Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f7f60ef0647d448…

MALICIOUS

PDF

77.3 KB Created: 2021-08-19 17:11:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 58a0c2a299c4298de46d3ac7e59a6809 SHA-1: d158794e0734e5ec2683b64b0fcc2b0aa25c444f SHA-256: 3f7f60ef0647d4489a4359d3f21ad51cc14b095c1efc51411cc332bdf506e0ea
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It functions as a link farm, directing users to numerous external URLs, many hosted on compromised or disposable domains, which is a common tactic for phishing or malware distribution. The presence of external URIs and link farm indicators strongly suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://alemotta.com/resources/original/file/97298224482.pdf In PDF document text
    • https://ijfbacknumber.com/editor_up/wosepejonibipogiwabovor.pdfIn PDF document text
    • https://piuspvc.it/userfiles/file/81257719297.pdfIn PDF document text
    • https://myupfield.link/wp-content/plugins/super-forms/uploads/php/files/9plngn11uplf8o9aqf28og3205/63944702312.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/16106a7aa906f8---kuxakotuvoxatinikepag.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e2d97315ce1---76152591312.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a741df6f59c---57606134750.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160df56ded3905---72730115379.pdfIn PDF document text
    • http://www.psychophonie-tarbes.com/ckfinder/userfiles/files/89761612112.pdfIn PDF document text
    • http://rotang.net/userfiles/file/73943154189.pdfIn PDF document text
    • https://ourcampuswindow.com/ckfinder/userfiles/files/kegogezuzef.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/pumijininazubopit.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c98db5e38fd---68695052028.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/47392334251.pdfIn PDF document text
    • https://serviceservice.eu/userfiles/file/23947539743.pdfIn PDF document text
    • http://hanauhrova.cz/files/jukonowejatemidiveg.pdfIn PDF document text
    • https://pima-alarms.net/slicice/file/dewenatasawekabivibuxi.pdfIn PDF document text
    • http://renovfab-menuiserie.com/userfiles/file/xuzetiveridixutokinejije.pdfIn PDF document text
    • http://vejwun.cz/images/liturepojupilekosesudane.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/jt6gstkcf1naejp06q9kitkf5q/ropemaworosow.pdfIn PDF document text
    • https://www.ebenisterie-burette.com/ckfinder/userfiles/files/18821184618.pdfIn PDF document text
    • https://canionglobal.com/FCKeditor/file/jemuwidegaxakid.pdfIn PDF document text
    • http://sweatrinserepeat.com/ckfinder/userfiles/files/36978868994.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/6c250764f2954805372b7120428a91b6/39699710707.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=%C3%B3xido+de+aluminio+nombre+sistematicoPDF 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_off0000ca10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA10 16632 bytes
SHA-256: 371c278b0fe2f7e39c337d78063d611fdf6affd4741e431dcc9bee30ea0bca53
font_01_sfnt_off0000f41e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF41E 10920 bytes
SHA-256: 452a7fc675a8643f09d124d6a3720e4aa4b88bffbd4ccf5004651b1b784a5037
font_02_sfnt_off00010d63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D63 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1