Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac06eeef1662c76b…

MALICIOUS

PDF

82.4 KB Created: 2021-08-06 20:44:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-24
MD5: 20ab11cd29bc76e2a18fd98feae2a5a7 SHA-1: 200971164e135e8dea0468fbfaf2e6dce95a82d3 SHA-256: ac06eeef1662c76b5b036f913f77551ca2d81f89edcd57d36cc71eb7ae299e0e
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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, presents a deceptive download button and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://pixomot.ru/uplcv?utm_term=ethiopian+grade+11+physics+textbook+pdf+download PDF link annotation
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609a98c78adfe---jefifipilifivof.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/78l905a236g093sib44chn23gu/92234999951.pdfIn PDF document text
    • https://www.westcountrystoves.co.uk/wp-content/plugins/super-forms/uploads/php/files/976f85dcdd961a638e9ed52bf16a6c00/97283833312.pdfIn PDF document text
    • https://pbchistoryonline.org/uploads/file/xazevajejiguza.pdfIn PDF document text
    • http://paintmaster.hu/js/ckfinder/userfiles/files/77697349961.pdfIn PDF document text
    • https://sanruouvang.net/images/uploaded/file/4052883839.pdfIn PDF document text
    • https://daismene.it/file/19445363441.pdfIn PDF document text
    • http://siltherm.com/ckfinder/userfiles/files/tupalabomumuzefugoravi.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/df1d39ebbe8e840dfdd42e6879f31c78/54595031329.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/47fe3fca0c7c686a747fe473d3e7f5f4/tutikiberegu.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f806e50eb3b---korenojonuxapivonepu.pdfIn PDF document text
    • https://aashianarealty.com/file/14494696304.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16074c603ecdee---74242378126.pdfIn PDF document text
    • http://medtravel.pro/images/hand_uploaded/files/70083298257.pdfIn PDF document text
    • http://fusheng-vietnam.vn/admin/webroot/upload/image/files/lenatigedodenijotixedin.pdfIn PDF document text
    • http://luvnchrlysenglishtoys.com/clients/861429/File/vugosutoji.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f5c9f37f69c---45408453638.pdfIn PDF document text
    • http://struttur-arch.it/userfiles/files/fepavigizidi.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073989a19bb6---regem.pdfIn PDF document text
    • https://tierrettung-in-katalonien.org/ckfinder/userfiles/files/pevapobuvojarufisuxagemib.pdfIn PDF document text
    • http://petraifevronii.ru/ckfinder/userfiles/files/93802711116.pdfIn PDF document text
    • http://myexamadvisor.com/fck_uploads/files/59310115076.pdfIn 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://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_off0000c804.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC804 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e016.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE016 16208 bytes
SHA-256: ee71715ef2dfd924fe75671d761439e9b9a310776a53eda457c78a527e90af77
font_02_sfnt_off000109cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109CF 16132 bytes
SHA-256: 43ac470fcea589ff610178d7ee8b4eca3d7ebca5e1a90d9dbe30350601643f36
font_03_sfnt_off00011f13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F13 11468 bytes
SHA-256: f77ffb7f76e0d2f9f552e85741093aa5b719dddd34bc207deb80bb144979ed36

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