Malicious PDF — malware analysis report

Static analysis result for SHA-256 858f99762ce9cd63…

MALICIOUS

PDF

87.1 KB Created: 2021-07-29 21:17:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 2b1c38384a6ca734694b526c690ebc29 SHA-1: 04df682b124ebd641d063b5f85f10ed3c19f8d5d SHA-256: 858f99762ce9cd63b2678ee1dc8b6634f94e6fe128f627f22011b56a89da3b7d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains a link farm pointing to multiple URLs, many of which are hosted on compromised CMS upload directories or disposable domains. These links likely serve as lures for phishing or to distribute further malware. No scripts were extracted, but the presence of numerous external links suggests a redirection or download mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://tractorpulling-emmeloord.nl/upload/file/90988575905.pdf In PDF document text
    • http://asea-admin.com/_userfiles/file/20210723212016.pdfIn PDF document text
    • http://parkety-patemal.sk/files/file/52678440379.pdfIn PDF document text
    • http://greaterdeliveranceministries1.com/clients/61527/File/73666573344.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16094a09142526---zunolata.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a46d0de8a50---13020786122.pdfIn PDF document text
    • https://xn----7sbbjg7ctfs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/139bca5ea0212f02a269687c29ddcab6/9702052573.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089a7b9a6744---sanijekenogi.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/9f81d65b2fdf532fb8b7c87e97e3a702/20344512238.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160741e3c42324---87750344701.pdfIn PDF document text
    • https://viboot.com/ckfinder/userfiles/files/risixupidutavej.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160845c32d3ac9---fapomigunama.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/1608c7d1f4d51f---janumigoxefisupuzo.pdfIn PDF document text
    • http://bogieclassof67.com/clients/71235/File/14303158518.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/160df4d763c6a2---sazubexabaropug.pdfIn PDF document text
    • https://cowichanseniors.ca/userfiles/file/giluk.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/7ae2e160c5d8a58135d157936456c59a/gofexijinikuvagasobe.pdfIn PDF document text
    • http://varanini.pl/userfiles/file/30024591595.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/rlmpqdkjntiqg204d9g7n8ui36/52878526135.pdfIn PDF document text
    • http://k-souz.com/userfiles/file/68403145113.pdfIn PDF document text
    • https://cornwallstaffagency.com/userfiles/file/75365546355.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e910b4c1d1---fosubiladuzumovexaxoxar.pdfIn PDF document text
    • http://nipissing-lodge.com/clients/b/be/be32fa5c9d1e5a871f1efa0d35b29fe7/File/69201748176.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=how+to+connect+to+oracle+pluggable+databasePDF 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_off0000ed38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED38 10916 bytes
SHA-256: 6f6af5015f44595ace485a6249d758d0c8cc45a726a0ff4eb82c0519c1f94ada
font_01_sfnt_off00010636.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10636 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E48 18020 bytes
SHA-256: 455c414b980cbe602c0d44603b101be7304b19c0e23e99fe64a432a7d5ba29d5

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