Malicious PDF — malware analysis report

Static analysis result for SHA-256 973d2bd861400986…

MALICIOUS

PDF

80.6 KB Created: 2021-09-01 22:18:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e4a52c3040c3b2699d3126921b97f353 SHA-1: 7df2fe7aa822556715fe26c622c4a8f4fb7dcddb SHA-256: 973d2bd8614009863ed78e4a650636ee93512f5d22ce563dae15fd5463545c08
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress uploads or disposable hosting domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://polipadel.com/userfiles/file/xurugimapew.pdf In PDF document text
    • https://ceccargiurgiu.ro/userfiles/file/fodeju.pdfIn PDF document text
    • http://universalthailand.com/images/uploads/ckfinder/files/67684420663.pdfIn PDF document text
    • http://100gastro.cz/soubory/files/30157875853.pdfIn PDF document text
    • https://summit-christian-academy.com/scauserfiles/files/75710658056.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/3uhe8u0ceufhsijkmm09dt4na3/gazobojawotupamivu.pdfIn PDF document text
    • http://dioceseofniranam.org/userfiles/file/35491329855.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9b8e2a16df---bunitopufesepugixel.pdfIn PDF document text
    • https://smartcirclegroup.com/userfiles/file/74777303499.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/f02f194bf9f98134b51f72fc78cf2ac3/didid.pdfIn PDF document text
    • http://www.retorika-zidar.si/ckfinder/ckeditor_uploaded_files/files/xutovegixa.pdfIn PDF document text
    • http://doktor-okonski.pl/uploadimg/file/zepuwu.pdfIn PDF document text
    • https://livredart.com/ckfinder/userfiles/files/junar.pdfIn PDF document text
    • http://flightshop.jp/images/blog//file/34833990197.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d71e69c4dc8---pazaxosufuwinebetififone.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160899714aafcf---kiminosoruruvegajotoribal.pdfIn PDF document text
    • http://airfa.it/userfiles/file/wumapivixivolipus.pdfIn PDF document text
    • http://banglenhospital.com/UserFiles/File/94480237621.pdfIn PDF document text
    • http://phayaotechno.com/UserFiles/File/25969880660.pdfIn PDF document text
    • http://www.cenlajobinator.com/siteuploads/editorimg/file/75871105264.pdfIn PDF document text
    • http://choinka4x4.org/cms/files/file/giwut.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=places+in+belizePDF 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_off0000d9c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9C6 10108 bytes
SHA-256: 5b7e523679efdaba65a1edf71a116fcdfa870991f8bb5732695f1711a2b5ca78
font_01_sfnt_off0000f068.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF068 17136 bytes
SHA-256: 9731d320a826b59b3e0fa136f16567ad67e483f9297d555dcf3f203ab4605311
font_02_sfnt_off00011ca7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CA7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1