Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf085c5916bbdc0a…

MALICIOUS

PDF

79.6 KB Created: 2021-09-19 15:31:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 27e6cfe3d6aaed4a563eadc9fb9dad7c SHA-1: bb9980960f2d7b07c1f5e7588b619985ae335cb0 SHA-256: bf085c5916bbdc0ac19e6ebe722173547a2f42de79ffe7b428478ed16bfe250e
196 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed for phishing or malware distribution. The heuristic 'SE_PAYMENT_REDIRECT_LURE' strongly suggests the document's content is designed to trick users into believing there are new or changed payment instructions, a common tactic in business email compromise attacks. ClamAV detection further confirms its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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://ketchas.ru/uplcv?utm_term=downloadable+keyboards+android PDF link annotation
    • https://kurashi-kyoiku.com/cms/dat/upimg/file/bufevatoriro.pdfIn PDF document text
    • http://kabaretyimpresariat.pl/Upload/file/64956243091.pdfIn PDF document text
    • http://lineshare.net/upload/files/20210911033609.pdfIn PDF document text
    • https://kp-bs.ru/upload/files/517083425.pdfIn PDF document text
    • http://bischofs-scheune.de/userfiles/file/lodimigesodebapurofid.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/e37cb8018746fc5c7e0f36bc2e43ee0d/16700182236.pdfIn PDF document text
    • http://zulassung4you.de/bilder/file/xitozagudele.pdfIn PDF document text
    • http://mistral-paints.cz/userfiles/files/vunagakix.pdfIn PDF document text
    • https://yourwebcenter.com/files/file/13034628029.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/40g99th3r2dqq2r64jrfpgtatc/veveveriru.pdfIn PDF document text
    • https://pchome.uzai.ca/upload/files/fofipalijoxarolizuvebadi.pdfIn PDF document text
    • http://cartonwrappingmachine.com/userfiles/file/84210517009.pdfIn PDF document text
    • http://tid.vn/upload/files/36686624789.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/renovixusositowux.pdfIn PDF document text
    • http://chieucoingason.vn/files/nometupajub.pdfIn PDF document text
    • http://prospekt-rostov.ru/ckfinder/userfiles/files/tamokusodubu.pdfIn PDF document text
    • http://teamtrinity.net/trinitya/file/pijijilaw.pdfIn PDF document text
    • https://ferado.vn/userfiles/file/detisumiz.pdfIn PDF document text
    • http://ebonit.light.bg/includes/libs/ckfinder/userfiles/files/39293980795.pdfIn PDF document text
    • http://kerama.altrodesign.eu/ckfinder/userfiles/files/vuzujijebijutikolunuk.pdfIn PDF document text
    • http://ticaproduce.com/ckfinder/userfiles/files/lufupimuwezaxopav.pdfIn PDF document text
    • https://shoppingplanet.ro/ckfinder/userfiles/files/79201114174.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144b357d703a---48437808076.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_off0000d231.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD231 10576 bytes
SHA-256: a529b90aaa73827c1ec36018b07821c053c9b839f09914d715fcf175a07984d0
font_01_sfnt_off0000ea7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA7B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001028d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1028D 18000 bytes
SHA-256: 3947200ce48331448ecbe7d73683f074fe2448431df6301210e2040b651b10f8

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