Malicious PDF — malware analysis report

Static analysis result for SHA-256 8de9657442a2acd4…

MALICIOUS

PDF

81.4 KB Created: 2021-09-18 14:02:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 882b51c820a249102426b899b90371f5 SHA-1: ee47e1ee9ea88c858e6e5d55afbf656f4722fe0c SHA-256: 8de9657442a2acd4c04e3de4904db8d5481b94c38f0d1a09fa8451c3b2d0cfa2
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to external PDF files hosted on compromised WordPress sites and disposable domains, indicating a link farm designed to obscure the final malicious destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure of the PDF and its embedded links are indicative of a multi-stage attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • 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://szintai.hu/ckfinder/userfiles/files/99256935896.pdf In PDF document text
    • https://chilegastronomia.cl/uploads/userfiles/files/kefowulonitosikama.pdfIn PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/42c8335aa508efcbaa319afa263ef829/82302278550.pdfIn PDF document text
    • http://lucidarepavimentimarmogenovaealessandria.it/userfiles/files/guwimuzeporegal.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/rowomutakuv.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/6057965c8103cdfdb9f6738d54e00520/72543735506.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161400f60da2e8---35891811039.pdfIn PDF document text
    • http://lamardaegu.com/upfile/user/file/majiluzibido.pdfIn PDF document text
    • http://booklandbooks.com/userfiles/file/54776486258.pdfIn PDF document text
    • https://pirkitpadangas.lt/ckfinder/userfiles/files/wenajiviradexepaneporuju.pdfIn PDF document text
    • http://nawoo.net/userData/board/file/gamupew.pdfIn PDF document text
    • https://slotpt2.com/contents/files/tajokuliterufoge.pdfIn PDF document text
    • https://www.tahitotfalu.hu/ckfinder/userfiles/files/18679069163.pdfIn PDF document text
    • https://bazab.ru/ckfinder/userfiles/files/90598355992.pdfIn PDF document text
    • https://www.stnedu.com/ckfinder/upload/files/pabifusokirena.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f3398c42af---50908865865.pdfIn PDF document text
    • http://jdjcnc.com/upfolder/e/files/20210905003207.pdfIn PDF document text
    • https://madhubanindiancuisine.com/nbloom/fckuploads/file/60459165132.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/eb1048619df38f7e694bad191829c7ec/29996809010.pdfIn PDF document text
    • http://etkindenetim.com/resimler/files/xufotele.pdfIn PDF document text
    • http://farashimirooz.com/files/2287113866.pdfIn PDF document text
    • https://lawyerupsmart.com/tempimg/file/9235195229.pdfIn PDF document text
    • https://gs-hemeringen.de/ablage/userfiles/files/86505566063.pdfIn PDF document text
    • http://gerastar.com/userfiles/file/fukobe.pdfIn PDF document text
    • http://kasargod.net/uploads/file/92474399524.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=showtimes+for+a+quiet+place+2PDF 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_off0000d7c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000efdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFDD 11168 bytes
SHA-256: 8a0dc609ba7e28f1cb5fb1fdfe695ea6da234902776343a68ef63e3bbca0449b
font_02_sfnt_off00010a17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A17 17600 bytes
SHA-256: d9372b4e99f78501594a54d378d6b5bf99d434b6b022a1f313d7ff5adc47ee09

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