Malicious PDF — malware analysis report

Static analysis result for SHA-256 6dc3564652edca1d…

MALICIOUS

PDF

79.7 KB Created: 2021-09-17 18:50:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 137a54ab74a545c5bc340bb66b740d91 SHA-1: 1592ce20eb0c6d818a1b7cd896b86552ce4d3a3d SHA-256: 6dc3564652edca1df4974ccb9b7da8db1af606e6b31af637ccf9c6031c12dd37
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_URI and EMBEDDED_URL heuristics indicates the document's primary function is to host and present these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://huntic.ru/uplcv?utm_term=how+to+transfer+downloaded+music+to+sd+card PDF link annotation
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b054c95dcd---57238883423.pdfIn PDF document text
    • http://sayarbobinaj.com/file/11915195446.pdfIn PDF document text
    • http://stark-tools.ru/images/uploaded/fewuvobigajarebutix.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/9b1e59a0711ac12c04635b80ddd26058/vakawubogatufotele.pdfIn PDF document text
    • https://dcmheavyequipment.com/admin/images/file/84912482173.pdfIn PDF document text
    • http://gdlianyu.com/uploadfiles/file/15888764973.pdfIn PDF document text
    • https://www.phuketvillarentalandservices.com/ckfinder/userfiles/files/litipebuzin.pdfIn PDF document text
    • http://hoanggiaphatland.com/uploads/image/files/1980003601.pdfIn PDF document text
    • http://benardoutlite.com/admin/fckeditor/fckdata/file/kujunonip.pdfIn PDF document text
    • http://irodaszer.lukinserv.hu/file/kizebulotipesutijigugu.pdfIn PDF document text
    • http://denge.aero/upload/files/nazazabemidi.pdfIn PDF document text
    • http://abpjseah.news-read.com/upload/files/fulalorigudogazililusib.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134a06518698---68973879910.pdfIn PDF document text
    • http://hotelgiottotorino.com/userfiles/files/javaxigajenatagako.pdfIn PDF document text
    • http://zeguvietnam.com/uploads/ckfinder/files/sijuvule.pdfIn PDF document text
    • http://jiin-torng.com/uploadfiles/20210906194802.pdfIn PDF document text
    • http://gaushalango.com/uploaded_files/userfiles/files/sotexufekigu.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/beb03a9e59454ee1353794d2242a2c3c/betasarevarixosokirozazug.pdfIn PDF document text
    • https://nichecnk.leaddeehub.com/userfiles/files/jubanisovozobo.pdfIn PDF document text
    • https://asoriofrio.org/ckfinder/userfiles/files/3086212657.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613dc21a88709---96764306378.pdfIn PDF document text
    • http://www.dkmodels.net/ckfinder/userfiles/files/jasenopidis.pdfIn PDF document text
    • http://teresachild.com/upload/files/pimojakibewikexetexazut.pdfIn PDF document text
    • http://art-wonders.com/ckeditor/ckfinder/core/connector/php/uploads/files/xerarironosex.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_off0000d3ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3EC 16952 bytes
SHA-256: 35b9d8a3cbcd229931e4d9bd1dd9bd259d87e05ea0e4751bf84c0f3b71f5869d
font_01_sfnt_off0000ff7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF7B 10816 bytes
SHA-256: bd3091b1db3d786ba1be55ac179e9d64048831a30a3cc0b4378fd133c7973075
font_02_sfnt_off0001186b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1186B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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