Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab5243890dc1239e…

MALICIOUS

PDF

83.9 KB Created: 2021-09-16 00:29:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5382db8cff394732c3a9e5dfa896e9da SHA-1: bad4dcaf231c0536b787359a836615daf064e6c0 SHA-256: ab5243890dc1239e89344911addd8565dd0d27b0bf3b0b1c7638c968a055c677
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to distribute malicious content or engage in SEO spam. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://wastran.ru/uplcv?utm_term=super+mario+bros+wii+u+rom PDF link annotation
    • http://samurairamenbar.com/uploads/files/nivusaxiboxavumokel.pdfIn PDF document text
    • https://bcm.es/files/galeria/files/xofukomow.pdfIn PDF document text
    • http://konsultacjenaukowe.eu/Upload/file/44537795882.pdfIn PDF document text
    • http://tatugigo.com/ckfinder/userfiles/files/87945098415.pdfIn PDF document text
    • http://suliaok.com/v15/Upload/file/202195197148858.pdfIn PDF document text
    • http://marcth.pl/media/fck/file/68122720685.pdfIn PDF document text
    • https://dollarplus98.com/images/upload/files/fapokodusuvanaximawewone.pdfIn PDF document text
    • http://bibrka-school.org.ua/ckfinder/userfiles/files/repofojarilinesuravo.pdfIn PDF document text
    • http://resortcrimea.com/ckfinder/userfiles/files/nugazogepevagenawasewam.pdfIn PDF document text
    • http://architettipassarinmarzotto.com/userfiles/files/tubirimesebagefawanipo.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614139d572c15---65538769026.pdfIn PDF document text
    • https://okinawa4d.com/contents/files/18841810315.pdfIn PDF document text
    • https://parfumzone.ro/files/file/nilol.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/6f0bd25f495e09d54865177f3acd01c3/10301698078.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613200211b7ba---66393214015.pdfIn PDF document text
    • https://marikakozmetika.hu/editor_up/77057910031.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138f1067207c---pesijijonijevedono.pdfIn PDF document text
    • http://www.musicboxpiano.com/contentfiles/37585365100.pdfIn PDF document text
    • http://haozuowenwang.com/imagefiles/file/68846757999.pdfIn PDF document text
    • http://mastervin.ru/files/file/rasejigoda.pdfIn PDF document text
    • http://whuntex.ru/userfiles/file/65111354897.pdfIn PDF document text
    • http://loaamtran.com/files/usersfiles/files/lesabamoroxisetifapire.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d0bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0BD 10568 bytes
SHA-256: 46a090d1dd7b18496676a91babac377e9f8ba846807dbe2eaf336c474e95fff0
font_01_sfnt_off0000e8a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8A7 21464 bytes
SHA-256: d54a525c6914480a1fb04038f3ca22ca786a3de545505f1dfb16b902e2496992
font_02_sfnt_off000120b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000138c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138C1 1820 bytes
SHA-256: ef4c56b83544acc0eae329b123dcb13384a4443b8ee25b6b011fcec9f25c534c

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