Malicious PDF — malware analysis report

Static analysis result for SHA-256 04b75228073e6d61…

MALICIOUS

PDF

67.5 KB Created: 2021-09-17 01:50:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 90fa78dd0f0855a7f73181887157a326 SHA-1: 8b7d8d5b81d43b124e2c2e9777768d0143f18098 SHA-256: 04b75228073e6d61bccf59139d6462e613612f120e819d293a70f0feaeb36dd4
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. It contains a single image and minimal text, typical of a screenshot designed to obscure clickable links. The document hosts a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute malicious content or redirect users to phishing sites. No scripts were extracted, but the presence of numerous external links indicates a strong likelihood of redirection to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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 https://demo-calson.garment-pro.com/ckfinder/userfiles/files/22461652388.pdf
    • http://bielle-srl.com/userfiles/files/bavijoxixozijufak.pdf
    • http://pkynfe.net/userfiles/file/64274590260.pdf
    • http://gzafjc.com/uploadfile/files/32065598533.pdf
    • http://mail-ex.net/userfiles/file/6707093862.pdf
    • https://www.aifimm.it/admin/inc/ckfinder/userfiles/files/19969850319.pdf
    • https://smobiil.eu/userfiles/files/33217742744.pdf
    • https://worldpigment.com/image/upload/File/joxamegusiwurelur.pdf
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16137ffa83fe0d---xabujiminuberoz.pdf
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f6847b9393---wonelenifuwagagurelikek.pdf
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac7b79e29f---93657070334.pdf
    • http://qiangka.com/ckfinder/userfiles/files/mebulala.pdf
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/161307a7ec48c4---kuzarenulexufixexifana.pdf
    • http://unityproductions.com/upload/files/64452260437.pdf
    • http://studioghittigargnano.com/userfiles/files/sowalegiziraserim.pdf
    • https://anukulagrotech.com/ci/userfiles/files/kajiwiputofelameko.pdf
    • http://flygarfield.net/userfiles/file/jawutunip.pdf
    • https://dichvuketoanvn.org/uploads/files/wopafimuwikivesalom.pdf
    • https://ctners.com/ckfinder/userfiles/files/kenuletegesegixil.pdf
    • http://ddgasul.com/userfiles/file/74076126355.pdf
    • https://rockeit.com/userfiles/file/81504363137.pdf
    • http://ttccid.com/userfiles/files/5030135772.pdf
    • https://aquatrustfina.com/userfiles/file/zukoxeropugot.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+check+is+your+phone+hacked
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ad92.bin
9b516a095c14a8a880328632db6ce7e5d17ed63b6d255821c345c48ebf89a0c0
pdf-font-stream PDF embedded font (sfnt) at offset 0xAD92 13820 bytes
font_01_sfnt_off0000cf56.bin
ba2ab9f7c8598405678a88bd86d894a7f3bf6e35c82b8d0eff443fd27f532c49
pdf-font-stream PDF embedded font (sfnt) at offset 0xCF56 10948 bytes
font_02_sfnt_off0000e8c4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C4 16792 bytes