Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1f6cf1a97a23de5…

MALICIOUS

PDF

96.1 KB Created: 2021-07-19 13:00:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: a21a9c27e7f3ba46424a83bf4ffdbeca SHA-1: 986e967eaab082941c8fdf3fa487edbc02c49b52 SHA-256: d1f6cf1a97a23de55fac97b9f5f44203f4a38a8d919ebfe042b1184f9c2d4982
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal a link farm strategy, with numerous URLs pointing to potentially compromised WordPress sites and disposable domains, designed to host further malicious content. The primary goal appears to be directing users to download additional malicious PDFs, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9918

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://jpind.pl/userfiles/file/votarenu.pdf In PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/bdc2da53b4883ea992808597cc586f50/42932557672.pdfIn PDF document text
    • https://remoteworkerclub.com/wp-content/plugins/super-forms/uploads/php/files/71f5ae040a91d3d6c7dcbab6c4987e49/sewiwelapepugixejetelawi.pdfIn PDF document text
    • https://xn--z4qq44i.tw/upload/actfiles/podabumuwaxukowiwunuzebet.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c14ae21a2c1---zezenupa.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b474874a28c---budozebubejusetilebunodow.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/dedow.pdfIn PDF document text
    • http://manpukuorder.com/uploads/files/53147698356.pdfIn PDF document text
    • http://seyrimerdin.com/userfiles/file/zerobagevukotuzetuz.pdfIn PDF document text
    • http://www.aadhar-interior.com/userfiles/file/14662048238.pdfIn PDF document text
    • http://lucidarepavimentimarmogenovaealessandria.it/userfiles/files/lumulu.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160919e99bcb98---rojowiradejusowasidaju.pdfIn PDF document text
    • https://tpk-m.ru/files/file/9009732619.pdfIn PDF document text
    • http://geoplan.su/userfiles/file/24831183050.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0f5b42e3cb---sanuga.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/16085750054002---74791934166.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16094107058856---nafivopodagexiti.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/d1vckais51bojj2sjpv176au79/radomutojakogoz.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/taget.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160834a82b0d0b---70061400707.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160735caa35edb---94177423763.pdfIn PDF document text
    • http://beveragesgs.com/userfiles/file/rajolizosisawovaze.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160909c31abc9c---zoxumazuxabawafipefikora.pdfIn PDF document text
    • https://bonpetsupply.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e1be407972---wosav.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160e00497c3f71---25421054140.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=you+are+the+most+beautiful+woman+in+the+world+quotesPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fe15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE15 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001162c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1162C 11076 bytes
SHA-256: 3af8d54a97a3e0946a5ba4d5377647b41d79930eb24497c6efc2a82069e62430
font_02_sfnt_off00012f9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F9D 16312 bytes
SHA-256: 7d15b2d6d265aaca51dda18faee70a1b8fa9d95ed54cb111fb0895789092f9ae
font_03_sfnt_off000145a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145A4 17128 bytes
SHA-256: 72fd149bef13d13d158dd56e264d868e39200a4d7164488067f42a8feb51c4d0

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