Malicious PDF — malware analysis report

Static analysis result for SHA-256 430a239d8440c429…

MALICIOUS

PDF

86.8 KB Created: 2021-09-03 22:49:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a590414c50998c7499d65ee3369660a0 SHA-1: e6cf43eeb08ed74927b74f0d867e72d0e406954a SHA-256: 430a239d8440c42974eb84f8ea09cbfa2f40f28036719aa7d5c1ba44367c1229
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to compromised WordPress sites and other potentially malicious domains. The PDF's structure and embedded URLs suggest it is part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/0f6ef2cc60dfc4891907876a2423134e/goketifo.pdf In PDF document text
    • http://geoodwierty.pl/files/file/lofikadowexunetutawa.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/7f2d86e724d11a52fc6204a99a1c2f32/84374295544.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/86c9evqb7dpipthokb2uuhnm72/94252955019.pdfIn PDF document text
    • http://badischer-kunstverein.de/ckfinder/userfiles/files/99688863624.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/m0d6epltn2gjl7vbqipd6lrlqb/92101056060.pdfIn PDF document text
    • https://mt-creativestudio.com/ckfinder/userfiles/files/29687736271.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/fd3a797d76d48c53a715339b4cb58eb6/paliwesewawelumi.pdfIn PDF document text
    • https://fizjolech.pl/userfiles/file/20474716669.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/wexikul.pdfIn PDF document text
    • https://primer-spb.ru/files/files/xisada.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/5928lhnrhiavpkps1mbp4kubfv/94062156906.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a85764e4745---14403780641.pdfIn PDF document text
    • http://areawifi.com/DESARROLLO/userfiles/files/setafa.pdfIn PDF document text
    • http://teleserviciomalaga.com/ckfinder/userfiles/files/mutepuxipujugezi.pdfIn PDF document text
    • http://phuclocvienjsc.com/uploads/image/files/newixipupo.pdfIn PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/8930225edaa1de79ea84c433dc98960e/9863643702.pdfIn PDF document text
    • http://asztalosweb.hu/userfiles/file/82592670403.pdfIn PDF document text
    • http://wxeina.com/userfiles/files/97614686671.pdfIn PDF document text
    • http://travisreunion.com/clients/1/1d/1d9c560ef9ee6310b862f4c9d288d7bd/File/28375484539.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1608162ef46454---94070054123.pdfIn PDF document text
    • http://bancasemecanino.com/userfiles/files/4026407619.pdfIn PDF document text
    • http://easttbirds88.com/clients/d/d7/d767393c090093bf18db16876c07b5c3/File/24305939226.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3289256258---tibeserukizodizi.pdfIn PDF document text
    • https://postele-z-masivu.sk/ckfinder/userfiles/files/naxeseredirel.pdfIn PDF document text
    • http://sowa-architekci.pl/userfiles/files/8769707571.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=ibu+hamil+trimester+3+pdfPDF 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_off0000edda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDDA 10904 bytes
SHA-256: afc47fe055d1fd2fd7991c2706b2c41e93fc676cf50c3cfb9e3318883c9a7939
font_01_sfnt_off000106da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106DA 18024 bytes
SHA-256: 1204dd4ae46ed7563053398cd90a391c854c8e59986bca20bfab3ec112a4533d
font_02_sfnt_off000135ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1