Malicious PDF — malware analysis report

Static analysis result for SHA-256 3facf5cec42dc3a4…

MALICIOUS

PDF

68.6 KB Created: 2021-09-14 08:21:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 98cba3b02fb18c52b3f37f0dc5fb8914 SHA-1: e9d68209be22913481a75aa837c1f700f3d9c409 SHA-256: 3facf5cec42dc3a40d0cf925cb3967b16c562f61128356456975850aa9ab4c8a
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as a phishing lure due to its image-only nature and embedded clickable links. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were directly extracted, the presence of numerous external links, many hosted on compromised or disposable domains, suggests the document is designed to redirect users to malicious websites for phishing or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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 68 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://edu-mate.kr/_UploadFile/Images/file/7819759421.pdf In PDF document text
    • http://tramtronbetong.com/uploads/userfiles/file/11655654507.pdfIn PDF document text
    • http://edmo-cars.nl/images/file/jabigakezasejefimovetejiv.pdfIn PDF document text
    • http://888chji.com/userfiles/files/filuga.pdfIn PDF document text
    • https://cargobull.cz/res/file/53211430520.pdfIn PDF document text
    • https://www.rapn.ru/ckfinder/userfiles/files/roguravof.pdfIn PDF document text
    • https://drhuanghair.com/uploads/files/202109031558122702.pdfIn PDF document text
    • http://lsneotek.com/ckupload/files/12883826979.pdfIn PDF document text
    • http://naturestuff.nl/siteimages/file/56360480964.pdfIn PDF document text
    • https://hotelreviewreserve.com/basefile/hotelreviewreservecom/files/19230292728.pdfIn PDF document text
    • http://instalater-macecek.cz/klienti/devel/sneznerolby.cz/ckfinder/userfiles/files/rovatokokixejoz.pdfIn PDF document text
    • http://alatasfilms.gr/ILC/img/file/95923155198.pdfIn PDF document text
    • http://tea-ra.com/user_data/upload/save_image/files/35104201282.pdfIn PDF document text
    • https://maggies-handmade.com/UserFiles/files/rizivipu.pdfIn PDF document text
    • https://skiclubraonbaccarat.fr/pdf/92001467323.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/phtg8fjovimjgn11anuc4e0l8m/rekakudeb.pdfIn PDF document text
    • https://pgp-puh.hr/fck_media/file/rineduzep.pdfIn PDF document text
    • http://mofrantech.com/userfiles/file/dasabimexiwatel.pdfIn PDF document text
    • http://sochi-vitrazhi.ru/ckfinder/userfiles/files/69936345090.pdfIn PDF document text
    • http://studiogiamberardino.it/userfiles/files/kofoxozefaserivuputaduju.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/5678dd8cac64eef3d125298be729e5da/61719855183.pdfIn PDF document text
    • http://belloverde.net/emailer/file/jinumikosopugebisereva.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/62559434206.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/2f23a4584ca8874b835b3f6a26afb04e/joxadugewawurofaradasu.pdfIn PDF document text
    • http://werkkledingverkoop.nl/images/docman/files/felovezogopopivazizusa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+see+deleted+photos+on+androidPDF 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_off0000b159.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB159 14144 bytes
SHA-256: 7049563899453310b13fd8905dff258307a6c5b77745694f2c4f4c51c2b2c538
font_01_sfnt_off0000d472.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD472 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ec89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC89 10568 bytes
SHA-256: 0ed4ac3e10f87a9d1562b024a66ff2a6aaff8cc1a51937234a927c30083b1dc3

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