Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f4f5c626193c3c5…

MALICIOUS

PDF

67.7 KB Created: 2021-10-03 20:00:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: f62bb78c98d3f442bc3a9e99e87e4302 SHA-1: ede929980d75244c965ec6204e5dcdb4e01d63d8 SHA-256: 0f4f5c626193c3c50968477a595cdae0756860b420950a8f75ab4df4a4892a2f
176 Risk Score

Malware Insights

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

The PDF is identified as a phishing lure due to its image-only nature and embedded action triggers. It contains a link farm pointing to multiple unknown PDF files hosted on compromised CMS upload directories, suggesting an attempt to distribute further malicious content or redirect users to phishing sites. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f11c40a89e---wufebuwe.pdf In PDF document text
    • https://heatingboiler.ca/fck_upload/file/2373384023.pdfIn PDF document text
    • https://amzentransportationindustries.com/admin/imagetemp1/file/95083174343.pdfIn PDF document text
    • http://asia-test.informacittadino.net/media/files/93511327037.pdfIn PDF document text
    • https://oxi-dental.ro/imagini_ws/31984261098.pdfIn PDF document text
    • http://tainanrup.longi.tw/uploadfiles/files/20210905_091002_6111.pdfIn PDF document text
    • http://jrecchina.com/ckeditor/ckfinder/userfiles/files/rufuropojavofa.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16155a3c640b38---85114476685.pdfIn PDF document text
    • http://bernardthevenet.fr/ckfinder/userfiles/files/ximoluge.pdfIn PDF document text
    • https://themalc.org/files/file/fidoritevipet.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b74def1582---60835790905.pdfIn PDF document text
    • https://groupburuemas2.com/contents/files/koramazamifodowezagusa.pdfIn PDF document text
    • https://dukumanis.com/contents/files/68828613778.pdfIn PDF document text
    • http://volandovia.it/public/fileeditor/file/wezax.pdfIn PDF document text
    • http://koddous.com/userfiles/file/80340359594.pdfIn PDF document text
    • http://autosvilar.com/uploads/ckfinder/files/domesusokusegivuzapum.pdfIn PDF document text
    • http://poledance-chrudim.cz/files/file/5020353144.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/54152630182.pdfIn PDF document text
    • https://eurouniversal.eu/ckfinder/userfiles/files/tizonam.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614404ea1d47d---nowususozeseluvofik.pdfIn PDF document text
    • http://daiichihr.com/uploads/news_file/rewoguvenudulunopo.pdfIn PDF document text
    • https://aletihad-group.com/userfiles/files/68881069539.pdfIn PDF document text
    • https://mosconi.net/userfiles/file/55624846296.pdfIn PDF document text
    • https://zivotzaokny.eu/res/file/18846544732.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=safe+to+sayPDF 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_off0000af31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF31 14280 bytes
SHA-256: 838e2bc6a87b6ff43fbfb7fa1703291ea49e8f2b33d5759dc305c9a84fc6ca69
font_01_sfnt_off0000d32f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD32F 10056 bytes
SHA-256: 5f07c98448bda8f0fc965370c8c5c6d94c987fb0889992c7a642ddada0dd329b
font_02_sfnt_off0000e9bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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