Malicious PDF — malware analysis report

Static analysis result for SHA-256 41f04a03055373c3…

MALICIOUS

PDF

93.1 KB Created: 2021-08-04 08:49:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 21908ee2629ee961bf480d293d3eda2b SHA-1: 4e9c8354750f3fb07f1fd5618825266d9f450f6f SHA-256: 41f04a03055373c3c36aebfd44b9a1f5d06d6b25af29c0a2a5bcf571a12db0b5
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.roadsafetyrental.com.au/application/third_party/ckfinder/userfiles/files/1806692492.pdf In PDF document text
    • http://chretkinia.pl/userfiles/file/sefejosutonulesav.pdfIn PDF document text
    • http://bycongroup.com/UserFiles/file/niguzuzazojadugulo.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/714d95433a475b72c6bcc18a6f1d506f/79734411109.pdfIn PDF document text
    • http://asu78.ru/userfiles/file/10743104336.pdfIn PDF document text
    • https://invest.pl/userfiles/file/89064563458.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607934f930db3---67350682847.pdfIn PDF document text
    • http://ohappy.org/userData/board/file/tixobaromifute.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/719afe1b0d7b4b7d28f22a53f709a26a/18772894044.pdfIn PDF document text
    • http://safeabortionnepal.com/userfiles/file/79185793144.pdfIn PDF document text
    • https://108pizza.pl/uploads/userfiles/files/mifigudisaruxez.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/22920763059.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b0ddfa9d58---nukefelajabokosimusuvu.pdfIn PDF document text
    • https://vivekanandbawwa.com/userfiles/file/74120702982.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160768250e5b7b---47975741532.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160bdb98c7cd5b---67811306137.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606da6f21f292---59314171892.pdfIn PDF document text
    • http://gruppocinofilomarsalese.com/userfiles/files/35216257400.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/91400408867.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/56a09663129d8442edb37875a40f9664/vagex.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/file/sidurikopepigefe.pdfIn PDF document text
    • http://pilot-market.ru/new/files/file/kuluvexafilivima.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=yowhatsapp+2+atualizado+2019+download+apk+mediaf%C4%B1rePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC08 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001041a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1041A 17420 bytes
SHA-256: 737d5665bd0257acb55259978eadc6748bec7ee25cb9b1dfd8b46a98e170d604
font_02_sfnt_off00013161.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13161 11592 bytes
SHA-256: eecc30a4476c0e2a11549a6d2b3b3eb009f46a3241ed3fdb1799e189cbfbcce0
font_03_sfnt_off00014cc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CC6 16656 bytes
SHA-256: 5dcd78039a1da1a6e4387c3f61b01e5bc60521b5d5a4d25661bd58bd45801183

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