Malicious PDF — malware analysis report

Static analysis result for SHA-256 6dd61e466ca48452…

MALICIOUS

PDF

92.4 KB Created: 2021-06-13 14:50:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: cb8a884c033018ae9d0ae7b30b3c1173 SHA-1: 9b0900f978ae1db42af06bb17bc61798ab2ac6eb SHA-256: 6dd61e466ca4845236fe5e1119b56e63703fc330d83db42d7389aa345f964e58
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution intent. It functions as a link farm, containing numerous URLs that point to compromised websites, likely to lure users into downloading further malicious content or submitting sensitive information. The presence of multiple external URIs and compromised CMS upload links strongly suggests a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://infrive.ru/uplcv?utm_term=deep+sky+wonders+pdf PDF link annotation
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160856227a0b26---95062101780.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/160966fb9c1fb4---98270101229.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a983860fc4a---9262383114.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/unedph09m6dq5buirtke0udqf7/bajanufolepabupixixudivo.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/3ttgr736qvmgns9rpbh44f1aau/30395171042.pdfIn PDF document text
    • https://uniontend.com/userfiles/files/wanobikixakixumikukegu.pdfIn PDF document text
    • https://renault-service.com/userfiles/65115635846.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160b629c09a414---37973351225.pdfIn PDF document text
    • https://mfdesign.hu/files/file/bovapudufigogowipusi.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/nusoworazasesisev.pdfIn PDF document text
    • http://tryinvest.eu/userfiles/files/mepep.pdfIn PDF document text
    • http://unesco-mediain.cz/fckfiles/file/vuxusomuzuwoxu.pdfIn PDF document text
    • https://acgroupenterprise.com/userfiles/file/28259666725.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160845ae496a57---95832923668.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/r0a9t79hcvmk09i3uruole1163/98862976161.pdfIn PDF document text
    • http://murphysbeads.com/clients/54316/File/27422910002.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012afd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AFD 5052 bytes
SHA-256: 493faa8ef31205f100d99ef26931770e4ce716cf41b9aedfc66d235d9f4d9667
font_01_sfnt_off00013c5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C5E 11336 bytes
SHA-256: 754a766f55f29ec27ded413a8f9e0875330145a9e2e22f4f2e3c51e03d06e21d

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