Malicious PDF — malware analysis report

Static analysis result for SHA-256 da4dc4fd2c5f730d…

MALICIOUS

PDF

95.1 KB Created: 2021-08-25 08:18:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 75bbb507b4e4413abae48c3ac7d9d3fc SHA-1: 4c45ee21480d8eefabe266539324ef572ffe7a5c SHA-256: da4dc4fd2c5f730d1b2e224a81f785e447e1deb3e382909fea4ef4588e91b655
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. While no scripts were extracted, the structure and URL patterns are consistent with a malicious document designed to lure users through a compromised CMS upload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf9dc545ce---60961447904.pdf In PDF document text
    • http://fygl.net/uploads/file/140929548624.pdfIn PDF document text
    • https://nomaquito-travel.com/editor-images/goduj.pdfIn PDF document text
    • https://anna-bel.com/app/webroot/files/userfiles/files/52942484367.pdfIn PDF document text
    • http://mtecommerce.it/public/news/file/82993474277.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/fp7cv3rk6r14la471hrdlkvvbj/61508935998.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c3d74fa2d0f---68828967429.pdfIn PDF document text
    • https://www.esfa.bg/root/ckfinder/userfiles/files/gejebifabuxosobezirewif.pdfIn PDF document text
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608301c97b92d---14381786886.pdfIn PDF document text
    • http://0vote.com/ckfinder/files/tapiremumibuwuvevap.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/ecbbf5088c5be315d8d1ad7b1a24ec5b/gasabuv.pdfIn PDF document text
    • https://supermagnum-bg.com/userfiles/file/gogopudosegebaxib.pdfIn PDF document text
    • https://ymy-tea.tw/upload/files/godixedovakupitawanejo.pdfIn PDF document text
    • http://feach.ie/images/uploads/file/jitosatabela.pdfIn PDF document text
    • https://wrd13.com/force/file/58122308543.pdfIn PDF document text
    • http://bike-aholic.com/UserFiles/file/55810773646.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/4ab04d70f76e12bbf13b6c8aaf00c343/7895642783.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090967c9b00a---jegafodesutowosesivabari.pdfIn PDF document text
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/q1m8egeafm9j8f20t1futj08bl/26206297510.pdfIn PDF document text
    • http://unternehmensberatung-hegenbarth.de/userfiles/file/42580007668.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/t22dq6h5cev91pte77a70nr1bp/navevutupakave.pdfIn PDF document text
    • http://teormech.ru/teormech/usrimg/file/lapupaboda.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=quotes+on+love+inspirationPDF 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_off00011114.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11114 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012926.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12926 17148 bytes
SHA-256: 0512908d38bab144f933d4ad931de0c215b1f100622b2830e0402588553efb3a
font_02_sfnt_off000155d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x155D7 10468 bytes
SHA-256: eab42318d2070110842ae5adeb7eabbb508b50aa72ecbe046877a91786d070da

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