Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfa308ad1a97ca49…

MALICIOUS

PDF

72.6 KB Created: 2021-09-01 18:10:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b12ef27a877a7331c193795f11ba67c1 SHA-1: 55b162330c4b879fb45745653a4fe8b84cda025a SHA-256: cfa308ad1a97ca49c902be786fe37a0223dabd19cbc392c6f3425491b90a1e81
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF sample contains embedded JavaScript, which is a common technique for executing malicious code. The numerous external URIs, many pointing to compromised WordPress installations, suggest a link farm designed to redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c5c9d992a46---kuladeligodulebogitexek.pdf In PDF document text
    • http://fewo-spreewald-schoetzigk.de/brandenburgtag/img/editor/file/716718216.pdfIn PDF document text
    • https://pratham.one/file/47376149226.pdfIn PDF document text
    • http://wjvanderheidedienstverlening.nl/uploads/file/nofotunutilerenod.pdfIn PDF document text
    • http://dahchen.tw/userfiles/file/mixenuxalonok.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4f5498f679---nokerurekorogoforuvur.pdfIn PDF document text
    • http://metall-press.ru/files/suborofogofobu.pdfIn PDF document text
    • http://danburyhighclassof1961.com/clients/b/b4/b42d7d7907ff1a67dd6fd366dd3c6775/File/wejiremaxo.pdfIn PDF document text
    • http://longbienco.com/js/ckfinder/userfiles/files/98576706784.pdfIn PDF document text
    • http://sergeybazarov.ru/file/99306521419.pdfIn PDF document text
    • http://loadcell.vn/Images_upload/files/24004190371.pdfIn PDF document text
    • http://sonkertrail.org/clients/9/92/9260a3c387aed4615f72c72c3a1da295/File/80023232087.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0f3ad18bb3---26083109721.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16086a5fe46fcb---galulivelarefepidu.pdfIn PDF document text
    • https://lensprovn.com/ckfinder/userfiles/files/64987848807.pdfIn PDF document text
    • https://ljlconst.com/admin/images/file/savijonupetitowo.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160ce61ef34a11---zumezazaliro.pdfIn PDF document text
    • https://cafesca.org/ckfinder/userfiles/files/58361698998.pdfIn PDF document text
    • http://thoitrangvabaoho.com/Images_upload/files/najizejedizenimulexaxur.pdfIn PDF document text
    • http://homestationrealty.com/userfiles/files/20956150928.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1956e5d1fc---sanezikasunuvuwumas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=backing+your+vehicle+isPDF 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_off0000ba7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA7E 15900 bytes
SHA-256: 784c1929e7c53c89782693acb6bd6e0a5d3ee79444fb41735fd93323c5b92f35
font_01_sfnt_off0000e377.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE377 10836 bytes
SHA-256: 71427b7062e7b631e94df74286b624a8f959e5d3b04cd0561d57cad86344452f
font_02_sfnt_off0000fc80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC80 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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