Malicious PDF — malware analysis report

Static analysis result for SHA-256 106ad47d886f9c19…

MALICIOUS

PDF

93.5 KB Created: 2021-09-19 12:54:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d4453d422babcfc8140258a0d3367e65 SHA-1: a75600fc7cf7b29ea56654a69646fda1e408ecf6 SHA-256: 106ad47d886f9c194d1f83db2b775e30c8e7f9c38404f158b030df15b3136d61
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://annassteen.com/ckfinder/userfiles/files/vezefuzufafukudugofot.pdf In PDF document text
    • http://metalzilembo.it/userfiles/files/12749433049.pdfIn PDF document text
    • http://cachnhietwin.com/luutru/files/xobepoxuxojaz.pdfIn PDF document text
    • http://toroisg.com/public/images/files/dadisamolaremo.pdfIn PDF document text
    • https://orsam.org.tr/paketler/ckfinder/dosyalar/files/bukob.pdfIn PDF document text
    • http://ping-property.com/user_img/files/sezufivajizijos.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144b43c46c4f---90916096185.pdfIn PDF document text
    • https://autotronics.vn/userfiles/file/27683893255.pdfIn PDF document text
    • https://gkia.org/kingkong/userfiles/files/foputezofi.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/161315defb83c7---sikek.pdfIn PDF document text
    • https://evermoral.hk/upload/file/1630525762.pdfIn PDF document text
    • http://schokofontaenen.de/idata/54187420424.pdfIn PDF document text
    • http://tonghuichem.com/upload/files/zesos.pdfIn PDF document text
    • https://songhongresort.com/img/files/dibofelapuloteli.pdfIn PDF document text
    • https://www.auto-ecole-acm.com/ckfinder/userfiles/files/lamizamu.pdfIn PDF document text
    • http://volkshilfe-ktn.at/images/content/files/90727753144.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/161449822d9432---58406991417.pdfIn PDF document text
    • http://danangsculpture.com/uploads/image/files/selonukutepitibenozi.pdfIn PDF document text
    • https://xn--z4qq44i.xn--kpry57d/upload/actfiles/marenisajuvoxinofela.pdfIn PDF document text
    • http://frutapacargentina.com/ckfinder/userfiles/files/55564585676.pdfIn PDF document text
    • http://ahjygjg.com/upload_fck/file/2021-9-14/20210914102336509131.pdfIn PDF document text
    • https://graveyards-fuj.ae/userfiles/files/gafuweleliko.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=kodi+2021+buildsPDF 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_off00010c91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C91 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000124a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124A8 10168 bytes
SHA-256: f01865c67a503c698d5b4e43f7e56ffe9722f7d930d4517498b010e76265194a
font_02_sfnt_off00013b80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B80 17404 bytes
SHA-256: d59a28f113f565924cb74da4e61dbb6c5d09359b7002a6dd1b583382bb0d5809