Malicious PDF — malware analysis report

Static analysis result for SHA-256 74c37ac15d1c822a…

MALICIOUS

PDF

84.0 KB Created: 2021-09-14 14:22:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 11879fa6f7861dee39b2d105a10a00cf SHA-1: 4d81c92f28ea4fc0d9408c5e16874443ddaeffc7 SHA-256: 74c37ac15d1c822a820e9f5eead4e03184af5a9842aa85fee599b6b4f5eaefc8
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to numerous URLs, many hosted on compromised CMS platforms, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://weilandensemble.nl/ckfinder/userfiles/files/27167140549.pdf In PDF document text
    • http://jjw-led.com/userfiles/file/fodid.pdfIn PDF document text
    • http://peggylittlelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/28826082971.pdfIn PDF document text
    • http://vestmorecapital.com/images/epost/48049659330.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/iu5r8arpeum6ldho9of4gsq4o0/lijikemekotofutepux.pdfIn PDF document text
    • http://birkhoffhi.com/userfiles/files/36625475618.pdfIn PDF document text
    • http://bordahusfeldolgozo.hu/editor_up/mevotigoxotokuzokiti.pdfIn PDF document text
    • http://spy-military-labs.com/userfiles/file/80274223583.pdfIn PDF document text
    • http://ssaisarang.com/ckfinder/userfiles/files/jojikojuvozemenonaxufej.pdfIn PDF document text
    • http://potlista.com/file/files/rogabezufatukaruru.pdfIn PDF document text
    • http://websurin.net/UserFiles/File/81404747561.pdfIn PDF document text
    • http://www.derbysignandgraphics.com/uploads/file/donepikuvajibabazebi.pdfIn PDF document text
    • http://prakseologia.eu/userfiles/file/73071850083.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130411975d5a---93044306865.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16132529cabbd0---18312787571.pdfIn PDF document text
    • http://majortaylorride.info/images/uploaded/file/wifajimajefatazexetega.pdfIn PDF document text
    • http://kasargod.net/uploads/file/xijijifugejenur.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/ca8f3bb6996aacbba201455fb22bd557/97306093841.pdfIn PDF document text
    • https://concertwristband.com/resimler/files/9172275831.pdfIn PDF document text
    • http://skonasystems.com/userfiles/file/mikar.pdfIn PDF document text
    • http://conelser.hu/fck_uploads/file/tibofojiguxanilazafonuko.pdfIn PDF document text
    • http://dc-a0dcf319a153.breakthroughsport.com/userfiles/files/96815650039.pdfIn PDF document text
    • http://king-ber.com/UploadFiles/file/20210907100915216.pdfIn PDF document text
    • http://petswithlove.com/cvsprojects/SSK/Source/2.0.0/images/files/suxapevafemafisabowale.pdfIn PDF document text
    • http://theponghop.com/upload/files/27629599022.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=cara+backup+contact+android+ke+iphonePDF 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_off0000e2a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2A4 10760 bytes
SHA-256: 283a16eaf3568eb85a7166bdb5626195efa676f1a2808635881c0204218e8b57
font_01_sfnt_off0000fb22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB22 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011334.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11334 17820 bytes
SHA-256: 6d726f47be682d849602747849f013791f160505b9b15a16823656ed14e5f2e1