Malicious PDF — malware analysis report

Static analysis result for SHA-256 768d5ae87f9567c7…

MALICIOUS

PDF

85.2 KB Created: 2021-08-11 21:44:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ea65b7bec63d7e31d118233b96de0e14 SHA-1: 3027700d633bbddd23d76f243cc2a97e6feaed02 SHA-256: 768d5ae87f9567c73281f9dd892fd0499e01471fc53c6e3f5ed9a80032893ec0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains a large number of external links, many of which point to websites hosted on compromised CMS platforms or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites for phishing or further exploitation. No scripts were extracted, and the document body was unreadable, limiting the analysis of specific user-facing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://alliusie.com/userfiles/file/jofukowuxufojinugin.pdf In PDF document text
    • https://q-web.ro/wp-content/plugins/super-forms/uploads/php/files/4ji723fb2h7c30d9fr0fnd8bbl/43615698596.pdfIn PDF document text
    • http://kimhoatra.vn/upload/fckimagesfile/bevaxaganepeg.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2ba4d9b678---55059107628.pdfIn PDF document text
    • http://walkofagesvt.org/clients/0/0e/0e42319052772b195a43ba3ede0f03e0/File/9390667747.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/37e55f541t7bksvkqr9umrv972/49519227964.pdfIn PDF document text
    • https://peoplesmodelinternational.com/ckfinder/userfiles/files/42732754317.pdfIn PDF document text
    • http://myjobcareer.net/userfiles/file/2021072510300773499.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210728031735468.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/6221e0cd8c527ec624c6791d1a649a90/niwovixa.pdfIn PDF document text
    • http://slp72.com/clients/7/7b/7b902bee17765b19ebdde6030f24742d/File/xapuretugitubapelera.pdfIn PDF document text
    • http://judyzscotties.com/clients/1/1f/1f1ef5c9f72ce0e5bea5babf356718c6/File/87858121390.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/16077f790e18f3---rivasudalamatov.pdfIn PDF document text
    • https://cobrawire.com/userfiles/files/43293529212.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/v59tlli0m85sgou12fp5sfihko/43530204625.pdfIn PDF document text
    • http://agriturismofattorialucciano.it/ckfinder/userfiles/files/86991230665.pdfIn PDF document text
    • http://mondoacquapiscine.com/userfiles/files/15854159650.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/3056b9b695d554b256e6d96826d99b83/22726377430.pdfIn PDF document text
    • http://ccforum.kr/uploads/file/1626860743.pdfIn PDF document text
    • http://topoint.cc/userfiles/fckFile/20210621081650.pdfIn PDF document text
    • http://namngonviet.vn/user-/files/siledukigatofupuxanewonu.pdfIn PDF document text
    • http://a-mega.ua/images/uploads/file/63292500970.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=exame+de+fezes+como+fazerPDF 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_off0000e9c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9C7 18424 bytes
SHA-256: 0cd7e5d35cd7fc4fb859465a870161ac6ad27bac1a0c8fc9fbcf2f13f5e7dac9
font_01_sfnt_off00011633.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11633 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012e4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E4A 10444 bytes
SHA-256: 02a259e5c7566052ee74d2283c5d371d868da35dd348d4e73a6524bd9af798e7

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