Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfa8562b598cb8ef…

MALICIOUS

PDF

80.6 KB Created: 2021-09-15 10:01:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2bc9d673b708934b8192f4dc3346811c SHA-1: 0dfbd6729fd44ec2476ce3ae4303aa6ba56bca3c SHA-256: cfa8562b598cb8ef8f2a86257d4326853587947a230a317717e04294b2a12a29
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The PDF structure and embedded URLs are consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://charteriraq.ir/basefile/charteriraqir/files/94755728910.pdf In PDF document text
    • http://stluciachamber.org/uploadedImages/contentImg/file/pasaz.pdfIn PDF document text
    • https://un7un9b3rl1pa7-99.com/contents/files/zeroxufu.pdfIn PDF document text
    • http://bonsite.nl/phpcmsys/file/14443983806.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/6ghf37n9pfe2to50ru2n261ktp/65223760470.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/161305d75b2475---86399933539.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613c1b1210681---nevajupazobijonavi.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16133807749e88---gunufenuguz.pdfIn PDF document text
    • http://jocafoto.com/fotos/file/jesajonoz.pdfIn PDF document text
    • http://gsnursing.in/ckeditor/ckfinder/userfiles/files/nafasimenojivateza.pdfIn PDF document text
    • http://sarkar.ie/userfiles/file/8253318203.pdfIn PDF document text
    • http://mu-rrrc.com/userfiles/file/romatesiruguzitara.pdfIn PDF document text
    • https://ckfinder.pamlskovnik.cz/ckfinder/userfiles/files/pewotesodunolun.pdfIn PDF document text
    • http://nrgmedia.hu/files/file/juxoguvuluzazo.pdfIn PDF document text
    • http://jikaramen.com/uploads/files/jigoge.pdfIn PDF document text
    • http://www.hussco-steel.com/husscofiles/files/fevabesofawidurow.pdfIn PDF document text
    • http://www.bargiel.com.pl/ckfinder/userfiles/files/33148665743.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/2usrqlm8m6ki74ho748ejgoevm/merozekizi.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/161415623c3213---17665125625.pdfIn PDF document text
    • http://viethanit.vn/hinhanh/file/bewofeg.pdfIn PDF document text
    • http://evaemlak.com/userfiles/file///jijizagureniverurefefawu.pdfIn PDF document text
    • http://yuanjen.com/ckfinder/userfiles/files/60763655989.pdfIn PDF document text
    • http://lnaixi.com/userfiles/file/20210904160811_991604190.pdfIn PDF document text
    • http://sendedianqi.com/upload_fck/file/2021-9-7/20210907113658898585.pdfIn PDF document text
    • http://garantc.ru/userfiles/file/18487658157.pdfIn PDF document text
    • http://studiodugnani.it/userfiles/files/tomogasura.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=sophie%27s+world+full+book+pdfPDF 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_off0000d0b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0B9 10760 bytes
SHA-256: 8efb2ca7bab344af0f54c14e499ab626bb8bf76087f681b373615cdc2aa0bf21
font_01_sfnt_off0000e973.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE973 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010185.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10185 18548 bytes
SHA-256: bb28c414dbdd9babc4e93a2e9ac4839042c66e0f953671d146ff94afbc02759f

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