Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8b647396853aa5d…

MALICIOUS

PDF

79.4 KB Created: 2021-09-20 23:23:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 10dfdd0cc15597e568f6d92e7c62c52d SHA-1: a4a1b37f9541bdf550d0b4b2aa92e8677dfea279 SHA-256: a8b647396853aa5dd4f5530eba69c26f23a17bc9ecf0a173b596252c9539953e
164 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 phishing or trojan payload. The heuristic firings suggest it functions as a link farm, potentially leading users to compromised WordPress upload storage or other disposable hosting sites. While no scripts were explicitly extracted, the presence of embedded URLs and the 'Fake invoice / payment lure' heuristic strongly suggest a phishing attempt designed to trick users into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://xfswchem.com/upload/files/26942261323.pdf In PDF document text
    • http://e-motyle.natura2000.pl/imgturysta/files/89113049788.pdfIn PDF document text
    • http://mediedil.eu/userfiles/files/rudebizaniwupug.pdfIn PDF document text
    • http://boldogelet.hu/media/busisil.pdfIn PDF document text
    • http://aumnat2car.com/ckfinder/core/connector/php/upload/files/gorunofalijodaj.pdfIn PDF document text
    • http://arohitourandtravels.com/userfiles/file/lelaxarobajenusopebor.pdfIn PDF document text
    • http://aquamedia.cn/ckfinder/userfiles/files/sodotozositiweneku.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133d48762e76---68771994726.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/acf16d1228b04a2cb61bde15b76648a3/15137867411.pdfIn PDF document text
    • http://www.luna1956.com/images/library/File/65218016749.pdfIn PDF document text
    • https://mimpiindah88.com/contents/files/kasopojodiregovukozavegu.pdfIn PDF document text
    • https://serihosting.com/calisma2/files/uploads/72870746660.pdfIn PDF document text
    • http://iucecb.com/files/file/90693065774.pdfIn PDF document text
    • http://mikomisushi.com/uploads/files/zulixaximirefip.pdfIn PDF document text
    • http://hurtglass.pl/upload/file/besatu.pdfIn PDF document text
    • http://szjwwj.com/userfiles/file///tawefes.pdfIn PDF document text
    • http://werder-ritter.de/UserFiles/File/bubisawakufafijulu.pdfIn PDF document text
    • https://jajugroup.com/ckfinder/userfiles/files/zarewokaxupibenawubekabof.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/303c01b157ba3bd14fef61d4bd6f5b9c/56281921392.pdfIn PDF document text
    • http://dominant.name/userfiles/file/jolaxijo.pdfIn PDF document text
    • https://www.caissedesecolesdu5eme.fr/backoffice/ckfinder/userfiles/files/jigaxudopisakudobi.pdfIn PDF document text
    • https://eltechma.com/zdjecia/fck/file/sepatupefazafef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+write+in+care+of+on+an+envelopePDF 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_off0000d345.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD345 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB57 17356 bytes
SHA-256: 7b20a7e8d0eda8547d18247bb60456953c5f0ea5e6b46786cb4167ceef31b7b3
font_02_sfnt_off00011812.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11812 10448 bytes
SHA-256: fccbe66b380df05bd54d1858df7b91a18d14f3fe6e33ce9276af1de4330cc899

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