Malicious PDF — malware analysis report

Static analysis result for SHA-256 a27ceb3ccca03bdb…

MALICIOUS

PDF

96.3 KB Created: 2021-07-22 00:21:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 8b28a562ae8b31cef50bcd02c5020350 SHA-1: b8be7f48c79b75d99ee50698a22455e7bd296871 SHA-256: a27ceb3ccca03bdbf6ad04a2bbc1cf29982d88b40ddf244ecc47d2f693905af2
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. No scripts were extracted, but the link farm structure is a common lure for users to click through to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/160bec004a5067---kurelixijovu.pdf In PDF document text
    • https://a2designbg.com/userfiles/file/lovopufesagudenizilajero.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d68c27bcc2e---18638380147.pdfIn PDF document text
    • http://sochistandart.com/ckfinder/userfiles/files/30610231961.pdfIn PDF document text
    • https://tranduongauto.com/app/webroot/files/images/pages/files/givadilo.pdfIn PDF document text
    • https://cvsc.co/userfiles/file/6087553912.pdfIn PDF document text
    • https://sport-jicin.cz/dokumenty/raputegevisovifefanananu.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/e2e2611e02e0c59aec97bf9273023417/mekepalinufilivabuban.pdfIn PDF document text
    • https://monyetjoget.com/contents//files/domigoripuwokuwa.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a954bc070fc---vikijugifunaxolapuvu.pdfIn PDF document text
    • http://www.asslar.de/downloads/1564578136.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/649e14cb79aa690ed5844bd232568bbd/63249521593.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/nuxuvetironetapom.pdfIn PDF document text
    • http://thailaundry.com/imgUpload/files/80452602036.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/024ce3ce85ac78ac19990cbd13f3d354/41941703307.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b4e11155350---4708761733.pdfIn PDF document text
    • http://xn--80akazwaeiw.xn--p1ai/editorfiles/file/jirarokosigoxudumi.pdfIn PDF document text
    • http://dent-pro.cz/pic/file/93600846466.pdfIn PDF document text
    • http://maility.pl/_ADRESuserfiles/file/didubemuwen.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160743e72c8d1d---mewum.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/8994ca9dd2d811fece98c2993aca4a6b/lizinibisa.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/d6fa68394a465651b3327501332f0290/ruxikekufuzolezevoku.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160ba7b6de7332---62313266431.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/654ec1c0aedd459eda83db259c6b396f/febajisufawuwutuwam.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/46452436848.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=things+to+do+in+everett+wa+todayPDF 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_off000116cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116CC 10708 bytes
SHA-256: e1bcfa727e42992b26104662445a3e64a92c697b87b98cc5f98bb0a1040e5074
font_01_sfnt_off00012f32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F32 16904 bytes
SHA-256: c2f9ab78255700a1d279faa584e00fda72d33416b60e0b69093017d0e02843a6
font_02_sfnt_off00015b75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B75 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1