Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c160fd1b7ab5ab7…

MALICIOUS

PDF

94.5 KB Created: 2021-07-06 10:15:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 87a09d5c6152abf575d2ce86ea427c7f SHA-1: e717e0edf8c00076189bf597dd31718d0c769a37 SHA-256: 0c160fd1b7ab5ab713e006ef6bff422f23997c9c4e4334dfd2ddb371e442ca91
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites, suggesting it's used for phishing or distributing further malware. The presence of a link farm on disposable hosting further supports a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/782b6478e28f10bd00d32aee790372d8/fogoruzepupuwutudotafuw.pdf In PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090ed8f301f8---kosuzobefefofitijis.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/micrf46ndu2nc0gqc9r68c553d/49879406730.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160805b731230b---zadojorenonelosirikajatak.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/67592191175.pdfIn PDF document text
    • https://universal4shipping.net/userfiles/file/xidagomut.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/odh7m4mv45m6aalhfe689us8n2/22628134591.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3929a3c3b---35268786386.pdfIn PDF document text
    • https://transit-connection.com/userfiles/files/20560039386.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/a5f987fe865709d45e7294a0b7dcf462/52581434715.pdfIn PDF document text
    • https://transpack-krumbach.de/_upload_bilder/_filemanager/file/46002822122.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f16d3c912c---xoxeripulebefuluwojujafo.pdfIn PDF document text
    • http://mstreatmentadvances.com/userfiles/files/wivavanodixiwonejuxuko.pdfIn PDF document text
    • http://kasintorn.com/images/upload/files/fijufufamolonapizibix.pdfIn PDF document text
    • http://texmet.pl/userimages/file/mizitirowudevowot.pdfIn PDF document text
    • http://allaboutdowney.com/userimages/vajegibatitelowogog.pdfIn PDF document text
    • http://conservativista.com/js/ckfinder/userfiles/files/86820946802.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/lf544pk8jq2mhk2cbkgjd6kba1/gebozetesidiniwujugirun.pdfIn PDF document text
    • http://bereanbaptistashton.com/clients/1/1c/1ca8668e480cca1e897b6add33210fc6/File/76303947767.pdfIn PDF document text
    • http://brightwayconsultancyservices.com/userfiles/file/zafugi.pdfIn PDF document text
    • https://burmesecatclub.nz/wp-content/plugins/super-forms/uploads/php/files/4470ae110500eeef1b1e15e761cfee06/tukakopuxa.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/shiv9nn0hqqpjklgk1a1jib176/55074171292.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/83n3bkeqlam9c4gnu3sfdldl10/guxog.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/709a253a126e5cc9aab4b29618136975/jawiwugagojuzo.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160ac86452f9b9---51785119331.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f2f03a780e---texawozotaf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=interview+for+mcdonalds+questions+and+answersPDF 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_off00010c3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C3D 17696 bytes
SHA-256: 2a1e7c72b1b635848525d5398d8b0602980a5006be2a18f2e2c6ba9779642ba8
font_01_sfnt_off00013ae3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AE3 10988 bytes
SHA-256: 72921bdf294a672766278cfe8e981133d30ce6e10df344af95fcd248b00828ff
font_02_sfnt_off00015444.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15444 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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