Malicious PDF — malware analysis report

Static analysis result for SHA-256 88191bb9ac4a8f7b…

MALICIOUS

PDF

83.9 KB Created: 2021-09-16 10:48:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ca744e6350f6055ee0a6572b32e940ca SHA-1: 41f5a529417ad88aedb4df0b7a69958f0052e54f SHA-256: 88191bb9ac4a8f7becedf7b23bc1d89d38ff737e557f696a6395c2cee6ef1ec1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised CMS upload storage and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads or redirect to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://irlanc.ru/uplcv?utm_term=android+gaming+news PDF link annotation
    • https://ifbscalidad.eus/files/galeria/files/zaduzekef.pdfIn PDF document text
    • https://billard-hauri.ch/userfiles/file/xetekagobabi.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/161426498ccfeb---dinorugiwuvapibidesipej.pdfIn PDF document text
    • http://uniradioweb.info/userfiles/file/43437898869.pdfIn PDF document text
    • https://widerbet.pl/userfiles/file/4203799128.pdfIn PDF document text
    • http://393citizen.com/upload/files/46077528460.pdfIn PDF document text
    • https://imagebuzz.net/ckfinder/userfiles/files/zojizujupok.pdfIn PDF document text
    • http://yonezawanet.jp/units/24250/zcycom/files/64212564994.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/161421a6a240e7---65323982507.pdfIn PDF document text
    • http://vibestedu.com/_UploadFile/Images/file/budasapijomelarokil.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/f6a05e862f6417a95c62b5209a82c54f/36495236533.pdfIn PDF document text
    • http://www.kizkulesikizogrenciyurdu.com/public/ckfinderuploads/files/zufaxizosorezijel.pdfIn PDF document text
    • http://musicincw.com/fckeditor/userfiles/image/vatufinit.pdfIn PDF document text
    • http://thewhitmerlawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/viwusavusefakusitida.pdfIn PDF document text
    • https://chv.vn/userfiles/file/28581855225.pdfIn PDF document text
    • http://warwick-ems.org/userfiles/file/69676739227.pdfIn PDF document text
    • http://mexxeopaint.com/upload/files/nevowaresogaxi.pdfIn PDF document text
    • https://yodishit.com/uploads/userfiles/file/sobedojaxen.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/798b629f11fce5dad37286145cd83d68/palogisemesegu.pdfIn PDF document text
    • http://sten.kr/club/data/userfiles/file/20210914112731.pdfIn PDF document text
    • http://ooexperience.be/assets/Image/files/77025607254.pdfIn PDF document text
    • http://alltimescare.com/attachment/files/nidutitutuwivotafi.pdfIn PDF document text
    • https://birutelorasin.com/contents/files/65058454356.pdfIn PDF document text
    • http://kfoodntea.com/dataroom/file/zefasevakip.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_off0000e50d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE50D 17688 bytes
SHA-256: 4656e2dd01cb975534c9895337c7ac11f3e8b8dfc1b6424e20987119b05a304f
font_01_sfnt_off000112cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012ae2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AE2 10516 bytes
SHA-256: be4809b936990b53a5bff79be1c696ce4a766ab7184a548f86aa85360149002e

Open this report in the interactive analyzer, or submit your own file for analysis.