Malicious PDF — malware analysis report

Static analysis result for SHA-256 63c1ad2ee6f5a0ff…

MALICIOUS

PDF

90.6 KB Created: 2021-06-27 21:57:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: c6729794a673984cc8c7c28289fa6996 SHA-1: a6fd6ddc10cd15d6e8d114d60a3c9667c8c0a53f SHA-256: 63c1ad2ee6f5a0ff9098b082f0f14744c3a2d59cbde291d02d15dd5c656accd6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised CMS upload storage and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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 https://chcial.ru/uplcv?utm_term=and+peace+be+with+you PDF link annotation
    • http://ijdssymposium.eu/upload/kolamomebetodipuwejupad.pdfIn PDF document text
    • http://lhs60to70.com/clients/3/32/32806278e47d7e4d905c37b1d6ebf04a/File/raninanupifosidesopo.pdfIn PDF document text
    • https://walkandsmile.com/userfiles/file/77033419619.pdfIn PDF document text
    • http://laweasy.kr/userfiles/file/73751283309.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1609010bfef538---98443536519.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/58e57d2703f7dc0818617c77308106cd/62693483252.pdfIn PDF document text
    • http://ekotronic.eu/files/file/juwixo.pdfIn PDF document text
    • http://vasvaripalmuzeum.hu/upload/file/foxitipopaxepeji.pdfIn PDF document text
    • https://murderescape.com/wp-content/plugins/super-forms/uploads/php/files/9c3fb592158381e09329400d0e012223/gezemalat.pdfIn PDF document text
    • https://fultoys.com/userfiles/zebixos.pdfIn PDF document text
    • http://staractivecollection.com/resimler/site/files/45611880745.pdfIn PDF document text
    • http://rts-3.ru/upload/files/70844335284.pdfIn PDF document text
    • https://hirurgija.me//files/81351210899.pdfIn PDF document text
    • https://wkd-uk.com/wp-content/plugins/super-forms/uploads/php/files/67086c204ce5535127068a986acd4057/66916250816.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fac474e766---kenawavujupapisin.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/8017663239963a954edba4f76331020c/dagawagamonozezameka.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/08a861c9da5811eb621fa3c217635b0d/zidemejulapurupesiril.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/falitavatibudukovor.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/88fbb39157af89f7a7a91b2d21a7b2d9/80276328563.pdfIn PDF document text
    • https://topclassgardening.nl/images/file/90145824627.pdfIn PDF document text
    • http://bigband-ulm.de/userfiles/files/98993411576.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d3cad5be33d---35352327578.pdfIn PDF document text
    • http://0-50.ru/userfiles/file/kivixeva.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d355413dbd---diworutalalijo.pdfIn PDF document text
    • http://gocreate.termall.pl/upload/fck/file/22704683028.pdfIn PDF document text
    • https://digidatadecolombia.com/wp-content/plugins/super-forms/uploads/php/files/68bf649f558cdc13c043c428ddb53e1d/xuguwikunuwelo.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ff96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF96 17436 bytes
SHA-256: 47d8114527c413ed2ad4c21a538504cad708d3e2cad968ffb4233df78fd629ce
font_01_sfnt_off00012c8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C8E 10716 bytes
SHA-256: 20970c0c78290401195f0adc7e1ba77850b70c1bfad0e49914cbf7911582f1c5
font_02_sfnt_off00014500.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14500 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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