Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f8636ab5d1d665b…

MALICIOUS

PDF

103.9 KB Created: 2021-06-28 01:15:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9806e85b214bff4ac008efb692bb144a SHA-1: 3d18ace03337e5497ab4d6b435571cb1f4705d00 SHA-256: 5f8636ab5d1d665b3bd21bd68dcaa8dce9dec757fb8491194ed230d731a93bee
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to websites, some of which are hosted on compromised WordPress installations. The primary purpose appears to be directing users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9874

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://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/60750b6a3f63a70cba24337f8f703551/27633953162.pdf
    • http://rustproofingottawa.com/userfiles/file/7971359643.pdf
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1607444d18ef33---10419015461.pdf
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aec67dbe5ba---1148712505.pdf
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/121b785c49203d5fd33d0735168b6a1e/95497986331.pdf
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/f0cd5285eb2b3e464b6d07e5a78a20d7/63307521184.pdf
    • http://bawaconstructions.com/editorData/file/natejujemesodo.pdf
    • http://growlink.biz/userfiles/file/80314613821.pdf
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099f7cfd3c80---91256574434.pdf
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/0759198303bf3f216751a0d512d242c8/30291717073.pdf
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dbc47c65a6---nazajifo.pdf
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a78a7d3c89b---10368848090.pdf
    • http://pathtojanna.com/userfiles/files/surifo.pdf
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/83114850941.pdf
    • https://cambodiaangkorhomestay.com/userfiles/file/doxivunobiwifobeziwavegi.pdf
    • http://historia-bfured.hu/userfiles/file/77731223372.pdf
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/09nkc5286rq6r48ip23noe70qa/52246185350.pdf
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/7e1f6f4bd17c8f237345324902fa1e01/64759761289.pdf
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608871992c7ee---80086794253.pdf
    • https://mmagame.com/userfiles/file/repagipivi.pdf
    • http://www.ecostroyservis.ru/File/sopebar.pdf
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/cml521i4ghl94gjqk077gp1tb8/56710326380.pdf
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a510f07172---borerananidape.pdf
    • http://futurepoolandspa.com/ckfinder/userfiles/files/85098801806.pdf
    • https://abofahed.com/userfiles/file/15188711693.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=qa+technical+interview+questions+and+answers
    • 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_off00011d34.bin
2ed29c8a2095361377a7efd7c91566f66a883910e8c2d6043e6a9693e240585a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11D34 10924 bytes
font_01_sfnt_off00013664.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13664 16792 bytes
font_02_sfnt_off00014e76.bin
7752deb54e3efc0d25231f6d29dfe41269e4b5f8022922fa3ae9294a5d2d92dd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14E76 17452 bytes
font_03_sfnt_off00017c08.bin
74ea40c6abafff908ba0a862ebf25ee1d47d31f530ca964bdc695191fb21b084		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17C08 16116 bytes

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