Malicious PDF — malware analysis report

Static analysis result for SHA-256 aec491c510845bb7…

MALICIOUS

PDF

85.8 KB Created: 2021-09-19 04:31:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 746b99db0fce6f4dcea80cb43b4b6582 SHA-1: f57efd8f05b449fd8cae647451270533102b03d8 SHA-256: aec491c510845bb706a09a28c3b1ea30983b37a8a77a22edcea3f120cfc31886
156 Risk Score

Malware Insights

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

The file is a PDF containing numerous embedded URLs, many of which point to compromised websites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic confirms the presence of a link farm on disposable hosting, and the PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristic highlights links to compromised WordPress uploads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://nomylo.ru/uplcv?utm_term=how+to+say+it+at+work+pdf
    • https://poojaindiangrill.com/nbloom/fckuploads/file/63289289342.pdf
    • https://duvanco.be/docs/files/68384695744.pdf
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/43b73266793b5f7170b92dc23d0e4abe/fajubusitiwewigabure.pdf
    • http://fasson.vip/images/editor/files/bejigafusegapifexu.pdf
    • https://073741256.com/uploads/files/202109181727554113.pdf
    • http://msinziniering.com/userfiles/file/83410544097.pdf
    • https://profm.hu/files/file/70662363376.pdf
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141b9de15127---21868690556.pdf
    • http://punaide.com/userfiles/files/69334621830.pdf
    • http://local-minicab.com/survey/userfiles/files/bawiradosezejituv.pdf
    • http://31kouqiang.com/userfiles/file/1630648016.pdf
    • https://ganport.pl/userfiles/file/vilidumorin.pdf
    • https://carparts-fixture.com/file/file/92782617643.pdf
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/lmmrt35mce4qnhmaurer0npbb0/10339447847.pdf
    • http://suliaok.com/v15/Upload/file/20219171456361549.pdf
    • https://oferta.lt/i/File/kagozewujudedozodiretige.pdf
    • https://tonere.shop/app/webroot/files/userfiles/files/zetexexupigasidixexiw.pdf
    • http://neoneofytou.com/ckfinder/userfiles/files/wemozixoxiwitelimiwuwuso.pdf
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/e6ddebe12b5986dcbc66cf7edc05813d/23269873189.pdf
    • https://wedding-photos.cz/userfiles/file/10502200967.pdf
    • http://koreaseowon.com/ckupload/files/76669449491.pdf
    • http://grasslandtj.com/upload/files/86137347639.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea77.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA77 16792 bytes
font_01_sfnt_off00010289.bin
51c388156a44d17e9b1ea0f94a14cc978f1499896330d4cc7a82fd4be964171a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10289 18332 bytes
font_02_sfnt_off00013216.bin
dbf4171d842c32af54cace2057d5f64452b40f11810c0ab9cf5754da96459a94		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13216 10492 bytes

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