Malicious PDF — malware analysis report

Static analysis result for SHA-256 5720e8cb3d7aff91…

MALICIOUS

PDF

83.4 KB Created: 2021-09-17 07:01:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 002c66b18c99a07503a39599da0944d7 SHA-1: ca72f7643f164904f449ab805178f432fb596ab0 SHA-256: 5720e8cb3d7aff91470536000432b27fc68b8d7be2eff46d1b681c607711bfba
164 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to potentially compromised websites and a visual download button, indicating an attempt to trick the user into downloading a secondary payload. The document body is heavily obfuscated and unreadable, providing no further context on the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fc0ae57370---12041287783.pdf In PDF document text
    • http://chineseclothingonline.net/File/folaxexixenebovijumapu.pdfIn PDF document text
    • https://mgs-on-track.com/app/webroot/userfiles/file/bizesunivitemaxasafipoto.pdfIn PDF document text
    • https://marathonblainville.com/userfiles/files/12820481400.pdfIn PDF document text
    • http://emilybarnes.com/DEVELOPMENT/VERSIONED/emilybarnes/trunk/sites/default/files/file/pipadubifefiluluxapetos.pdfIn PDF document text
    • https://www.mediawerf.nl/bundles/store24backoffice/ckfinder/userfiles/files/nipika.pdfIn PDF document text
    • http://imaginove.eu/data/Files/94403821042.pdfIn PDF document text
    • http://armiikrajowej36.pl/public/upload/ckfinder/userfiles/files/97497432882.pdfIn PDF document text
    • http://abwlargo.com/uploads/files/naxofebulenijujejubejaja.pdfIn PDF document text
    • http://ilkjv.com/Images/Media/files/nogulagamifowoke.pdfIn PDF document text
    • http://xaydungphongphu.com/uploads/files/xagavawomokizaxa.pdfIn PDF document text
    • http://homokkepek.hu/editor_up/23326516184.pdfIn PDF document text
    • https://hanyauntuktesting.com/contents/files/farudugimuwemono.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/95923489873.pdfIn PDF document text
    • https://dongphuchuytai.com/upload/files/2237949812.pdfIn PDF document text
    • http://johnmarzillier.com/ckfinder/userfiles/files/10395981290.pdfIn PDF document text
    • http://mnogonomerov.ru/uploads/file/boweza.pdfIn PDF document text
    • http://mingmitrcoffee.com/user_img/files/49646872785.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/6i8o81kvlpei8ta4s4rj9p0vq0/rexujumujenoso.pdfIn PDF document text
    • http://print-resource.co.uk/ckfinder/userfiles/files/leremimosokamaladiw.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/16143e837c5cf5---meligalagubomupuwifiwozo.pdfIn PDF document text
    • https://pasarantogel.com/contents/files/guwomifinuxevojasidunowag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=android+ms+word+editorPDF 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_off0000e207.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE207 10268 bytes
SHA-256: 6350910cd2823a6134e259446de8cb8824a7b722737cec9ac486bd61796adcd2
font_01_sfnt_off0000f92e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF92E 18012 bytes
SHA-256: 0f48fafbd784ff6ffd0495d860fa4d71fd00c1abfcff4abd2c53f912356fcf2c
font_02_sfnt_off000127fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1