Malicious PDF — malware analysis report

Static analysis result for SHA-256 727c2cdd94337914…

MALICIOUS

PDF

82.8 KB Created: 2021-09-13 08:30:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 59e7f05a33fb0d5c31073e2a80ec79aa SHA-1: 078e243a6edd9ec5121b76ed9ffa10d557dfa635 SHA-256: 727c2cdd94337914c262f5e3cca5079dcdc2b675095f7a9aba105519515ed1f2
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing or trojan delivery mechanism. It contains embedded JavaScript and a link farm pointing to compromised WordPress sites and other disposable hosting, suggesting an attempt to redirect users to malicious content. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to open a password-protected archive, a common tactic to bypass gateway security.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://unitytradefze.com/ckfinder/userfiles/files/91616286840.pdf In PDF document text
    • http://bapassamarinda.id/assets/ckfinder/core/connector/php/uploads/files/wuxijoxil.pdfIn PDF document text
    • https://rgcsmt.org/ckfinder/userfiles/files/tajefinemupavuwivofatiko.pdfIn PDF document text
    • http://zeci.nl/im/image/dosabativu.pdfIn PDF document text
    • http://ctnphrae.com/ckfinder/userfiles/files/64240905022.pdfIn PDF document text
    • https://sunriseinnjasper.com/nbloom/fckuploads/file/67753175459.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16136306ac4772---perewemusajixobeweke.pdfIn PDF document text
    • https://www.retake.dk/ckfinder/userfiles/files/kevedudututal.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/e4bad249587e248233e604c20a1ff8b5/gasanapuvogotepavam.pdfIn PDF document text
    • http://rsport.eu/yonexshop/static/file/surenesofidiwokaxaded.pdfIn PDF document text
    • http://artstudiodesign.it/userfiles/files/74981035481.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/d3866e06c20a826a770a0b13473bb1c0/87760192165.pdfIn PDF document text
    • http://www.leads-bd.org/app/webroot/js/ckfinder/userfiles/files/miwefakurekupis.pdfIn PDF document text
    • https://mi-stores.com/basketballtotaal/images/editor/file/97093335946.pdfIn PDF document text
    • http://bestorkate.com/uploads/ckeditor/files/46688290699.pdfIn PDF document text
    • https://akconta.com/uploads/files/togutetofimutalulomifi.pdfIn PDF document text
    • https://kuzeyilac.com/resimler/files/fevirasezesoserenozobeno.pdfIn PDF document text
    • http://come2menorca.com/images/file/tazisezeguvad.pdfIn PDF document text
    • https://hobbyschuurtje-webwinkel.be/images/userfiles/file/sufefotupope.pdfIn PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/dotasu.pdfIn PDF document text
    • http://metapolar.hu/tmp/jamivuzan.pdfIn PDF document text
    • https://073741256.com/uploads/files/202109031726405722.pdfIn PDF document text
    • https://cyklo-wellness-penzion-palice.cz/content/vixinun.pdfIn PDF document text
    • http://smwiarus.pl/ckfinder/userfiles/files/33982537670.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=offerte+cellulari+samsung+galaxy+s3PDF 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_off0000debe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEBE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6D5 11072 bytes
SHA-256: b23aae5276a8a023899c7313b609f62994a5aa3c2dc7598069f629fa4ec5f628
font_02_sfnt_off000110ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110BA 17152 bytes
SHA-256: 51617e2efa72ebdca7f94ad040e561d287fecf74bbfd1642484bb30fabef788c

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