Malicious PDF — malware analysis report

Static analysis result for SHA-256 c80180f3a20a6f2f…

MALICIOUS

PDF

80.3 KB Created: 2021-09-11 20:00:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4383bf7540a39ee6e1232d5b3f446b5e SHA-1: a75774a838643d05f2328d77fb33326652054880 SHA-256: c80180f3a20a6f2f0d4a9605a351712d920ae0252dbc2834fed0efad9cb96895
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous embedded URLs pointing to various domains, many of which are hosted on compromised or disposable infrastructure. The presence of these links suggests an attempt to direct users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://hysansam.com/fckeditor/userfiles/image/tuxolifelawerakesiveba.pdf In PDF document text
    • http://alltimescare.com/attachment/files/fukojawuwulokigole.pdfIn PDF document text
    • http://topbuild.net/content/xuploadimages/file/xudozumumuro.pdfIn PDF document text
    • http://ibb-online.ru/f/file/retomupujokovikaxatakad.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613b3da8eddb8---53102856237.pdfIn PDF document text
    • http://ineke-ott.nl/keramiek-beelden-imagesfile/misulozunazonewavin.pdfIn PDF document text
    • http://zit-tech.com/userfiles/files/bejorutegomofibeguleto.pdfIn PDF document text
    • http://podarox.ru/public/files/fegigu.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/ukts17clh4h0iq5ed58i974174/43497760212.pdfIn PDF document text
    • https://mma-montessori.com/admin/ckfinder/userfiles/files/dubogadetifiw.pdfIn PDF document text
    • https://dzido.pl/userfiles/file/temelajawonamabitugaxoje.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130f8f20ece1---36196774831.pdfIn PDF document text
    • http://studiochiodo.eu/userfiles/files/62796215299.pdfIn PDF document text
    • http://sistersaviopublicschool.com/userfiles/file/24222591687.pdfIn PDF document text
    • http://pomelieagency.com/userfiles/files/tudoxewirisosenakipiti.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/68a582efd25bab202d7e1fec3b341498/71814073194.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/9a8bcfb6074385582be150b7f45866a8/75992165002.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/pbc9pbqlo752g9m73hcp4qs1vk/91207154459.pdfIn PDF document text
    • http://etabetasurvey.com/userfiles/files/jebofekodove.pdfIn PDF document text
    • https://basisangka.com/contents/files/zubixojowezigimuguxenaxa.pdfIn PDF document text
    • http://euro-ex.net/images/blog/file/9870933504.pdfIn PDF document text
    • http://wwpokebar.com/uploads/files/53998780824.pdfIn PDF document text
    • https://ascii.tn/web/cgi/file/lokaneki.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=android+deleted+photos+locationPDF 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_off0000d76b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD76B 17048 bytes
SHA-256: bd7cf04aa23a5abe56860c58d8650d6fdefe061766e7435b2cb39cf7646b98e7
font_01_sfnt_off0001038c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1038C 10592 bytes
SHA-256: 2bec6fea85f58c89af3eab94369e254b387d3cdc0ecd9f1777925484d511e178
font_02_sfnt_off00011bab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BAB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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