Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf3cdc3a1d80837c…

MALICIOUS

PDF

87.7 KB Created: 2021-08-14 17:55:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ddcc110e469a46bddf0f1172e52b5d8c SHA-1: 8145a3d92467668035724f9ae68efb9a559def3b SHA-256: cf3cdc3a1d80837cb939cbc32b13658e5a4b7ac157545d5d6f669175eedc2f6a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many pointing to compromised WordPress sites, suggesting it functions as a link farm. The primary purpose appears to be directing users to potentially malicious external content, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a88c0c1160a---pomowaxarev.pdf In PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb40d32d87---95806957633.pdfIn PDF document text
    • http://woori-tour.kr/FileData/ckfinder/files/20210623_D816876EA4394C5A.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/o0kolt5damgtjhja9988t13aa2/nelibozisoduvo.pdfIn PDF document text
    • http://xn--e1aaafipco3bk8gra3b.xn--p1ai/upload_picture/file/paxap.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/569b6552fc4f2e1614f76fe646e2139c/55222471876.pdfIn PDF document text
    • https://businesslife.com/content/files/xowojofov.pdfIn PDF document text
    • https://robert-zauer.cz/userfiles/file/46023229159.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3416e6584---zijovawepotadumavulezuve.pdfIn PDF document text
    • http://wahibluedevils76.com/clients/5/55/55d7338a7abcce318bc847d7f34994f5/File/fototego.pdfIn PDF document text
    • http://candemdientu.com/Images_upload/files/36612391609.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/ea3757398993fd5d9b0a30e65647014b/77907118407.pdfIn PDF document text
    • http://terralindahigh1981.com/clients/866868/File/zuvatod.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/10656385304.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607d9341814fb---70332581736.pdfIn PDF document text
    • http://rmgoals.com/userfiles/files/57576281057.pdfIn PDF document text
    • http://medizator.ru/ckfinder/userfiles/files/24498986995.pdfIn PDF document text
    • http://penzionklara.cz/userfiles/file/32393159511.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/tofekozofijotitomez.pdfIn PDF document text
    • http://dermalab.pl/userfiles/file/60469095081.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/16223836861.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=frank+wood+business+accounting+1+13th+edition+answers+pdfPDF 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_off0000f278.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF278 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010a8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A8A 16388 bytes
SHA-256: 3dd28032c30a2d651bb8341f4ca0518369bea53e68ad5abff5cc959c39203415
font_02_sfnt_off000134c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134C9 11472 bytes
SHA-256: f192c2a3a8916988bb04e631eb9520a0caa40bb04cd29dc0dee023337042abfd

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