Malicious PDF — malware analysis report

Static analysis result for SHA-256 5039c1002d59c215…

MALICIOUS

PDF

92.6 KB Created: 2021-09-01 23:57:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 269cb05582e4f185a3ccc4173789af13 SHA-1: 1f37a1bffbbf843230f3e7bffb056bb80dcd9697 SHA-256: 5039c1002d59c2152ee1f96e110cef77f321c1c497c7d2d7e773d881fdbb9715
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple embedded URLs disguised as download links for a book, likely to trick users into visiting malicious websites for phishing or malware delivery. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing or downloader attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://crysiq.ru/uplcv?utm_term=a+young+people%27s+history+of+the+united+states+pdf+download PDF link annotation
    • http://xn--80ahcjevtqq.xn--p1ai/ckfinder/userfiles/files/18137449793.pdfIn PDF document text
    • http://melvin.cz/data/4509659326.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/4cd43e24d520aac1b25db9355429e25e/zebizex.pdfIn PDF document text
    • https://atcotourismtravel.com/userfiles/file/35056732939.pdfIn PDF document text
    • https://intrigantka.ru/images/userfiles/file/xesowevowaxatofotujeguka.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16091348bc7f15---xunosemed.pdfIn PDF document text
    • https://sluganarodu.org/userfiles/files/66117849355.pdfIn PDF document text
    • http://aaaexpressac.com/userfiles/file/16341194556.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/bemunufuju.pdfIn PDF document text
    • https://panegovernance.com/ourprojects/chowki/UserFiles/file/25978150764.pdfIn PDF document text
    • http://kondicionery-krasnogorsk.ru/upload_picture/file/savapefifevovu.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094d9e136003---31996037700.pdfIn PDF document text
    • https://drsaman.com/files/pobomekovumomapi.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/1609b79d73b5c1---nagifomobu.pdfIn PDF document text
    • http://benthanhsgfarm.net/images/uploads/files/13230400798.pdfIn PDF document text
    • https://bywuf.org/upload/editor/files/78594492786.pdfIn PDF document text
    • https://panama4d.com/contents/files/jutoguselu.pdfIn PDF document text
    • http://ggbris.com/slbdavbatala/userfiles/file/nifoje.pdfIn PDF document text
    • https://bharatiyabhashaparishad.org/ckfinder/userfiles/files/desefexujimurejom.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607786bd870a9---vikedesepofem.pdfIn PDF document text
    • http://tangiahoang.com/skinkorea/Images_upload/files/gaworinikezurelisibes.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/knc7ml122ned9cgrge8cllku20/12257808743.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/iq1fkdrb4l9tkeerjnc05g5377/nemuzisivekubuwazifag.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_off000102b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102B8 18272 bytes
SHA-256: 3c8be0fc87a8d7213501966d3e5c57f061628adf337c3759a3178b1f538b54c0
font_01_sfnt_off0001327c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1327C 11092 bytes
SHA-256: 3237524cbb89e77a5ae44671f14c6dc1f87145dc90e0328953b8ae7a9fac6e8d
font_02_sfnt_off00014c43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C43 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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