Malicious PDF — malware analysis report

Static analysis result for SHA-256 4690ec032ce89991…

MALICIOUS

PDF

104.2 KB Created: 2021-07-23 04:14:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: d1e3baa63c445d9a6b7f855495ff3460 SHA-1: 7f9bcfb186e3d3ac00ebb317b5669dc75b0c76eb SHA-256: 4690ec032ce89991ff45b0a8174f1e5b918fb4010bc9504fdcee73af83a0aff4
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised CMS upload storage and disposable hosting. The primary purpose appears to be redirecting users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://champaigncursillo.com/userfiles/file/wutus.pdf In PDF document text
    • http://skikk.be/app/webroot/files/userfiles/files/20554061330.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/5326cfdf109c9298eae8ab6aa839df10/tumuxuro.pdfIn PDF document text
    • https://lamaisonducoeur.ca/upload/editor/file/kalabenavarateminel.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/rlhak1smplcitbcroei9jc657a/93738519511.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/kfcst68m0ul2dn0hf4c3su30a5/dososemofozorepaxi.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/a1883b09bfc3b5d5339cd49ebdf835a4/fopulifazafonosofuk.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160cf3c2dd1166---nofoxujenuxibejutabisofat.pdfIn PDF document text
    • http://keysrotary.com/clients/d/da/da683cbc30bfd632b0b364d14bdd38fd/File/57430226424.pdfIn PDF document text
    • https://dailyhondaotomientay.com/upload/files/9986286420.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2e023fdfd---47853852869.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/f8a796de2bde9615180bdce820a0d2cc/97056713466.pdfIn PDF document text
    • http://learningkey.org/userfiles/59792187264.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b22c210e3a1---kajezidizaw.pdfIn PDF document text
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16098c41ec071c---87172079927.pdfIn PDF document text
    • https://drlanda.hu/user/file/refarasazirejarekon.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160844567f32d2---jukejurikedozawix.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2f0dcda04f---28218674010.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/0est531i5j7qjvvl0fhh491nus/lovuz.pdfIn PDF document text
    • http://alianzablue.com/aym_image/files/30891068008.pdfIn PDF document text
    • https://ssvacancy.com/ckfinder/userfiles/files/depomi.pdfIn PDF document text
    • http://ahdongjiu.com/upload_fck/file/2021-6-5/20210605221955705953.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607e211e8959d---64428629093.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=httyd+the+red+deathPDF 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_off00013727.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13727 17124 bytes
SHA-256: d3a006d0a7208b9be8237ce3b5bcc862c3879dcd938d45a71e5b65064829f7cb
font_01_sfnt_off000163d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x163D2 9920 bytes
SHA-256: 1b3540016b5724f3f44bfcb336977a801e51f09740b848eb235003a94c822c9a
font_02_sfnt_off000179ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x179CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1