs, some of which are hosted on compromised WordPress sites. The primary attack pattern involves luring users to potentially malicious content through a series of redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://remoteyourstaff.com/calisma2/files/uploads/dibafin.pdf In PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/d2f6a77f8f09fc8645fd9af1346fa259/74140720487.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/sqnihsb1uh7ouunpe9mb5p6siv/46999446243.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608bcb18781f6---13582052292.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/pekizur.pdfIn PDF document text
    • https://llsindia.in/FCKeditor/file/12253847572.pdfIn PDF document text
    • https://genesislighting.net/wp-content/plugins/super-forms/uploads/php/files/c0764370d3ea7f159ab80d64926b8221/59618224699.pdfIn PDF document text
    • http://asokmontridental.com/userfiles/file/goriximisedigenaliko.pdfIn PDF document text
    • http://pokemom2.com/uploads/files/dasopufelogid.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac8e29bae58---65514319313.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a61eb1899de---82092547355.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc6080884ba---71094538956.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/5410b100737135753556eceb6db65305/43690327513.pdfIn PDF document text
    • http://diamond6ranch.com/userfiles/file/robufobegopaxetiloresada.pdfIn PDF document text
    • https://agatanorek.com/files/file/digidivegizunewane.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/270427e1306a4fbf0cd3ac4d29972558/tunudemevediseratobipi.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/8e22cc2a3d1deafaf5a020650ab390b2/99000905635.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/e78e51a96e4eebbfe018647216e8bf66/risanegomevibabufuzux.pdfIn PDF document text
    • http://harchovyk.com/userfiles/file/3467254257.pdfIn PDF document text
    • https://africanresearchcenter.com/userfiles/file/16048988017.pdfIn PDF document text
    • http://fw-simple.com/uploads/files/52068163177.pdfIn PDF document text
    • http://medicare-darmstadt.de/bilder/UserImages/file/xuwakekazenovodavuture.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=unemployment+benefits+by+statePDF 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_off0000ffc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFC5 17428 bytes
SHA-256: f1934e8b67c95a7ea503e343e49ee3cee6e836816c78f0cbdc02ef0a1493f975
font_01_sfnt_off00012d78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D78 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001458f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1458F 10680 bytes
SHA-256: 420b8027161c8d245a817e8b13bd8dcbcc66c85c06f71e62e704a35c5cfb40ce

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