Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e2a4523b3eb7260…

MALICIOUS

PDF

92.8 KB Created: 2021-08-26 07:03:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d7ae40b3a6f77c0641b2d9bc57bfdb70 SHA-1: 855b099241e37bcf2fa34f84a2cf9e7db533a684 SHA-256: 6e2a4523b3eb72601bbc3e781dcf8a74980c1241433fe434ec3a3e0f3907e7cb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many of which point to compromised websites or disposable hosting, indicating a link farm designed to lead users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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 http://aodaiminhhanh.com/app/webroot/uploads/files/94147174594.pdf In PDF document text
    • http://zaragozalawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/47598054555.pdfIn PDF document text
    • http://hk-dcc.com/wp-content/plugins/super-forms/uploads/php/files/1g5u3nberoe0hin886r32b0vrn/sukimovugitodi.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16080d13bb5377---nofasubu.pdfIn PDF document text
    • http://jinistudy.com/_UploadFile/Images/file/89104988416.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6cc9716b4f---58601906649.pdfIn PDF document text
    • https://perfecthospital.org/FCKeditor/file/12975698531.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087bb6966eaa---39510367315.pdfIn PDF document text
    • http://palestraarkadia.it/userfiles/files/wirujirapimafodibenuzajak.pdfIn PDF document text
    • http://osheamaloneynylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/69394411947.pdfIn PDF document text
    • http://writtenmail.com/upload_images/file/lajele.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fac855e31e9---rinibutasixunidixofelokuz.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/nisimidawetoxaxuf.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/17172e0f1fdfed6b9e22a90b5b9647b6/2414841408.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161217e212487f---sulovuvawekireradaz.pdfIn PDF document text
    • http://ikhmongol.mn/ckfinder/userfiles/files/60359854846.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16117ceb6d4173---80428947393.pdfIn PDF document text
    • http://grappin-annat-como.com/userfiles/grappin-annat-como.com/file/49774134435.pdfIn PDF document text
    • http://csc0898.com/userfiles/file/20210627005233_yut6h2.pdfIn PDF document text
    • http://k1a.ru/images/files/file/94956240291.pdfIn PDF document text
    • https://onlineadda.net/ckfinder/userfiles/files/87712426374.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a5b6ecd6cdb---kovinavapunil.pdfIn PDF document text
    • http://flemingdecal.com/uploads/assets/file/47994961087.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/orhq7bl983trl5l74cchseqtt8/diraxipunekomulowoser.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=casteism+in+south+indiaPDF 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_off00010a3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A3B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012252.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12252 10500 bytes
SHA-256: ab652891231acb0b38b5552333fa49f5e16524be977ee19b7bb0e93a4924fc21
font_02_sfnt_off00013a01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A01 16800 bytes
SHA-256: a337b84984c2c38a32add84aa0704a6a5bbeec641eeb6f415086cbebed1e4e7d