Malicious PDF — malware analysis report

Static analysis result for SHA-256 edf539908078d0d1…

MALICIOUS

PDF

97.5 KB Created: 2021-07-15 20:59:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: fffdbf5f6a8af28b25903b0abed73a8d SHA-1: b97c16720ecfb1925ff35797dacb7cb0597780d1 SHA-256: edf539908078d0d15b7132b8ab4762a8067f1119f6c3d1e96b83b12b1438f48b
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to websites that appear to be compromised CMS uploads, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, and the document body was unreadable, but the heuristic findings are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/l8veuv67jqgt2uq9a66bou42k0/22221688787.pdf In PDF document text
    • http://svsteinfurth.de/radsportfiles/file/neluxirizeger.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b41e9aa20c6---kibazigeri.pdfIn PDF document text
    • http://orhs89reunion.com/clients/77823/File/99413039724.pdfIn PDF document text
    • http://mega-stainlesssteel.com/uploads/image/files/pevaf.pdfIn PDF document text
    • http://phayaotechno.com/UserFiles/File/gumevevoximegozobazimu.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16079a8061c743---5086872962.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606eeebe2fd01---xaxenilolaferotexonulaw.pdfIn PDF document text
    • http://terralindahigh1981.com/clients/866868/File/xagokuduboruluki.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078d72625d91---kereboj.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c567e1bd3a3---80499619767.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b8f63d7b6fd---batikefevajiviwadizaluxi.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/16775191468.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/dab7e6703230cb41a6b9505be8aeb028/bomogeb.pdfIn PDF document text
    • http://nhakhoasaigonkimcuong.com/uploads/images/files/63757633988.pdfIn PDF document text
    • http://ridgefieldpark1967.com/clients/3/39/39eebdc8797e30ee23d4fd57d071fd44/File/xuferunezatozub.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092d42ba6419---wugilosaraferologane.pdfIn PDF document text
    • http://woodsfamilypride.org/clients/2/2c/2c83419adcf4927d74d3defe18342386/File/45098060554.pdfIn PDF document text
    • http://porpora.info/imagenes/imagenes_contenidos///18274241799.pdfIn PDF document text
    • http://plafondchauffant.fr//img/user/file/51950371480.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc63de7337---61727431188.pdfIn PDF document text
    • http://healingpawswisconsin.org/clients/a/a9/a991db820639e3552774ed9a746c1e3b/File/raruwoti.pdfIn PDF document text
    • http://gdgom.com/upload/file/210615020113309136g0ngsg33lc12.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7b8b56974---bokirilifusutafufa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=swf+embroidery+machine+troubleshootingPDF 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_off00011728.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11728 17952 bytes
SHA-256: f71e8a1d217117c2cccd2c9cd6f6eafe67d5daf4ffd3c33e6cc3d1bcf754c110
font_01_sfnt_off000145dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015df4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15DF4 11440 bytes
SHA-256: c14b7f495c8696c320936c4b4b8305bab17639d2ede54dde5daa978cf3ad4611