Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdd91e99a673c545…

MALICIOUS

PDF

81.6 KB Created: 2021-09-08 19:29:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8cbad0151bf8306b3e12909a774d60bf SHA-1: 5122ce70cb010112cd61ab43d0102801651aa8d1 SHA-256: fdd91e99a673c545634a467332a19348a8cadfb90f570e107363ffc578d50ada
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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 http://cameragiaminh.com/upload/files/nodadabopano.pdf In PDF document text
    • https://mamo-tato.ro/userfiles/file/86801157173.pdfIn PDF document text
    • http://ogledalata.bg/uploads/pages/files/27444957979.pdfIn PDF document text
    • http://hotdeals24x7.com/ci/userfiles/files/99333841895.pdfIn PDF document text
    • http://nissanotogovap.net/uploads/images/files/worexatofizizeliwuzudab.pdfIn PDF document text
    • https://majubesar.org/contents/files/87658457523.pdfIn PDF document text
    • https://livnica-metalurg.com/images/pages/file/93990759928.pdfIn PDF document text
    • https://coffeetuanvang.com/Images_upload/files/11505099015.pdfIn PDF document text
    • http://traiteur-ribot.fr/userfiles/file/86916789967.pdfIn PDF document text
    • http://sedaciesupravy.sk/media/file/67801436092.pdfIn PDF document text
    • http://chelseafoodmart.com/uploads/files/rutiraros.pdfIn PDF document text
    • http://www.oiseaubleu-promo.fr/userfiles/file/luvatupenedojuzulazuzax.pdfIn PDF document text
    • https://gkia.org/kingkong/userfiles/files/60138914338.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161334f1d6db2d---10871448435.pdfIn PDF document text
    • http://susasoft.com/upload/userfiles/files/54752200626.pdfIn PDF document text
    • https://sunnyvale.com/wysiwygfiles/file/luwosezibewujutadenadovu.pdfIn PDF document text
    • http://zdravi-kromeriz.cz/files/file/58948440714.pdfIn PDF document text
    • http://cpghollywood.com/userfiles/files/43476476458.pdfIn PDF document text
    • http://fuhua.tumujike.com/assets/upload/files/202109040728158183.pdfIn PDF document text
    • https://msiutilities.net/documents/54364603549.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16136b782150fb---94152194991.pdfIn PDF document text
    • http://nakajima-ya.com/upload/save_image/files/pazesidorixeza.pdfIn PDF document text
    • http://makinsushi.com/uploads/files/gapuxurida.pdfIn PDF document text
    • http://anoh.net/pds/userfiles/files/gudasevodefaguvuj.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/161387ade21555---xeromobaka.pdfIn PDF document text
    • https://maturana.cl/upload/file/neranazewugipivawupo.pdfIn PDF document text
    • http://suachuaspa.com/upload/images-content/files/pajodabazugubijuziru.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=mr+loveday%27s+little+outing+evelyn+waugh+pdfPDF 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_off0000d8b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8B6 17632 bytes
SHA-256: 559f6ac729fa7a8d2a37ea5090eb74c7c70614497192985e176b341dc389e377
font_01_sfnt_off00010612.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10612 11172 bytes
SHA-256: d51ad397de3b056d6dee3411abfabda3c8f621342efa268444c30b624a1200e6
font_02_sfnt_off0001200b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1200B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1