Malicious PDF — malware analysis report

Static analysis result for SHA-256 d49a40541c477457…

MALICIOUS

PDF

91.6 KB Created: 2021-09-11 04:07:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a7da8a187772affe39b2c2b6f12e10a9 SHA-1: f10de291223678d9a10de2c3344d76c1b0101dfd SHA-256: d49a40541c477457208b3dcd514649675ba6b44bf1d4712d4c3dbcaf7b577c28
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many hosted on compromised or disposable domains, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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 https://philabc.ru/uplcv?utm_term=live+net+tv+free PDF link annotation
    • http://nfc-lampang.com/user_img/files/53446814990.pdfIn PDF document text
    • http://monarchiaerembolt.hu/tmp/muzagetegaberapesej.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/3001955873.pdfIn PDF document text
    • https://medsplus.us/admin/images/file/melujepinaderuroxini.pdfIn PDF document text
    • http://hstechno.com/userData/ebizro_board/file/ronulunanu.pdfIn PDF document text
    • https://mallorcaboom.com/res/wysiwyg/file/61998565128.pdfIn PDF document text
    • https://hiroyoung.com/data/files/wokap.pdfIn PDF document text
    • https://rmp-familienanzeigen.de/cms/files/zatilojivuti.pdfIn PDF document text
    • https://textosolutionslinguistiques.ca/upload/editor/file/4167270925.pdfIn PDF document text
    • http://dogalakustik.com/depo/sayfaresim/file/waxinowewa.pdfIn PDF document text
    • http://myshiou.com/uploads/files/202109110610142967.pdfIn PDF document text
    • http://hkxhjfc.ltd/uploads/files/20210904163000.pdfIn PDF document text
    • http://triple-a.co.th/ckfinder/userfiles/files/wirip.pdfIn PDF document text
    • http://seamacros.com/upload/file/vebibujenazafumonaduradu.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/161331bf6587dd---73374508832.pdfIn PDF document text
    • http://underbutter.cz/download/foto/sikagijeroxo.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/oadfrbf99i7fali1l4jjnvslj7/40554480657.pdfIn PDF document text
    • https://confidence-ist.mktechsol.com/ckfinder/userfiles/files/57718393800.pdfIn PDF document text
    • http://baldonimarcostudio.eu/userfiles/files/4545790770.pdfIn PDF document text
    • http://sintjorisparochie.nl/userfiles/file/35676458400.pdfIn PDF document text
    • http://21cedu.com/pds/userfiles/files/gepofemot.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130084b7833a---sumazitipoluju.pdfIn PDF document text
    • https://greenlandpark.com/uploads/files/86589761531.pdfIn PDF document text
    • http://sinching.com/uploadpic/files/202109110446188478.pdfIn PDF document text
    • http://hairfibers24.com/upload/file/80110701340.pdfIn PDF document text
    • 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_off00010533.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10533 9736 bytes
SHA-256: 3e2ee0d70eea1f729122a43e4ef9b6721e28c7481e31d030c5b1e74edeac182c
font_01_sfnt_off00011a85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A85 17588 bytes
SHA-256: eff29d939827ff38674038f100502291bebca9c7bd4501f7fd47304612d8a6ea
font_02_sfnt_off00014881.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14881 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1