Malicious PDF — malware analysis report

Static analysis result for SHA-256 d797caf7ac32db87…

MALICIOUS

PDF

90.2 KB Created: 2021-07-02 23:02:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 9e641722612e0fcdfe0cbcdb201beabb SHA-1: 16eedf9b11320f85ef174a97714852d68e749485 SHA-256: d797caf7ac32db87761cba3a46ddcde1dbf1b4f6ee0b9d8526be5410fee296c8
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier, with ClamAV detecting it as a phishing trojan. The document contains a link farm pointing to numerous PDF files hosted on various domains, suggesting an attempt to distribute malicious content or conduct phishing. The presence of external URIs and a link farm on disposable hosting indicates a likely spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://irlanc.ru/uplcv?utm_term=cbse+syllabus+for+class+1+english+book+pdf+download PDF link annotation
    • http://skncn.com/u/files/fizubodinaruvulel.pdfIn PDF document text
    • https://benjamindreyer.com/wp-content/plugins/super-forms/uploads/php/files/ccb508a45e3cd56ed7ae009cf7c814b0/busoroduwem.pdfIn PDF document text
    • https://uleiuri.ro/userfiles/file/tirufoxulesilimejevana.pdfIn PDF document text
    • http://charivne.info/images/file/75874125984.pdfIn PDF document text
    • http://megaprestige.ru/uploads/files/sobibapuwigedonov.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/421df96982ac336948b68c945bd9376b/32257619426.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb123787e9---rojemuxel.pdfIn PDF document text
    • http://duancanhotot.com/upload/files/pumitodiluwovafab.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/710d226277cb28878df7abd98abe2054/98686467794.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c75d2a1b0ed---18810354334.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a92f61de737---sobinuzapubibasobidojil.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb55acbe86---26090724989.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/aa4c00c38f3355075daa6be40c83e5b7/35121082651.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076a156c7d5c---29644132351.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b32d63df0de---73557340215.pdfIn PDF document text
    • http://jarosi.hu/files/file/50208517035.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/21d5unnt989r62d765jtu7dme4/88860322337.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ba6c7b40dd4---21538025851.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c9cc6d3621f---77237625909.pdfIn PDF document text
    • http://olimpic.hu/ckfinder/userfiles/files/mutagevapixod.pdfIn PDF document text
    • http://wildpflanzen-planung.de/file/fagek.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607afd320464d---vasozurezukininuwonudido.pdfIn PDF document text
    • https://bonafideonline.com.ar/wp-content/plugins/super-forms/uploads/php/files/7df247788fc4489430d4a80fa9f4f0a1/kosopobepekojotepifevaju.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/4dc316b5b87f23e4d9ccd9f526b5bd95/39648854792.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/17549793268.pdfIn PDF document text
    • https://alshaabcoop.com/userfiles/file/fuvofogasute.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_off0000f5aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5AA 11416 bytes
SHA-256: de2c5b819a07eab370a3e8b40fe17ea5fb5686cd36a4515c4d3deab0cce1a2e2
font_01_sfnt_off0001103f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1103F 18964 bytes
SHA-256: d95f3d3514903145926382a4761d5baea5b50c0a0ec6bb69d165d67c9f568930
font_02_sfnt_off0001410c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1410C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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