Malicious PDF — malware analysis report

Static analysis result for SHA-256 53a1637625c52cd9…

MALICIOUS

PDF

99.8 KB Created: 2021-08-20 20:17:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8d7bd4e35ab34b29275f92d72df6273d SHA-1: d99541904a796a52af342633dd5d93fbbb21960e SHA-256: 53a1637625c52cd9d45ed5bb57b6af21eca7bdf10cff6483d5c5d850dcd5ecad
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites and link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious campaign, likely aiming to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9875

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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 http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608b040103c97---merakawujanis.pdf In PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/clfsnd5lesvrpf642tb6r1f6s4/dazeliveletoxifak.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/mcca8je1lvn8k1m6de2gnktr1d/87699858275.pdfIn PDF document text
    • http://iltorg.ru/upload/file/memaluwiviloloz.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/8934721083.pdfIn PDF document text
    • https://bd-sokolovska.eu/userfiles/file/mojirozuvedomibap.pdfIn PDF document text
    • http://cautrucpalang.vn/webroot/img/files/56424041725.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/ekkat78khv1r3jldr8q8s8b1d7/73066741299.pdfIn PDF document text
    • https://actorconseil.com/files/file/siwikidofavalepofup.pdfIn PDF document text
    • http://www.barbazan-debat.fr/ckfinder/userfiles/files/16670341852.pdfIn PDF document text
    • http://leasingtowers.com/ckfinder/userfiles/files/xarawebomubefosazada.pdfIn PDF document text
    • https://farmacieitaliane.com/documenti/file/povufukavugesumo.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160ab112344b5f---nesejasowozijudubef.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/98e5e725a840c8c33de686f9ca2603ff/sujat.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/436b51c3ca668e1218a9ea4af081a670/patesebinun.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/dc56d66ee06a7a0c13999fa5e12ca4f8/31817270067.pdfIn PDF document text
    • http://kowalstwwo.pl/public/cms//images/file/verovup.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/dblhfe9dnp03md8n1slloufq33/katolewewipubudi.pdfIn PDF document text
    • https://majubesar.org/contents//files/pulilosokuvineruwepuk.pdfIn PDF document text
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083acddbf77c---10625699995.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1608c46b772776---86924785867.pdfIn PDF document text
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/fe7b55a6200802d82fb0a23b3b81cbb5/vopopufepovuxawesenaxire.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/88592530189.pdfIn PDF document text
    • http://raczcsalad.hu/files/48816428554.pdfIn PDF document text
    • http://chayka-svg.ru/files/xunomenilatefewujemenoma.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073d4779210f---64291969704.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=ingles+gramatica+facil+vaughan+pdf+descargarPDF 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_off00011b3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B3B 19828 bytes
SHA-256: bbbf36f00b84799d8de19df9f1f8e821b335a432704eb0d34c71cc47a6aeda1d
font_01_sfnt_off00014df3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DF3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001660a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1660A 11064 bytes
SHA-256: 4d9287f4fecb3040267c4e75a377971ed9e1739e19ccd8f4c2bd354fa9b04cef

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