Malicious PDF — malware analysis report

Static analysis result for SHA-256 13f66dc8449f42a5…

MALICIOUS

PDF

133.9 KB Created: 2021-07-22 07:51:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 25cbb0a7186e1e8b3f234eee32db4715 SHA-1: 06f7744b99255b9ae6468a826a69d744631fcabc SHA-256: 13f66dc8449f42a5269c1938b176a38bcbc66721b2d05506e4601e1dca2ed77d
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, directing users to various compromised websites, many of which host other PDF files. The presence of multiple external URIs and link farm indicators suggests an attempt to distribute malicious content or phish for information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://ufnk.fr/app/webroot/files/file/vipivinagubut.pdf In PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160a040aaf2aa2---rirosagaxabiwaxawiri.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/da3e4e679dd8a1ae3dedc30e6d8a3d56/52180543073.pdfIn PDF document text
    • http://crediramasrl.it/public/file/79729884148.pdfIn PDF document text
    • http://avondale61.com/clients/e/e2/e25739fb73bf6f2fbed92e75d980d6c5/File/13117224217.pdfIn PDF document text
    • https://ukdirectremovals.com/wp-content/plugins/super-forms/uploads/php/files/68a5b7243569cc84406ee8818bc1d74e/zanividem.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/160f0a4940a486---mexevezikegijiz.pdfIn PDF document text
    • https://alrashed-alsaleh.com/userfiles/files/52331160420.pdfIn PDF document text
    • https://karapinarinsaat.net/userfiles/upload/file/74221968944.pdfIn PDF document text
    • http://millecolori.it/images/file/96011605968.pdfIn PDF document text
    • http://railwaysrailroads.com/upload_files/files/85991174439.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607989e85213a---72508439804.pdfIn PDF document text
    • https://arendic.cl/files/lexokil.pdfIn PDF document text
    • https://creteotels.gr/FCKeditor/userimages/file/pakikuto.pdfIn PDF document text
    • http://olversonfamilyreunion.org/clients/5/51/51a48c89da211807e19ed56f8a1a1822/File/xomuvagisuv.pdfIn PDF document text
    • http://ghhs1968.com/clients/5/57/5762190d0a265df614d1f295a7060a42/File/pixosumubanuxup.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a445a99caca---11023562706.pdfIn PDF document text
    • https://mzr-avocats.com/buddha/ckfinder/userfiles/files/17257706792.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/7cec318b35717d8dbed87c6d9c9b99b1/novimanusotixurek.pdfIn PDF document text
    • http://sequirk.ie/userfiles/file/98179004202.pdfIn PDF document text
    • http://djarkitek.com/temp/vinney/HTML/userfiles/file/torezikopem.pdfIn PDF document text
    • http://dissanna.com/temp/fckeditor/file/ganiki.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/uod9c6sq8h6fe4q2ftrak7s6e1/sozaxizolu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=class+r+driver%27s+license+mississippiPDF 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_off0001abdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1ABDC 17296 bytes
SHA-256: 1cd0e04c59fc4f4b74a287f56c3d64da40e37cccccb52c48474448cab06b08a9
font_01_sfnt_off0001d93b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D93B 10588 bytes
SHA-256: 11231e61ddab50fbbaf961dea827691f2e77d1ccf4eb15a793b933f30c9f193c
font_02_sfnt_off0001f163.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F163 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1