Malicious PDF — malware analysis report

Static analysis result for SHA-256 389a63bd0873ce17…

MALICIOUS

PDF

76.2 KB Created: 2021-06-29 19:23:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 3cec63dd1bf7ac0a9d407072fb74ec14 SHA-1: 505ab1cda482e451c885f0f487cae312d094b476 SHA-256: 389a63bd0873ce17d366f8445216f67df39831452bfa25f4703e35575161a5c9
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous compromised WordPress upload directories and other disposable hosting sites, indicating a phishing or SEO manipulation attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to delivering further malicious content or redirecting users to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://hillsdalehorseboarding.com/ckfinder/userfiles/files/jedamumiw.pdf In PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/3c65e7db0095ef81356dd8b50235ecd8/18225551495.pdfIn PDF document text
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/xigulorevigoduminuma.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8fb72e8236---65043618285.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077883c5ab1b---29847678470.pdfIn PDF document text
    • http://paulsaperstein.com/userfiles/files/23694136921.pdfIn PDF document text
    • http://yorktownhs1987.com/clients/57482/File/86926336786.pdfIn PDF document text
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071a6feb2860---zivixakevowom.pdfIn PDF document text
    • http://vtdsbinhthuan.vn/public/uploads/userfiles/file/wadipevifisidixu.pdfIn PDF document text
    • http://asfalon.com/__files/file/xovik.pdfIn PDF document text
    • http://bularz-auto.pl/images/userfiles/file/55383800072.pdfIn PDF document text
    • http://shsuorui.com/uploadfiles/fckeditor/20210612/file/16234841024019.pdfIn PDF document text
    • https://cuacuonbentre.com/upload/files/67805873656.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/b5a48k6gppbe7sbq8adu3tqq5h/ruxuremaxabelol.pdfIn PDF document text
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/3a00185cca1ab0e4f9b2bb8adbd08585/wirirogijesaxeluteg.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/pg69t2evc42ub8nm0j0n0tbri0/sujivegag.pdfIn PDF document text
    • http://xn--80aaae7amexjfdlfdfg.xn--p1ai/files/file/59464533026.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/156looh72lcnfo4e510rkn8ol8/kafin.pdfIn PDF document text
    • https://ihotel2b.com/upfiles/editor/files/96371428805.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160daa03cdec1f---wodexovedetuliserelud.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607de28fe995d---bemovedexarijune.pdfIn PDF document text
    • http://4bx.pl/public/file/11144773124.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/j28s9st17j6uj9qbga5kv4pdo0/21955951188.pdfIn PDF document text
    • https://www.ideaklinikankara.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607833bd8245d---49786450339.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=g30s+air+mouse+manualPDF 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_off0000bdba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDBA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d5d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5D1 10604 bytes
SHA-256: b0c7c3540f93421f6b0f0af720bce1f39090d0817d81728ef2acdc0eb8c7f040
font_02_sfnt_off0000ee02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE02 21168 bytes
SHA-256: 676c529992dac76e2ce6885c963ec416e5c526defe179c0f52a9b98103a17855