Malicious PDF — malware analysis report

Static analysis result for SHA-256 894dd66af7f8ca89…

MALICIOUS

PDF

79.9 KB Created: 2021-09-06 08:30:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: bc6d4533adb01f598158a3e138fba6c2 SHA-1: ab58d6983d4407b95a601ab607d370ffe5bfe7be SHA-256: 894dd66af7f8ca89eb644b4a362fb4f8984ca6b892790b1d35572e83d6fd8e95
156 Risk Score

Malware Insights

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

The file is a PDF containing numerous embedded URLs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate maliciousness. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic confirms the presence of a link farm on disposable hosting, suggesting an attempt to distribute malicious content or phish users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/c04a911d65f40ae6f1f333a90650929d/zazodimujazasiwire.pdf In PDF document text
    • http://lyzph.com/userfiles/file/Fl202108232026208111.pdfIn PDF document text
    • http://whatifitspossible.com/ckfinder/userfiles/files/bopefakuz.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c8b29194285---pijepogovebidisu.pdfIn PDF document text
    • http://xn--clinicaquirogavilario-vbc.com/wp-content/plugins/super-forms/uploads/php/files/p2vk0q0j79rn2pqbflpu2o6ga6/kabenakuvorawusapewiv.pdfIn PDF document text
    • http://jhferry.com/data/fckeditor/file///61784144621.pdfIn PDF document text
    • http://thcsducthang.pgdbactuliem.edu.vn/ckfinder/userfiles/files/45193683830.pdfIn PDF document text
    • https://dollarplus98.com/images/upload/files/puxepekatibumidijuvizir.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/53255489531.pdfIn PDF document text
    • http://sage-chem.com/image/files/20210604_131532.pdfIn PDF document text
    • http://osheamaloneynylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/ruwanogite.pdfIn PDF document text
    • http://taiwanglassgroup.cn/userfiles/file/83292771243.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/42436376045.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3629eb6d23---joxikozisifapo.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16076926bab679---53013092000.pdfIn PDF document text
    • http://kingalbertltd.com/uploadedfiles/file/nefezotopuxid.pdfIn PDF document text
    • https://uzmanwebci.com/calisma2/files/uploads/23647575440.pdfIn PDF document text
    • https://pianoinprimopianofestival.com/uploads/file/mezalesegifoliji.pdfIn PDF document text
    • https://tecnicadovolante.com/images/file/nefokerijudu.pdfIn PDF document text
    • https://dichvumayphoto.vn/webroot/img/files/21301379419.pdfIn PDF document text
    • https://aluminiosarla.com/userfiles_arla/files/30766665920.pdfIn PDF document text
    • http://nandishoverseas.com/UserFiles/File/tulosupilunizu.pdfIn PDF document text
    • http://fotocaroli.it/userfiles/files/47185867348.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aca20371e63---61226729993.pdfIn PDF document text
    • https://jnfarley.com/wp-content/plugins/super-forms/uploads/php/files/lbo3rrord7d68k1tb1t7n1c9u1/71076227224.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=hitler%27s+rise+to+power+timeline+worksheetPDF 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_off0000d561.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD561 10556 bytes
SHA-256: 6a1d3ccd8b5ebec670aaeb0e607dc8bfefc80de371917dd9fd9103a5f598c3cd
font_01_sfnt_off0000ed46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED46 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010558.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10558 17396 bytes
SHA-256: fc6c580679bce378b69eb4a2e8f51f07dcbfe344ec6bbc97034a2f299747a3b4