Malicious PDF — malware analysis report

Static analysis result for SHA-256 be77f818b432629c…

MALICIOUS

PDF

86.3 KB Created: 2021-09-06 14:23:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: fa0be54097601d1503019516ca8d4b1c SHA-1: b1f4715510a10dd356c7817260ccf2e904c0e306 SHA-256: be77f818b432629ce97b13e260c2ef2c1b4bd53e980d0d2eee402bb65f2349f1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised CMS upload directories and disposable hosting domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links. No scripts were extracted, so the primary attack vector is user interaction with the embedded links.

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://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/00c2fc47da0ce6e572b7cdc64f0f6f08/45326301788.pdf In PDF document text
    • https://frisch.ro/files/file/vomutawi.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/d8987145f3c03503bb0ed270bc4d1d21/93494424133.pdfIn PDF document text
    • http://xn--80aamdqpfpr.xn--p1ai/upload_picture/84142301204.pdfIn PDF document text
    • http://thueotodn.com/uploads/image/files/zusiruxugik.pdfIn PDF document text
    • https://alrashed-alsaleh.com/userfiles/files/867544146.pdfIn PDF document text
    • http://schokoladenfontaene.de/idata/45108188668.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b165ad5d640---27142328221.pdfIn PDF document text
    • http://ryukatsu.com/userData/board/file/zemenugesejanuwowajawok.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608ba21fd9ef0---69214888121.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160f7f472696cc---savukafo.pdfIn PDF document text
    • https://brakos.it/file/50049053823.pdfIn PDF document text
    • https://alshaabcoop.com/userfiles/file/kamivosukilixu.pdfIn PDF document text
    • http://poney-club-romilly-aigre28.fr/userfiles/file/mexere.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/qs89fe08lqj2lr80u581b331hc/54892939687.pdfIn PDF document text
    • http://glotecgh.com/upload/editor/file/80662945747.pdfIn PDF document text
    • http://poorclarescork.ie/images/52030268017.pdfIn PDF document text
    • https://havadisname.com/upload/ckfinder/files/pafatetinamuxe.pdfIn PDF document text
    • http://bassbasement.org/userfiles/file/roboguto.pdfIn PDF document text
    • http://xn--49s538bo8ux8c.net/userfiles/file/17251313987.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160744638c29fc---vazugiropuvidararuke.pdfIn PDF document text
    • http://www.prunay-en-yvelines.fr/ckfinder/userfiles/files/vadojibuxonoj.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607e5efe5c4ba---60051387897.pdfIn PDF document text
    • http://760_709737661.mildmedia-dev.eu/uploads/userfiles/files/93854952959.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=body+parts+exercises+pdfPDF 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_off0000e980.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE980 10732 bytes
SHA-256: 266b7c039cc27dc05a24b4e8e210efe366c66f6f3e5415ad7127f18f0c20916a
font_01_sfnt_off00010269.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10269 19080 bytes
SHA-256: 06f639db3d5e2160b66e1b95fabfa58a39cde745871dddc9d1f38764c0f50f4f
font_02_sfnt_off00013377.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13377 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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