Malicious PDF — malware analysis report

Static analysis result for SHA-256 eab0f17a2a4b0875…

MALICIOUS

PDF

79.6 KB Created: 2021-09-06 12:46:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: eb56b29c55776a073e22a68b68e4bf86 SHA-1: f69b1b7e005b59200ef2b7ce20d9abb618d1fcfc SHA-256: eab0f17a2a4b08758cc400c208f2a2dc125ef196f60386002873e4547c17f26a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised CMS upload directories and disposable hosting, indicative of a link farm designed to obscure the final destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://aygroupmuh.com/image/files/33070004362.pdf In PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160849213678de---mojujebogavabafokikat.pdfIn PDF document text
    • http://pnktools-th.org/ckfinder/userfiles/files/sowuzusavefudodatomezem.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/93c8e97e8519c7424c108df9112d4307/tevam.pdfIn PDF document text
    • https://jasz-pap.hu/UserFiles/file/44945266073.pdfIn PDF document text
    • https://seeandhearbetter.ie/img/shop//contents/wemimuwuwimoko.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/7a727a91f8939eab5281c67ad655fc64/65591543863.pdfIn PDF document text
    • https://ayurmitra.com/files/file/ralubazifez.pdfIn PDF document text
    • https://serpavenger.com/ckfinder/userfiles/files/piguzidunoxu.pdfIn PDF document text
    • https://radmangroup-ye.com/rgfiles/file/22576586514.pdfIn PDF document text
    • http://drtamerturan.com/file/kakafapiju.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b97aaa2a37d---40517055143.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/k76v5do8phv0itm792f2qgkm17/dumuvofube.pdfIn PDF document text
    • http://bmcnx.com/userfiles/file/tiwabepu.pdfIn PDF document text
    • https://network-italia.com/file/jizebidutebad.pdfIn PDF document text
    • http://teechart.com/uploads/images/files/18125181594.pdfIn PDF document text
    • http://www.neoneophytou.com/ckfinder/userfiles/files/97779114004.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160811dce2498d---8139594970.pdfIn PDF document text
    • https://patc.fr/imagesfile/luzege.pdfIn PDF document text
    • http://soles2walk.cz/data/file/89419053998.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160788faa38286---tevemuwo.pdfIn PDF document text
    • http://themetamorphoseprogram.com/userfiles/file/60990664095.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/0pl50kl2qk0dk2fmco7qj1cc9u/61735531465.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=ramadan+calendar+2018+karachi+pdfPDF 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_off0000cf0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF0A 11140 bytes
SHA-256: 7a3cdb993910e3c29fea4dad165fe775cccb216ecbe425cee6f4895fe51964c0
font_01_sfnt_off0000e8dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8DC 18148 bytes
SHA-256: d606435f29ee42492d500184b09128b0b25c538eebca4e4f62d531f4e16a62c5
font_02_sfnt_off0001185a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1185A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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