Malicious PDF — malware analysis report

Static analysis result for SHA-256 43f40633ac37921b…

MALICIOUS

PDF

73.1 KB Created: 2021-09-19 07:51:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 34923ce0b471096f31607af3cfd45dde SHA-1: 678b056987de563bcd163d0940ac5ed3059427eb SHA-256: 43f40633ac37921bd19c48da0eec2f75c1f9375a04c78060346d418564d09900
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Several heuristics point to the document functioning as a link farm, with multiple URLs embedded that lead to potentially compromised WordPress upload directories. The presence of these links suggests an attempt to direct users to malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec07e6d193---satadesava.pdf In PDF document text
    • http://www.greenfield-sustainability.com/images/files/kanav.pdfIn PDF document text
    • http://hakanhurdacilik.com/userfiles/file/mudilapaj.pdfIn PDF document text
    • https://braintreeclinics.com/app/webroot/img/files/13358429601.pdfIn PDF document text
    • http://phuwangnam.com/user_file/file/72014462082.pdfIn PDF document text
    • https://ta-taiwan.com/app/webroot/userfiles/files/60776810614.pdfIn PDF document text
    • http://vititanon.com/user_img/files/lefedetovafexizo.pdfIn PDF document text
    • http://partner-support.net/user_data/userfiles/files/kelisefug.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/161469850572c1---jomokelov.pdfIn PDF document text
    • http://diagnosticaedilizia.com/userfiles/files/lipinafosazelewomi.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613d9d908909a---52879384434.pdfIn PDF document text
    • http://citysoupsbellevue.com/uploads/files/bejanixipozopiliveguvu.pdfIn PDF document text
    • https://privatecambodiatour.com/userfiles/file/59524886503.pdfIn PDF document text
    • https://croatia-flyfishing.com/files/22404871284.pdfIn PDF document text
    • http://phunggia.biz/userfiles/file/51035542615.pdfIn PDF document text
    • http://matrix-corporation.com/upfiles/editor/files/xepidetozofivukuwaf.pdfIn PDF document text
    • http://pretaporter-pegah.com/userfiles/file/61962505313.pdfIn PDF document text
    • https://1tlstar.com/storage/uploads/files/gubamojidewovedikuxiwujol.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134289d3508f---vaputel.pdfIn PDF document text
    • http://incomsistema.ru/ckfinder/userfiles/files/49997891762.pdfIn PDF document text
    • https://iohrp.org/f_files/files/3236778875.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16140ba2720f26---mirudoxaxirozaxe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=mini+militia+freePDF 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_off0000b705.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB705 18808 bytes
SHA-256: dad34e98dbf79412c222ba5f907958d6919fe13c3230306453e91fe467d631f8
font_01_sfnt_off0000e8a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8A4 10080 bytes
SHA-256: 3ab0fdab3763e1d12ae317713496e9dbd25fe0d88554b096e698dcaa6f90880d
font_02_sfnt_off0000fefd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEFD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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