Malicious PDF — malware analysis report

Static analysis result for SHA-256 f56c565bb2fed30c…

MALICIOUS

PDF

84.6 KB Created: 2021-09-08 12:04:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 6f09ade758a8b044ccd23eccb2fe9636 SHA-1: 512394e5b73aaf3f22d1e6ab144cb1069d14c431 SHA-256: f56c565bb2fed30cbe7ed7d1e04b290b61f01120d0fd5e7434f4d39d75c645bc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains a link farm with numerous URLs pointing to potentially compromised websites, suggesting a phishing or malware distribution attempt. The presence of multiple external URIs and links to disposable hosting indicates a deliberate effort to obscure the final destination. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest malicious intent, likely related to spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://wastran.ru/uplcv?utm_term=comptia+a%2B+1001+and+1002+practice+test+pdf PDF link annotation
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160aa5b88eb4a0---18055667218.pdfIn PDF document text
    • https://tasleemdubai.com/userfiles/files/92741816865.pdfIn PDF document text
    • http://exclusivelimoservice.com/ckfinder/userfiles/files/wogilasupew.pdfIn PDF document text
    • http://myphamnanyno.com/luutru/files/30930645289.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc012f70b75---wazaximibonuv.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16097166fdb7ad---wodajetazed.pdfIn PDF document text
    • http://bibrka-school.org.ua/ckfinder/userfiles/files/146264200.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/528db3f4e7a6de18d0382c0071f2eacc/87214207999.pdfIn PDF document text
    • http://nktrading.qa/file/files/33733630979.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/cf0dd02d0f4de4bbbb5dbd94487bfb83/nibejizanipedesitebifolud.pdfIn PDF document text
    • https://soechi.net/userfiles/file/zavovemevafipetes.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608b8c8edbc8f---27667121361.pdfIn PDF document text
    • http://skyrybupaslaugos.lt/uploads/files/bigalijiz.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/8d2d1e23e273ba96e11263f3f6b4b5bd/45775042966.pdfIn PDF document text
    • http://dgjst.com/upfile/file/26031725465.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160bbe82458ea4---vitazobukoluligonasoti.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/gimebigepuninadexa.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/4b6114f60bc3f5bd8c4057acb7cf1aea/70060809309.pdfIn PDF document text
    • https://dienlanhhonganh.com/images/pic/file/wenonafok.pdfIn PDF document text
    • http://alfonsoguiggiarchitetto.it/userfiles/files/rupojegusapawul.pdfIn PDF document text
    • https://keralatemples.info/ckfinder/userfiles/files/nepusamiwurazaxemosapus.pdfIn PDF document text
    • https://securityguardsupply.org/php/uploads/file/36683836853.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/qku3e7hk1ihputv1857p2uik9o/57335687196.pdfIn PDF document text
    • http://s292376414.onlinehome.fr/datas/imgmail/file/jeputavoxeluxinariv.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_off0000e56c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE56C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD7E 17508 bytes
SHA-256: 32b9d545e2b0b78467ac5b999b99b3adc65b0acef9316bccaf96f1234e2a4111
font_02_sfnt_off00012ada.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ADA 11060 bytes
SHA-256: 2a381c5cbe3257b6b0c1fff12356186316a01fc49d3ad741a4b0de8e3fdb0797