Malicious PDF — malware analysis report

Static analysis result for SHA-256 1628332981bc9f37…

MALICIOUS

PDF

77.4 KB Created: 2021-09-04 08:28:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: dd0c85fc0692157d672b8f532f78c32f SHA-1: 0fa73011d554ede9a48820c3412759f74ff06d88 SHA-256: 1628332981bc9f37f17b2a06cd9cf646d9622ea728aeb7fe073682686e0d5bae
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links indicates an attempt to lure users into clicking them, likely leading to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 http://campbellelectronics.com/uploads/67824470259.pdf In PDF document text
    • http://penzionriverside.cz/files/file/jekemune.pdfIn PDF document text
    • http://b-solutions.net/userfiles/file/jakikaxolabovufojej.pdfIn PDF document text
    • https://doluhosting.com/calisma2/files/uploads/5952191156.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088b1044410f---962450297.pdfIn PDF document text
    • https://club-sports.net/uploads/products/files/62485322042.pdfIn PDF document text
    • https://himalayanwanderer.com/himalayan/userfiles/files/18868542986.pdfIn PDF document text
    • http://cn-polylysine.com/d/files/wemisuvatezifesufop.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9d07f2fa45---ginigazuvowixoliga.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/a3082a4f7583108617081ac3ddc44406/xasefum.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/44ade2cb8a5b3fadd4e383766ec6b108/92844620087.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e3dc290479---jigulipixutesajolajod.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/8d161b00d915d90623b1f9b96986a3e7/sifazusow.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/c5b3f67c0b23db040a971d8f744f78cf/regaberutozanijilo.pdfIn PDF document text
    • http://noithatdangcap.vn/app/webroot/uploads/files/faxaj.pdfIn PDF document text
    • https://roweryelectra.eu/app/webroot/uploads/file/16203434825812.pdfIn PDF document text
    • http://altinay-law.com/images/file/19075200499.pdfIn PDF document text
    • https://cursosadistanciayonline.com/medios//files/kezujefo.pdfIn PDF document text
    • http://www.aqsclimited.com/EditorImages/file/56725453384.pdfIn PDF document text
    • http://mistral-paints.cz/userfiles/files/62006374174.pdfIn PDF document text
    • http://myxroad.net/upload/userfiles/file///87704731562.pdfIn PDF document text
    • http://box8websites.com/ckfinder/userfiles/files/mepusomalitag.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b47c29db444---mudivafotonewosirevar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=ramsey+campbell+cuentos+pdfPDF link annotation
    • http://s292376414.onlinehome.fr/datas/imgmail/file/xuzed.pdfIn PDF document text
    • 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_off0000c8ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8FF 17608 bytes
SHA-256: 68cea3196bf83c2a2c58ed44086f56b35775de5ac87eb71d00fb764014cad000
font_01_sfnt_off0000f695.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF695 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010eac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EAC 10988 bytes
SHA-256: 72ab6626e068f3956a9e1bad965b04872716077192c5fd413970804156725a51

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