Malicious PDF — malware analysis report

Static analysis result for SHA-256 db0f90b3ceab6b95…

MALICIOUS

PDF

83.0 KB Created: 2021-09-20 15:55:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d046cf9bef759f8a418662850676d715 SHA-1: 268706d40f76d8e6b2ce660c85ff75ff426c380c SHA-256: db0f90b3ceab6b95e4c610925835f55ecb9b76db57b63e9105f46f09ec20cc8a
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, indicating a link farm designed to host malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/6eg0958bbk322it0fbig3s2fku/82968948070.pdf In PDF document text
    • https://ddc-touggourt.dz/ar/files/45348534295.pdfIn PDF document text
    • http://prograsifkalip.com/files/peponifazexaxaworajuwig.pdfIn PDF document text
    • http://basar-hemeringen.de/ablage/userfiles/files/75259341822.pdfIn PDF document text
    • http://dakov.hu/_user/file/96676773830.pdfIn PDF document text
    • http://roomyab.ir/basefile/roomyabir/files/8581084619.pdfIn PDF document text
    • https://zhansq.cn/upload/file/gemabukovopimivawa.pdfIn PDF document text
    • https://gentrilieu.vn/userfiles/file/dedulepipotariz.pdfIn PDF document text
    • http://lactopad.com/uploads/files/8575108771.pdfIn PDF document text
    • http://miryangpension.com/FileData/ckfinder/files/20210906_CC8CEE168365BAD8.pdfIn PDF document text
    • http://law885995.com/upload/fckimages/file/24417863493.pdfIn PDF document text
    • http://batiment-tunisie.com/userfiles/file/puwafipotozapalewaz.pdfIn PDF document text
    • http://foxadv.net/file/8656651109.pdfIn PDF document text
    • https://vegas-shop.net/uploads/files/pupiguradas.pdfIn PDF document text
    • https://livres-arts.com/ckfinder/userfiles/files/jexegej.pdfIn PDF document text
    • https://hanurichurch.org/ckfinder/userfiles/files/lijupujav.pdfIn PDF document text
    • http://alessandrobelleseveterinario.eu/userfiles/files/zaxepovulabaxobuwutaf.pdfIn PDF document text
    • http://istanbulballoons.com/ckfinder/userfiles/files/57015021308.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16136a1cf688db---vikixibedap.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16137bc2f23294---rowivonufemik.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139523a06cb8---lesuxeg.pdfIn PDF document text
    • http://muzeumostrowiec.pl/obrazy/file/fizodib.pdfIn PDF document text
    • http://geometrabottero.it/userfiles/files/32866801052.pdfIn PDF document text
    • http://indcms.testingmachines.com/images/file/20358203348.pdfIn PDF document text
    • http://morethancars.nl/uploads/edytor/file/momidid.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=adb+firmware+updatePDF link annotation
    • https://lapdonline.org/file/41025576460.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_off0000e12c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE12C 10528 bytes
SHA-256: 618c16d3daacca5c6139f8fa5adfca0a3e4b8f7c9f0122a46d78d94fb5da25b7
font_01_sfnt_off0000f8ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8FF 17588 bytes
SHA-256: 7569f698896e331831cbfdc6ae6322792d9f188eeeb47d0c34bcd64440dd7ff9
font_02_sfnt_off00012653.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12653 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1