Malicious PDF — malware analysis report

Static analysis result for SHA-256 914af8b7c1747ab5…

MALICIOUS

PDF

90.1 KB Created: 2021-09-11 13:52:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2365db8de6ce9e085bc8acd056c8c72e SHA-1: 57882b10a4f927e4f3ed7a89abe2ef38b96a61d4 SHA-256: 914af8b7c1747ab54794d9843f906351f72272b62b744ac4756070cd7f1af2b7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious document, potentially leveraging embedded JavaScript for further actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://huntic.ru/uplcv?utm_term=oyasumi+punpun+volume+1+pdf PDF link annotation
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/161392b6aac0e6---58198011757.pdfIn PDF document text
    • http://ecosdaliberdade.com/ckfinder/userfiles/files/xiwudijetemeku.pdfIn PDF document text
    • http://giaydantuongphongngudep.com/images/news/file/5178056463.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16130f897e2c9d---limunevalofebu.pdfIn PDF document text
    • http://sherwoodchambergolf.org/ckfinder/userfiles/files/62522145702.pdfIn PDF document text
    • http://xedaptheduc.net/app/webroot/uploads/files/35754946448.pdfIn PDF document text
    • http://robedecreateur.com/img/files/bawajeverosinuma.pdfIn PDF document text
    • https://stotex.rs/files/zagegabugobexopakivibex.pdfIn PDF document text
    • https://edu-mate.kr/_UploadFile/Images/file/29095252174.pdfIn PDF document text
    • http://karinameal.com/imgdish/files/lesazimilutixu.pdfIn PDF document text
    • https://baobiachau.com/luutru/files/nevajesesanakumajax.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/medukexikolude.pdfIn PDF document text
    • https://knoxvilleremembers.com/media/87486438880.pdfIn PDF document text
    • http://toptoptraining.ru/img/upload/file/denafuraxomusi.pdfIn PDF document text
    • https://kmkmekanik.com/upload/ckfinder/files/milesite.pdfIn PDF document text
    • http://kythuatviet.vn/uploads/userfiles/file/42629219337.pdfIn PDF document text
    • http://huthamcauquanggiap.com/upload/files/24234176454.pdfIn PDF document text
    • http://wienbildarchiv.com/upload_files/files/25223853034.pdfIn PDF document text
    • http://songhakbbq.com/uploads/files/17376034323.pdfIn PDF document text
    • https://vico-real-estate.com/ckfinder/userfiles/files/49519809298.pdfIn PDF document text
    • https://megashina24.ru/files/files/58585990293.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613ba4f70140e---motusudinugal.pdfIn PDF document text
    • http://xn--3e0b556bhrbowi6undva.com/ckupload/files/kigikofufakabisagadegu.pdfIn PDF document text
    • http://www.og2c.com/images/file/fagarija.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a806f42df2---16151300940.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_off0000f10a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF10A 21480 bytes
SHA-256: a71ad57c011d5b7b1b3add56b7630022d752fdf864306d2190b0701fe5f54f77
font_01_sfnt_off00012957.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12957 10820 bytes
SHA-256: b782de1edd9a6013a7f39c38134db4937f76199c4d7279d153832fa0ff17b3e9
font_02_sfnt_off0001425e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1425E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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