Malicious PDF — malware analysis report

Static analysis result for SHA-256 a24b56d7de5399ea…

MALICIOUS

PDF

92.3 KB Created: 2021-09-05 09:37:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 492169c8786406060d71d36c940fb741 SHA-1: 25255d4a4bdb139a8fad3a7c605432b7e7bdaf13 SHA-256: a24b56d7de5399ea2e3f39b0d68836912a573bd59b20939103bd9e3bb4c4e2f0
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to compromised websites or disposable hosting, indicating a link farm designed to lure users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://robertbah.si/files/file/tijugimemej.pdf In PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1609e2323ea949---vumojadevisofabomipebuzos.pdfIn PDF document text
    • http://anaminfo.com/attachfile/file/jajepetawum.pdfIn PDF document text
    • http://studiotravenzolo.it/userfiles/files/vamunaramexesilidujab.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/73854932060.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607f9b368c530---64853539620.pdfIn PDF document text
    • http://angerdress.store/ckfinder/userfiles/files/84214561323.pdfIn PDF document text
    • http://www.tamtrebinhminh.com/public/files/pesojiwivulibigoju.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612948d6704f6---60715689495.pdfIn PDF document text
    • https://ckmandarin.com/uploads/buvojomewibulezoro.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/46902552fc91db07a7cf36ae658136b4/10009965013.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3ccb9cf78c---48655634909.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/2b7bff1769b3a8a23c3c189a3d99f671/putuxonesurusigetagudob.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0734c1a7f5---totowepipukopoxakole.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072cccae4c0b---96585586179.pdfIn PDF document text
    • http://mylivediamondinventory.com/uploads/files/lavepagok.pdfIn PDF document text
    • http://w-mill.jp/images/file/farubesinajurixebagat.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609a3431e2231---lusow.pdfIn PDF document text
    • http://tunglamgarden.com/images/fck/file/12891044679.pdfIn PDF document text
    • http://simonkuehner.de/gfx/userfiles/files/zapigipesufuvaz.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/7daac481ab3385ffaa1d7efcb1a818bc/vujuruxovuzumeto.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+edit+pdf+text+in+photoshop+cs6PDF 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_off0001040f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1040F 17948 bytes
SHA-256: e157f9d55f7608a7fcc65bff3bfe7a2d9e9940ab7269d5fac6f52e2d00ad8c05
font_01_sfnt_off000132c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132C6 10756 bytes
SHA-256: e2b3a2c78142aaef64eb75db4765c230e6835b627d531713d22f2f2444a20a6f
font_02_sfnt_off00014b80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B80 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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