Malicious PDF — malware analysis report

Static analysis result for SHA-256 2651f453f00c6cd5…

MALICIOUS

PDF

88.3 KB Created: 2021-09-06 06:13:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: cc373e45481aec97472016dee22863d2 SHA-1: a554717efd5f714b5d34d4ca102bfad60b16c15e SHA-256: 2651f453f00c6cd559a0dea51c839730aaf16889cdf0beef67fb5a68b4a6d028
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It functions as a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting, suggesting it's used to distribute further malicious content or lead users to phishing sites. The presence of external URIs and link farm heuristics strongly supports this attack pattern.

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 https://archism.ru/uplcv?utm_term=phantomjs+html+to+pdf+java PDF link annotation
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/15edc4658d7c81c7442ff21a16f9ddcd/60752501985.pdfIn PDF document text
    • http://dolphinegypt.net/userfiles/file/desavowenopuvuroji.pdfIn PDF document text
    • http://rayanchem.com/d/files/31580709579.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/e0e670b96952186502e687571b30fd33/40516417920.pdfIn PDF document text
    • http://viswinkelindex.nl/images/uploads/98105076948.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/45309128396.pdfIn PDF document text
    • http://world-housing.jp/ckfinder/userfiles/files/gumixejawewopo.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094867fb9696---88885312956.pdfIn PDF document text
    • https://sunwayhk.com/louis/STARKGROUP/ckfinder/userfiles/files/punipenezenogadapo.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/2286d10159d93ccaa660e2ef4d3c60bd/18319959021.pdfIn PDF document text
    • https://xn--faade-mtal-p6a3a.ch/ckfinder/userfiles/files/wexipuno.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607cee3eb7e08---76151488962.pdfIn PDF document text
    • http://barahi.com/assets/userfiles/files/61687703549.pdfIn PDF document text
    • http://kzlo.pl/fotki/fotki/file/ravuwonavi.pdfIn PDF document text
    • http://glavis.biz/userfiles/file/wuwegikaxi.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/bad40b7ee1cb1f810c897be7fad060e4/30402151796.pdfIn PDF document text
    • https://szalkasszorutacskok.hu/app/webroot/files/content/files/41060198119.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/ukc2jj6q67hmlvh588j5l87af2/bikolasawemivipowagizixe.pdfIn PDF document text
    • https://vhssirimpanam.org/ckfinder/userfiles/files/84865534804.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b4a13747b3---gisuv.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/16078d0263b4f8---13787767650.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/6b51238fd9cd3ec584d7c6c1b0e24659/26745023027.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c71063b936b---73257967083.pdfIn PDF document text
    • http://perilatomsk.ru/ckfinder/userfiles/files/37052589063.pdfIn PDF document text
    • https://poolpoint.be/uploads/file/77316820088.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_off0000e334.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE334 10636 bytes
SHA-256: caccc31bba91016c187bb24cbcefdbf0dcd7ba73f3d11a3db4b58a243db5f767
font_01_sfnt_off0000fb67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB67 23904 bytes
SHA-256: 1b00bad5559ba7a84176157fdc34cb09ce50a886145fa60ed438298cd69beed7
font_02_sfnt_off0001394d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1394D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.