Malicious PDF — malware analysis report

Static analysis result for SHA-256 05872ba2328c6e75…

MALICIOUS

PDF

80.1 KB Created: 2021-09-08 20:21:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f82749f1dac93cb4b08e2ca6f4f3c420 SHA-1: 3f35278695309ddfbe8369e9514a0829fc3e83d3 SHA-256: 05872ba2328c6e757d4b88c7f02fc0ac2d48cf02a11af0e231dd2b58c5916821
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The PDF contains embedded JavaScript and a large number of external links, many of which point to compromised WordPress sites or disposable hosting, suggesting an attempt to redirect users to malicious or phishing content. The primary intent appears to be user deception through a link farm and potentially malicious JavaScript execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://queure.ru/uplcv?utm_term=mongolia+visa+application+form+pdf PDF link annotation
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/dbabe72f7143acf447cb915751d5eb97/15576273713.pdfIn PDF document text
    • http://yilip.net/userData/board/file/74216518562.pdfIn PDF document text
    • https://emailing-online.fr/uploads/userfiles/file/nakasinam.pdfIn PDF document text
    • http://tvoirostov.ru/ckfinder/userfiles/files/8278131527.pdfIn PDF document text
    • http://autavrabek.cz/obrazky/file/63163299235.pdfIn PDF document text
    • http://studiospazioambiente.it/userfiles/files/95219061440.pdfIn PDF document text
    • http://pribatu.lamilagrosaimport.com/images/files/rosirixivekujutewowot.pdfIn PDF document text
    • https://detector-billetes.com/Imagenes/file/noxop.pdfIn PDF document text
    • http://taketty.xyz/js/ckfinder/userfiles/files/39817770850.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/161302a2684cd3---midefame.pdfIn PDF document text
    • http://bc-arman.kz/ckfinder/userfiles/files/lojoranadawokiku.pdfIn PDF document text
    • https://speculatio.in/userfiles/file/rozelagejoluruledoroze.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/504c2c697a805c8d8c1336f9354f400d/bifakuf.pdfIn PDF document text
    • http://shanghaiqingchen.com/upload/files/pipaxekubimat.pdfIn PDF document text
    • http://teknis.it/userfiles/files/xevutete.pdfIn PDF document text
    • https://cowichanmusicfestival.com/userfiles/file/63755177338.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134abeaeecb7---52779643069.pdfIn PDF document text
    • http://vandientuchinhhang.com/upload/files/47248186851.pdfIn PDF document text
    • http://hoteldanang.com/uploads/images/files/60947939265.pdfIn PDF document text
    • https://sunriseinnjasper.com/nbloom/fckuploads/file/43443845597.pdfIn PDF document text
    • https://408of53crownstreet.com/assets/media/files/zirajisukaxosorusonusu.pdfIn PDF document text
    • http://deaprogettazioni.it/userfiles/files/56296271301.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/15bgejkm1dvh2k2l99mi7rco4j/32705508230.pdfIn PDF document text
    • https://kingwaterpure.com/ckfinder/userfiles/files/videz.pdfIn PDF document text
    • http://korealabels.com/ckfinder/userfiles/files/galarigaduti.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_off0000d319.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD319 18544 bytes
SHA-256: ce9804926efd6ad5608057bca515b98997cc20452433f492fd8688dc9a2b5673
font_01_sfnt_off00010215.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10215 10892 bytes
SHA-256: 2d812e94c8aa3b3d3fe778638effc01fd9e81ff9531e62fd0ecadf9233aa6707
font_02_sfnt_off00011b21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B21 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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