Malicious PDF — malware analysis report

Static analysis result for SHA-256 28bf7bf69631822c…

MALICIOUS

PDF

70.3 KB Created: 2021-09-05 15:56:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 2d7ce38d5baa73bcd197fa8073ca0753 SHA-1: 4ded00feb9868b46cae23180eaf2d5d4e7c96c77 SHA-256: 28bf7bf69631822cd1e76d0f22488b9f35fe283883bd95c7bc278f2152489f06
124 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to multiple compromised WordPress sites, likely intended to lure users to malicious content. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports a phishing or trojan distribution intent. The file's structure and embedded links suggest it's part of a phishing campaign, likely delivered as an attachment.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3555

Heuristics 5

  • 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
  • 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://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dee10aa44e4---35129004887.pdf In PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/79da434e2457860a28d817f320b7f572/xabozabatefefekide.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088adcdd0fff---29411917254.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160bb2bf627207---26997460664.pdfIn PDF document text
    • http://zbigniewrodak.pl/galeria/file/42260993222.pdfIn PDF document text
    • http://boek.se/bilder_umeny/File/vamezevorobevusaj.pdfIn PDF document text
    • http://www.jasfec.com/imgs/uploads/sizilipiwevobamubej.pdfIn PDF document text
    • http://isisthailand.org/file_media/file_image/file/wewinufujinavatexorerin.pdfIn PDF document text
    • https://fonixkoncert.hu/upload/file/tetirisosuvi.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/35c59b743ae74afbcb33f1557243ca43/3191855092.pdfIn PDF document text
    • http://dhs1970.com/clients/9/98/98bceae81adeaace0f0761aa7b0d12fa/File/12255626221.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2b5128ef14---naraguv.pdfIn PDF document text
    • https://guineaservicesproviders.com/gsp/files/fisikiwezagoxufesux.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/d1rnanpihk42b03j1jgj5gji7j/fuwev.pdfIn PDF document text
    • http://imi.vc/upload/files/rokaviros.pdfIn PDF document text
    • http://cba60.com/clients/6/6c/6c2dd71b6188bc8e8f5adc6209c6f86c/File/69751388658.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc152f59db8---wozutomemarozosagu.pdfIn PDF document text
    • https://www.babetravelling.com/ckfinder/userfiles2/files/72740459733.pdfIn PDF document text
    • http://ecogestval.com/userfiles/file/63899866294.pdfIn PDF document text
    • http://haciogullari.com/depo/sayfaresim/file/furudazidukuwerebuni.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/96bd93eb7cf6c2333bb2dd6017972d7c/30713898362.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087fa357f588---36136370137.pdfIn PDF document text
    • https://www.ijestr.com/ckfinder/userfiles/files/sefeditusikot.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed7c2d8e72---zejemedegikanavekigeribu.pdfIn PDF document text
    • http://www.prunay-en-yvelines.fr/ckfinder/userfiles/files/sinamobi.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612dd0b99a0b3---sojego.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=carbohydrate+counting+worksheetPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d105.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD105 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e91c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE91C 11168 bytes
SHA-256: c219f180b4c00f1d9ab2640a18fda2ac21b5355a19ef95ca80ed2c03564c556b