Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1cf604de6676b56…

MALICIOUS

PDF

70.6 KB Created: 2021-09-16 09:52:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 723896eee89fa5ade081ea9402ce3565 SHA-1: c86e51c3b01daa21c66749a55e504bab30afa3b2 SHA-256: c1cf604de6676b56489174f5b0f91a1c264397c2eeb4dc4fd156114012b139f0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains embedded JavaScript, which is a common technique for executing malicious code within PDFs. The document also features a link farm pointing to multiple distinct hosts, suggesting an attempt to distribute phishing content or redirect to malware download sites. The presence of embedded JavaScript indicates an intent to perform actions beyond static document display, likely related to exploitation or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://stepweystudy.com/ckfinder/userfiles/files/repalifupos.pdf In PDF document text
    • http://coytex.net/ckfinder/userfiles/files/sekejupaxodisuvetuli.pdfIn PDF document text
    • https://emilline.dk/ckfinder/userfiles/files/gepepitewexewemusazebuko.pdfIn PDF document text
    • http://inica.org/files/file///vifitavudovusu.pdfIn PDF document text
    • http://printrun.nl/userfiles/files/75810077830.pdfIn PDF document text
    • https://toppelletmachine.com/d/files/42643502150.pdfIn PDF document text
    • http://thanglong.vn-greenenergy.com/ckfinder/userfiles/files/xonekejanesaresederuf.pdfIn PDF document text
    • https://resortweeks.pro/userfiles/file/83621978530.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/64p0c63dsmks5jk12rasv00p35/55891803559.pdfIn PDF document text
    • https://sgotomotiv.org/upload/files/9623897308.pdfIn PDF document text
    • http://boilerservis.ru/uploads/files/faxisoravejitisum.pdfIn PDF document text
    • https://firmabudowlanawalczak.pl/web/uploads/files/9215301833.pdfIn PDF document text
    • http://mirsistem.com/depo/sayfaresim/file/96040754975.pdfIn PDF document text
    • https://alcoolassistance-creuse.net/www/site/js/ckfinder/userfiles/files/lamojikupomutowebix.pdfIn PDF document text
    • http://ledlight-lamp.com/mingyi/images/userfiles/file/muxozopegikasan.pdfIn PDF document text
    • https://sarna-zapiekanki.pl/ckfinder/userfiles/files/94315207745.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/52127971022.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/fmig9o2p58ko35aob5c9lg2nc0/62509715533.pdfIn PDF document text
    • http://idealhca.com/admin/images/file/39855279383.pdfIn PDF document text
    • https://xn----7sbeo1acdy3adh.xn--p1ai/userfiles/file/61824800174.pdfIn PDF document text
    • http://rockbond-aac.com/id-admin/fckImages/file/896655810.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/29o1vqof53mjp98qjmptmbtmnc/96684574897.pdfIn PDF document text
    • http://www.cemeba.com/uploads/ckfinder/files/53696335072.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/jerufave.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16141432243e58---tupowusawuguvitomiba.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=dead+space+android+game+downloadPDF 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_off0000b516.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB516 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD2D 10844 bytes
SHA-256: 991fbafbaa865b3ba9c2aea39d16f60f6dac2e89576abb5432da9976905de115
font_02_sfnt_off0000e5fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5FC 15292 bytes
SHA-256: a014e7a85b7c04269a79b1fdfb1eb7daccbd99513bb50e961d5913aef44d4a3c

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