Malicious PDF — malware analysis report

Static analysis result for SHA-256 cffbac6bccbfcba7…

MALICIOUS

PDF

85.6 KB Created: 2021-08-18 10:32:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: fed9b78f80846613482210fe05c5c8d2 SHA-1: 868ec43837ac7b5a329b15b600f82f1201fa56e5 SHA-256: cffbac6bccbfcba7e828caf08241e8eb698f68eceb8c90324610919f561b2d92
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and disposable domains. These URLs are likely intended to lure users to phishing pages or download further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://smidgel.ru/uplcv?utm_term=ejercicios+de+matematicas+para+segundo+grado+de+primaria+pdf+mexico PDF link annotation
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095b0b638474.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/84021860781.pdfIn PDF document text
    • https://marathonroller.com/userfiles/files/rinoganejot.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/7159319343.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a6d55e6206---72573824423.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092da11f28ad---wevovunigoberopulaxuj.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/ochpplc5ea32nj7psdcs0q4e5n/kugemevewomofuwi.pdfIn PDF document text
    • https://damiel.eu/userfiles/file/pezoveba.pdfIn PDF document text
    • http://newgatedesign.com/Images_upload/files/16087190915.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/n8pcft5dih32tme95q8htjtn03/90608551983.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a27da37474---ganukokaxudumisopagib.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/63p2us73ato7nas4qgduh06ce1/tirevisubapuguxisa.pdfIn PDF document text
    • http://candemdientu.com/Images_upload/files/tewujaribijoxelorofitedux.pdfIn PDF document text
    • https://cdmsig2.com/ckfinder/userfiles/files/48426706888.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095a8270d76a---wimemugejemogetodo.pdfIn PDF document text
    • http://kompletucetnictvi.cz/files/file/78513133090.pdfIn PDF document text
    • http://upoart.com/ckfinder/userfiles/files/weximomeru.pdfIn PDF document text
    • http://xboxheerlen.nl/userfiles/file/12493528178.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/51c3dc830912c0c7a7ef5e9835a22478/bufoxikuganowirubefupodu.pdfIn PDF document text
    • http://change4best.ru/upload/file/wagusuwovidaziwedafuda.pdfIn PDF document text
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160772e2911d6a---78337774113.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_off0000e450.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE450 18792 bytes
SHA-256: 85c3b51e054cad38af382624641b31cf63a7f21c5dd200781f31efd7156517eb
font_01_sfnt_off00011419.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11419 11232 bytes
SHA-256: e752a553c011c49ba9f17f44f22b893e394f6af9522008299772792e0b004cbc
font_02_sfnt_off00012e38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E38 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1