Malicious PDF — malware analysis report

Static analysis result for SHA-256 89774e5a3bdcaea4…

MALICIOUS

PDF

105.0 KB Created: 2021-10-05 04:33:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e6340fb0d585f158864e7c1eebc29738 SHA-1: f752ac9b957ee6b0a3e497e36ad36fc903d7b3ae SHA-256: 89774e5a3bdcaea4d24f6087615ab4662cdcab620dfc286226b2fe47dfb0df53
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS uploads or disposable domains, suggesting a phishing or malware distribution scheme. The ClamAV detection and ML classifier strongly indicate malicious intent, likely involving exploitation of PDF vulnerabilities to redirect users. No scripts were extracted, but the overall structure and URL patterns are consistent with a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9877

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 https://drafthe.ru/uplcv?utm_term=immunotherapy+for+melanoma+cost PDF link annotation
    • http://vasekurzy.cz/userfiles/file/lutunugolisafuxajot.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612eca7b659bd---fabumuza.pdfIn PDF document text
    • http://oipipleszno.pl/userfiles/file/75901304898.pdfIn PDF document text
    • http://evohome.pl/userfiles/file/tomupivupigide.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/cbiuujegnf83hvp60a4018cq01/derodemenutitiwanalotuzi.pdfIn PDF document text
    • http://gianphoiduyloimodel.com/Images_upload/files/luxutisevuxopolusu.pdfIn PDF document text
    • https://www.mediawerf.nl/bundles/store24backoffice/ckfinder/userfiles/files/22217595382.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/27841142491.pdfIn PDF document text
    • https://badanie-wody.pl/galeria/file/fiwatigigadudijeno.pdfIn PDF document text
    • http://otoozevran.com/resimler/files/83473315218.pdfIn PDF document text
    • http://xn----7sbndn5at.xn--p1ai/uploads/files/daxaxufabazefomivafijagow.pdfIn PDF document text
    • http://express-service-auto.fr/ckeditor/ckfinder/userfiles/files/61752877017.pdfIn PDF document text
    • http://hanstime.com/userData/board/file/zonadilux.pdfIn PDF document text
    • http://cartopack.com/Images/file/dosovaxa.pdfIn PDF document text
    • http://cuuhoatudong.com/upload/files/vejiriserarubovugo.pdfIn PDF document text
    • http://kimsanghun.com/upload/userfiles/file/20219201712176414.pdfIn PDF document text
    • https://www.casestilistas.es/ckfinder/userfiles/files/65757015447.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d43f5ee314---72214468440.pdfIn PDF document text
    • http://krajinar.cz/soubory/files/dewovomajedibokubarojez.pdfIn PDF document text
    • http://bowie.abwingsmd.com/uploads/files/68258017104.pdfIn PDF document text
    • https://miaousland.fr/ckfinder/userfiles/files/72576448100.pdfIn PDF document text
    • https://pharma-tools.eu/galeria/file/roluf.pdfIn PDF document text
    • http://cofetariafraguta.ro/UserFiles/file/fabavofum.pdfIn PDF document text
    • http://alcantara.cz/data/file/pexodutogota.pdfIn PDF document text
    • https://regaluxiluminacion.com/uploads/assets/file/pizefetanexiv.pdfIn PDF document text
    • http://dajuicebarus.com/uploads/files/46930529229.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_off00012ef1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EF1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00014708.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14708 10820 bytes
SHA-256: b3f41a201cf2e83028831d42e75ec155e3b9408624146f6a23dd412da2c3d9e6
font_02_sfnt_off00015fdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15FDB 21036 bytes
SHA-256: 594bc3369432e5645922e0ddab3e2cee1660c962c099e8e9ecc910a715d1dcbc