Malicious PDF — malware analysis report

Static analysis result for SHA-256 67e39187b79e5f01…

MALICIOUS

PDF

72.2 KB Created: 2021-09-16 06:06:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: dc02f607a2920c41289a9cdc5a8e5656 SHA-1: 5926a57758b32f7c52f13bdc92c1a55ea9325a5b SHA-256: 67e39187b79e5f0105e511ec210b5575bbb4c52d6d4233c3c3c78ec93fb44e51
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. The presence of external URIs and compromised CMS upload links further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://crewmak.ru/uplcv?utm_term=unlabelled+diagram+of+the+digestive+system PDF link annotation
    • http://keramann.ru/uploads/files/41803656512.pdfIn PDF document text
    • http://kovove-ploty-brany-zabradli.cz/UserFiles/File/tovonixuwogudawas.pdfIn PDF document text
    • https://feltshoe.com/userfiles/file/dezasasimofapumi.pdfIn PDF document text
    • http://tw-tms.com/uploadpic/xw/files/32419489607.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137fab27ee8d---bepibugifetupek.pdfIn PDF document text
    • http://guitarenko.fr/img/files/kuvegexijebapodi.pdfIn PDF document text
    • http://nigerseedindia.com/uploads/jazawaduxirifi.pdfIn PDF document text
    • http://globalbizkorea.com/userData/board/file/wavose.pdfIn PDF document text
    • http://karaokejdi.com/ckfinder/core/connector/php/upload/files/ragebi.pdfIn PDF document text
    • http://shipagents.nl/uploadfiles/file/65572926393.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/16132ca808b127---mupidirix.pdfIn PDF document text
    • http://foodchemsino.com/d/files/paxize.pdfIn PDF document text
    • https://cashcruis.ru/wp-content/plugins/super-forms/uploads/php/files/4561fd6399006c77b527104c3e7f1d9b/73726175641.pdfIn PDF document text
    • https://ajur.rest/uploads/userfiles/file/faxepedelev.pdfIn PDF document text
    • http://primebrokeragetx.com/ckfinder/userfiles/files/fazexegikikodegab.pdfIn PDF document text
    • http://riviera.az/userfiles/file/duvop.pdfIn PDF document text
    • http://hflbdq.com/uploads/file/091052187112.pdfIn PDF document text
    • https://branchennachweis.eu/userfiles/file/77499264390.pdfIn PDF document text
    • http://sushibelovo.ru/files/27129315893.pdfIn PDF document text
    • https://panama4d.com/contents/files/18055291020.pdfIn PDF document text
    • http://gursakaryahukuk.com/images/file/73144185267.pdfIn PDF document text
    • https://kfk-dekoration.dk/images/uploadedimages/file/xemabideniso.pdfIn PDF document text
    • https://equinox-e.com/upload/files/70358681140.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_off0000b941.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB941 15800 bytes
SHA-256: e11e852c14da3ffcab0f96087c4d48cba4d013f12579b0e8ff7fce1a596d59e6
font_01_sfnt_off0000e1ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1CA 11128 bytes
SHA-256: cd141f2a8fc9f66e41fa8aa7404c961708022f32502a3446b7454c0f260f3d09
font_02_sfnt_off0000fb64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB64 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1