Malicious PDF — malware analysis report

Static analysis result for SHA-256 1af6021e9bd5d867…

MALICIOUS

PDF

71.8 KB Created: 2021-08-03 00:01:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1422f612938e73f6c8bb58a8274609df SHA-1: f9db0e012ac07e7a6860bf150c4a4022165bffe9 SHA-256: 1af6021e9bd5d86788bc1dde6e5e4df10b7d519c4c6655c21bc140eceb5d7796
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains numerous links pointing to potentially compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://fsgpj.com/upfolder/e/files/20210626191905.pdf In PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609874c4e935b---filod.pdfIn PDF document text
    • http://opakowania-loga.pl/zdjecia/fotki/file/98475573407.pdfIn PDF document text
    • http://sns-russia.ru/userfiles/file/46160711984.pdfIn PDF document text
    • http://hodgesmageefamilyreunion.com/clients/c/c9/c95619ca3ec29dd030dc8935b97378d4/File/68839228962.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a96313e27e7---riloruxixekerofanarojufef.pdfIn PDF document text
    • http://3q1p.com/upload/file/2107200742050943778cuu0zcepxmz.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ce3d52ec4db---62552028024.pdfIn PDF document text
    • https://www.stnedu.com/ckfinder/upload/files/68678016980.pdfIn PDF document text
    • http://nexxosrealty.com/userfiles/files/59163904907.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/160750842ab041---lobezemudezil.pdfIn PDF document text
    • http://miraesusan.com/ckupload/files/numapidiju.pdfIn PDF document text
    • https://successalpha.team/upload/files/setisuvexorozu.pdfIn PDF document text
    • http://www.szphotar.com/admin/img/files/lavitemofibuxesuvonu.pdfIn PDF document text
    • http://bong-dem-long.org/upload/editor/files/nuzajep.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c51c5825f8d---muzabekigenitinixod.pdfIn PDF document text
    • http://ptairsupply.com/userfiles/file/4749382860.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c0657dda771---ledomexogukaruweti.pdfIn PDF document text
    • http://winkeleninzundert.nl/uploadimages/files/76795536928.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b744fac230b---6208802581.pdfIn PDF document text
    • https://wemservice.com/ckfinder/userfiles/files/wusumizi.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/55440185396.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bf8fec610be---69363584328.pdfIn PDF document text
    • https://navliecky.net/userfiles/file/46257905252.pdfIn PDF document text
    • http://avanti-kuhni.ru/upload/files/webiwenexegiborazovek.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=coreldraw+tutorial+pdf+in+hindiPDF 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_off0000b7be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7BE 16120 bytes
SHA-256: 05f2039a6f547380953a8d3a6e2d66255f82fd0201ccce090c16899fbae45fff
font_01_sfnt_off0000e1bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1BF 10644 bytes
SHA-256: 207c8736dba3e01b66ebde8f75ad2efd7ebe35eb6437ad2158ff595fc9bc249b
font_02_sfnt_off0000fa11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA11 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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