Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfffbfe5374153ff…

MALICIOUS

PDF

77.6 KB Created: 2021-09-04 06:56:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: bb29468de82c20be43902713146627bc SHA-1: 2346bb5dd5c07d4dfead507bbadb74145aad8c68 SHA-256: cfffbfe5374153ffb685b5b979425690136e17990aeabe0d0c19079a7f9b5b47
156 Risk Score

Malware Insights

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

The file is a PDF containing a link farm, with numerous embedded URLs pointing to other PDF files. Several heuristics indicate these links are hosted on potentially compromised CMS upload directories or disposable hosting, suggesting a phishing or SEO poisoning campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious content or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9901

Heuristics 6

  • 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 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://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1611d356e54a12---monafiruriji.pdf In PDF document text
    • https://asset-books.com/userfiles/file/jawupa.pdfIn PDF document text
    • http://flemisterbauldingfamily.com/clients/8/82/82a21d9598fc66f9117a8fb7222c8fd0/File/xeleganibirugumovogotemog.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/ra7bbamrq7h3v1u4cghdvftuid/puriwavuvomiti.pdfIn PDF document text
    • http://lutechmed.com/Images_upload/files/66276974119.pdfIn PDF document text
    • https://samudra99.com/contents//files/zozefatulaxixujixaforux.pdfIn PDF document text
    • https://melnikhouse.com/userfiles/file/85745743923.pdfIn PDF document text
    • https://yodishit.com/uploads/userfiles/file/17972920989.pdfIn PDF document text
    • http://phunggia.biz/userfiles/file/19435583884.pdfIn PDF document text
    • http://teresachild.com/upload/files/tigigitumeluz.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f87e491aed---18448230973.pdfIn PDF document text
    • http://stadtbild-intervention.de/Quansis/ckfinder/userfiles/files/20785954405.pdfIn PDF document text
    • http://inruho.ru/ckfinder/userfiles/files/64204644357.pdfIn PDF document text
    • http://china-hold.com/UploadFile/file/20210517021007837.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/9767593538f8da75068e9f2e8c484960/jawaviranakogidugekimawa.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609aae9ac95a6---vuriloxux.pdfIn PDF document text
    • http://fskyok.com/uploadfile/files/5122768354.pdfIn PDF document text
    • https://ihotel2b.com/upfiles/editor/files/38102959380.pdfIn PDF document text
    • https://dgaspcsm.ro/ckfinder/userfiles/files/82118826769.pdfIn PDF document text
    • http://yjccnc.com/upload/files/10044934485.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612a33dbca8f7---ledepulagapagasetapovola.pdfIn PDF document text
    • https://www.saammohaseb.ir/wp-content/plugins/super-forms/uploads/php/files/baa6872b1775f68d8412d42ef1d30cd7/rifolotozenuxajeze.pdfIn PDF document text
    • http://hrt-foto.hu/_user/file/lilesatitovofakudezaji.pdfIn PDF document text
    • https://rlmahtani.com/userfiles/files/xagirokejixuzotomebumer.pdfIn PDF document text
    • https://bursakaynak.com/userfiles/file/37809056856.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/toriduxatedenosikipuji.pdfIn PDF document text
    • https://nnt52.ru/userfiles/file/4795022183.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=word+to+pdf+converter+offline+freePDF 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_off0000cd2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD2E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e545.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE545 10340 bytes
SHA-256: be86e4c89c1c83bec542cc007d40e59db5d3a24ca29d34c0e45ad2c3a1d0a84e
font_02_sfnt_off0000fcb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCB0 16872 bytes
SHA-256: 697e8cfcbbba7241198ede71a30b92ceffcd528cd4542ce7460237e6ee87e036

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