Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9c8738c8f087952…

MALICIOUS

PDF

90.7 KB Created: 2021-09-18 07:36:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c2508ddaa7c03c7c1233d058d12e8df4 SHA-1: 047cd645758d7a8cb27189f5367871e88ed27e8a SHA-256: d9c8738c8f0879523117bc29886704e4d6e4ba2dfbf76aab39800b6259b9a71e
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised CMS upload storage or are part of a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or directing users to malicious content. No scripts were extracted, and the document body was unreadable, limiting further analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9702

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 http://31kouqiang.com/userfiles/file/1631614063.pdf In PDF document text
    • http://mikailang.com/userfiles/file/20210906144834_612887411.pdfIn PDF document text
    • http://sieuthihatgiong.vn/webroot/img/files/86264366096.pdfIn PDF document text
    • http://greenhere.cn/upload/ckimg/files/202109180807298378.pdfIn PDF document text
    • http://mh-gartengestaltung.de/userfiles/file/64173346332.pdfIn PDF document text
    • https://photojet.bg/userfiles/file/dotudukufizezupolejisotix.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/161431c99b4320---bifisodanakufedokiz.pdfIn PDF document text
    • https://lanegarrett.net/userfiles/file/24613695693.pdfIn PDF document text
    • http://chemicalengineers.ie/images/juzogefoxizuxi.pdfIn PDF document text
    • https://maconlux.lu/userfiles/files/nodukavulizuwibez.pdfIn PDF document text
    • http://cristal-in.fr/userfiles/file/mefexexivuto.pdfIn PDF document text
    • http://lemma-studio.pl/userfiles/file/nuramolule.pdfIn PDF document text
    • https://vilnius.cvzona.lt/resources/img/files/28468355102.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16130bbe7bf9a5---nixizadu.pdfIn PDF document text
    • https://barcelonacentremedic.cat/files/galeria/files/tosiwan.pdfIn PDF document text
    • http://peetersinstallatietechniek.nl/upload/files/lanakitemozabopomo.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161311fe4c4785---nixomegogigebadamugi.pdfIn PDF document text
    • http://lrm.mcdonalds.ua/ckfinder/userfiles/files/79969547483.pdfIn PDF document text
    • http://kaushalacademy.org/ckfinder/userfiles/files/dobexudiwokawa.pdfIn PDF document text
    • http://skomi.ru/img/files/file/wumuxegilubuzis.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/c017172e375dfd3569a97040a46af9da/45042210252.pdfIn PDF document text
    • http://businessvaluationapp.com/fck_files/file/32882034567.pdfIn PDF document text
    • http://antwerp-reefer-tournament.be/argt/files/wezoxozokubaluvok.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fbefc6c578---83473071016.pdfIn PDF document text
    • https://jahanchart.ir/data/files/file/bafowagozekadotojoxu.pdfIn PDF document text
    • https://albertoangel.sinecsas.com/ckfinder/userfiles/files/bisiwolatolexivapesejivof.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=fr+legends+mod+apk+carPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cc32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC32 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e449.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE449 10736 bytes
SHA-256: ac1136b78097d274dfbab5d3a5a5dde04cef8ec18a3006fbe4731b9071b0542f
font_02_sfnt_off0000fca9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCA9 2128 bytes
SHA-256: ea0838c56c771baac3e7294113a37a869da30c0923c5234740d3ad99157bc88d
font_03_sfnt_off00010640.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10640 26568 bytes
SHA-256: aba2fae989a8c49ee3f0230a7eb67fc0de05f11645d00fd5f5afab29bfa25cdf
font_04_sfnt_off00014671.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14671 16132 bytes
SHA-256: 071bac7a3a90310621307d68123817e30fba7c89f9e5021c4391eb43bd8b9137

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