Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef8a7cfe91031613…

MALICIOUS

PDF

85.9 KB Created: 2021-09-16 12:35:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: fdd44240f79026efef3162aaeb26df54 SHA-1: c712ceed161db97c00419c88c1e77fe30641d4b1 SHA-256: ef8a7cfe910316136415d9fda0033fb3d411d855a623e53da7f6933fb6504457
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs that point to various websites, many of which appear to be compromised CMS uploads. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for a link farm, suggesting an attempt to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://smidgel.ru/uplcv?utm_term=lovi+app+apk+download PDF link annotation
    • https://zhbiotech.com/CKEdit/upload/files/33758688591.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/466a7313b1da24fd1a4e8422d686b97c/gukuna.pdfIn PDF document text
    • http://matsonconstruction.net/userfiles/file/livubetererun.pdfIn PDF document text
    • https://equinox-e.com/upload/UserFiles/file/lefopepizomojozujovimexok.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/a3e303aeb827f77e43cd04d27ed43804/66254819199.pdfIn PDF document text
    • https://ikansambel.com/contents/files/33718623068.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ca322b5f45---77576225343.pdfIn PDF document text
    • https://aedwea.com/upload/foto/xatevakovog.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612fe12f4bce8---dupuradijuxonubijamevuni.pdfIn PDF document text
    • http://kunmobile.vn/files/uploaded/20210915/file/rorev.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/3hsmrm7gvgg87j1ee11fitim96/lemudu.pdfIn PDF document text
    • https://iagclaims.endataclaims.com/ModCoreFilesUploaded/file/rabufarurez.pdfIn PDF document text
    • https://candica.pl/ckfinder/userfiles/files/37617468736.pdfIn PDF document text
    • http://falegnameriacastiglione.it/userfiles/files/dejejaremasodevu.pdfIn PDF document text
    • https://birudongker.com/contents/files/81929130655.pdfIn PDF document text
    • http://karpatskiles.ru/store/files/91339986076.pdfIn PDF document text
    • http://munnartourism.com/uploads/file/36139908092.pdfIn PDF document text
    • http://leebyenghun.com/new/upload/board/files/62679930307.pdfIn PDF document text
    • https://fallsplat.se/bildbank/file/xiguzozaka.pdfIn PDF document text
    • http://webinaris.blog/ckfinder/userfiles/publics/files/vekomupedovitoworalewurug.pdfIn PDF document text
    • https://saintarseny.ca/sites/saintarseny.ca/files/file/32817581513.pdfIn PDF document text
    • https://408of53crownstreet.com/assets/media/files/99430483070.pdfIn PDF document text
    • https://epgeptech.hu/ckfinder/userfiles/files/kivilavufegosilotinur.pdfIn PDF document text
    • https://www.vignolaweb.it/ckfinder/userfiles/files/71116194893.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_off0000eba3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBA3 18236 bytes
SHA-256: 01b2bd46cd64b61be0b9cfed996a250baed033be56861103c80571a59bd013b9
font_01_sfnt_off00011b0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B0D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013324.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13324 10088 bytes
SHA-256: c1c0d4d1f3084ded55a24af1fe585cba3918e57ec8a064bbdec98361a1bd0f51

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