Malicious PDF — malware analysis report

Static analysis result for SHA-256 93fbc4e89eb8b6f6…

MALICIOUS

PDF

97.7 KB Created: 2021-09-07 10:11:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1e3c45c8ded12cd42c104f5fbd292d10 SHA-1: bbdd12695a26435a147af18ec7ffdcd903efeaeb SHA-256: 93fbc4e89eb8b6f6c95ce9404edbbaf5cfc8ef739e673d2520d53a37b3286b0e
164 Risk Score

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous links pointing to compromised or disposable hosting, suggesting a link farm designed to trick users into downloading further malicious content. The presence of a 'download button' heuristic further supports this phishing-like lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://gilbertems.com/videos/file/vuratago.pdf In PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160f1177b8caa6---rimiwemewaja.pdfIn PDF document text
    • http://dekoblickfang.de/userfiles/file/zenelaloretupi.pdfIn PDF document text
    • http://garmagostaran.com/Upload/file/97960867101.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/gm7ur7egcithbig4up612d2i5b/kuramowivi.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607e78db6a5c9---xopoduduratakugu.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160b53569a5ad7---45626744855.pdfIn PDF document text
    • http://myphamhelios.vn/luutru/files/bixajumolezilevemil.pdfIn PDF document text
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/2e7637cc563c6d8d444623b8424a7e9f/30533427083.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/8ccfc0d28081d5b62785b44737721595/pejajemifunujumalav.pdfIn PDF document text
    • https://pasarantogel.com/contents//files/33196220618.pdfIn PDF document text
    • http://hugslock.com/app/webroot/img/files/bafelogukusodevuraxinatep.pdfIn PDF document text
    • https://crownprolaw.cn/userfiles/Proj_Name//files/zevewoberokitoberiluwov.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160db5bc98c82f---vixib.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/r23d1tjmjlda4tr7c54lngj73v/39555141434.pdfIn PDF document text
    • http://apmnir.ro/fckfiles/file/gurinevimumulewibuzozovex.pdfIn PDF document text
    • http://labonguyenhoang.com/img-chamthi/files/12475476408.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dcc2c1ade1---42695039581.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607919704d98c---somebowejefuvatojuzexuzi.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/f7badec518ebe1eb43fe92d93bfb03f6/59137496340.pdfIn PDF document text
    • https://systematix.pl/userfiles/file/baxomajeninisapimurovi.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/16120f5c71ac02---fusawi.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1611cf051c1aec---nemajixibutibivagisete.pdfIn PDF document text
    • http://wphs69.com/clients/1/13/13dd0a1135c99f886ff4006aa3c820ba/File/46330592672.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=general+electric+medallion+stove+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_off0001184e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1184E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013060.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13060 18444 bytes
SHA-256: a3492fd21d0f1688d5f708a4efb67876f1f3c2c6175aa1e6835960f560991e51
font_02_sfnt_off000160c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x160C3 10736 bytes
SHA-256: 8939b67d8cae4e5a5ba76781ddc31606882443b0634c0a4bc2402d0e5471fccc

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