Malicious PDF — malware analysis report

Static analysis result for SHA-256 fba6547c54eb9e30…

MALICIOUS

PDF

92.4 KB Created: 2021-10-06 15:59:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: fa45a7d03969159ad0e06971a8e12fbb SHA-1: 5310d1a02b4648751277b5d673c6d7e6b426008a SHA-256: fba6547c54eb9e300512a8fe942dee3b308947882485a2d44692214c4a0519a7
196 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics, including a fake CAPTCHA prompt and links to compromised CMS uploads and disposable hosting. The ML classifier also strongly indicated maliciousness. The document's purpose appears to be a lure, likely for credential harvesting or to trick users into executing further malicious content via the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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://smidgel.ru/uplcv?utm_term=free+apex+coins+ps4+no+human+verification PDF link annotation
    • http://szpital-sulecin.pl/images/fckfiles/file/45555146412.pdfIn PDF document text
    • https://rijst.nu/userfiles/file/kijajenire.pdfIn PDF document text
    • https://cemb.ca/upload/editor/file/fesajinewulazaju.pdfIn PDF document text
    • https://dollarplus98.com/images/upload/files/gobepanizibop.pdfIn PDF document text
    • https://molecult.metallo-tests.ch/sites/web/upload/files/makadiwonezozulej.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614d7aa14957e---jifuk.pdfIn PDF document text
    • https://nezamirekhaseafoods.com/userfiles/file/suvekirodokogatimof.pdfIn PDF document text
    • https://tnmkor.com/FileData/ckfinder/files/20210913_A461A19351A0C47D.pdfIn PDF document text
    • https://www.scmsgroup.org/ckfinder/userfiles/files/zominemuzugamupisi.pdfIn PDF document text
    • https://coffotea.com/uploads/files/202109061045198485.pdfIn PDF document text
    • http://warwick-ems.org/userfiles/file/71334680139.pdfIn PDF document text
    • http://aytekinpolatel.com/image/files/87232395481.pdfIn PDF document text
    • http://ivelinabozilova.com/userfiles/file/44715936549.pdfIn PDF document text
    • https://www.tahitotfalu.hu/ckfinder/userfiles/files/91868723203.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/liu4hp2mk6kb75pej7djnvr537/24027576649.pdfIn PDF document text
    • http://mexvp.com/ckfinder/userfiles/files/fifemuridusugeripupejexo.pdfIn PDF document text
    • https://creativenursery.net/home/creative/public_html/ckfinder/userfiles/files/roluzolimojubukotovavof.pdfIn PDF document text
    • http://khautrangkhangviet.com/upload/img/files/1108520703.pdfIn PDF document text
    • http://studionegrelli.it/userfiles/files/sekexomodaw.pdfIn PDF document text
    • https://gagiongvitgiong.com/ckfinder/userfiles/files/99005662505.pdfIn PDF document text
    • https://www.funes.gob.ar/ckfinder/userfiles/files/49277500466.pdfIn PDF document text
    • http://mousike.it/img_ins/files/berigufujinususuranowa.pdfIn PDF document text
    • https://brakos.it/file/18352645294.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/161337ae53d1ac---rakuxorotebavazimema.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_off0000fedc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEDC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000116ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116EE 19468 bytes
SHA-256: fa38e597873288fda6518eae021d571982fba7a728647181fbbca33d5fb76083
font_02_sfnt_off00014a0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A0E 11024 bytes
SHA-256: 67178d381d3594d9761bcd888f145e4237f480b220519941957b289faa564134

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