Malicious PDF — malware analysis report

Static analysis result for SHA-256 99f2d2e6a25c1e6f…

MALICIOUS

PDF

82.5 KB Created: 2021-09-14 01:47:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8f3b8708ab1618aac0e0303d0b56edbd SHA-1: a1c256aef0bae2ade0d7be699b40b5fe24615c48 SHA-256: 99f2d2e6a25c1e6ffd183d9dc9735be15367ebaf0466c6c908836f18ecdc3be6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, and heuristics indicate it functions as a link farm pointing to other PDF documents. The 'SE_INVOICE_LURE' heuristic suggests the document's content is intended to deceive users into downloading further content, likely malware. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious sites, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://www.hermosabeachbungalows.com/userfiles/files/14285293808.pdf In PDF document text
    • http://thephinhmienbac.com/upload/files/35965918760.pdfIn PDF document text
    • https://snowcat.pl/admin/ckfinder/userfiles/files/nulodinufifek.pdfIn PDF document text
    • http://vector-mebel.ru/uploads/files/tofuxofaruzebagomeruwudud.pdfIn PDF document text
    • http://www.morrisjones.co.uk/EditorImages/file/febewewatikuxexanafavele.pdfIn PDF document text
    • https://gulceoyunlar.com/calisma2/files/uploads/denutebemur.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/1e42311d36f3b13af714bdbb119fd9f8/84108079722.pdfIn PDF document text
    • https://tepihtrava.rs/files/82656678223.pdfIn PDF document text
    • http://otvorene-srdce.sk/userfiles/file/81582328741.pdfIn PDF document text
    • http://bhttourist.com/upload/fckimagesfile/52142101052.pdfIn PDF document text
    • http://hykylalumni.org/userfiles/fevadenojamejafobo.pdfIn PDF document text
    • http://topp.pl/_topp/file/begilusoka.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613ea37384827---repinin.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fc8c1887da---19132336757.pdfIn PDF document text
    • http://yangs-ns.com/ckfinder/userfiles/files/20210901165608.pdfIn PDF document text
    • http://bxbrdh.marketsearching.com/upload/files/bopek.pdfIn PDF document text
    • https://mannoorpally.com/uploads/file/8558945734.pdfIn PDF document text
    • http://myucpb.com/userfiles/file/naguzetoxuxenut.pdfIn PDF document text
    • http://phantasos.org/userfiles/file/ladowedivurekuwid.pdfIn PDF document text
    • http://ahrestygz.com/userfiles/files/20210906_045557.pdfIn PDF document text
    • https://minhkygroup.com/luutru/files/21722620126.pdfIn PDF document text
    • http://ktcyy.com/ckfinder/userfiles/files/dobebudo.pdfIn PDF document text
    • https://apartmani-mestrovic-krk.hr/files/kajonigefoden.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=44+chapters+about+4+men+freePDF 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_off0000dbaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBAF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f3c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C6 10828 bytes
SHA-256: 180f6a3faf6a368d575bef8d0845459975335df3fe5567fa00935513f48908bc
font_02_sfnt_off00010c68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C68 18424 bytes
SHA-256: 58b361ad3117490e888c8a2871039be365e9e9ddccbfaf77ac028d940252127b

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