Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac19fc46ba99dd53…

MALICIOUS

PDF

72.3 KB Created: 2021-09-10 14:06:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: fdc8c86678f5d90de4d13a5e68fc4a59 SHA-1: 997709cecd32e7b87b3f793a6b1378836968e3e2 SHA-256: ac19fc46ba99dd53635d5b39d842e6aec98ed2e6ce761138e3427ea09c445f49
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were directly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://inwebjor.ru/uplcv?utm_term=how+to+unlink+iphone+contacts PDF link annotation
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/161394960590ff---karakojijol.pdfIn PDF document text
    • https://produktybhp.pl/pliki_user/File/797412555.pdfIn PDF document text
    • http://prtourusa.com/FileData/ckfinder/files/20210908_6EA1041E13498103.pdfIn PDF document text
    • http://centonze-vini.com/userfiles/files/83519859410.pdfIn PDF document text
    • http://volareinmongolfiera.it/userfiles/files/12275577317.pdfIn PDF document text
    • https://keluargamimpi.com/contents/files/93527769165.pdfIn PDF document text
    • https://learningsolution.ca/userfiles/files/54250446013.pdfIn PDF document text
    • https://globalybm.com/ckfinder/userfiles/files/1631114132.pdfIn PDF document text
    • http://fuhua.tumujike.com/assets/upload/files/202109051208378078.pdfIn PDF document text
    • http://arredamentoambienti.it/img/file/luridusimegizugo.pdfIn PDF document text
    • http://ddservice-bmw.pl/userfiles/file/64344696255.pdfIn PDF document text
    • http://aviteksural.ru/admin/ckfinder/userfiles/files/83910435132.pdfIn PDF document text
    • https://hiroyoung.com/data/files/sijegipezejonojoribo.pdfIn PDF document text
    • https://hinodecoder.com/userfiles/file/wulebarulumulafawijuxi.pdfIn PDF document text
    • https://n-v-v.dk/userfiles/file/xikojete.pdfIn PDF document text
    • http://omgmediatank.com/userfiles/files/nanigakomuwumud.pdfIn PDF document text
    • http://ministerium.pt/files/badoviva.pdfIn PDF document text
    • http://hkwwta.org/userfiles/fidinamobopal.pdfIn PDF document text
    • https://mmeasar.com/mmeasarfiles/file/surifived.pdfIn PDF document text
    • http://tuvanluatdanang.com/upload/ck/files/wixixu.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/3aec49ead105696a311fb3b667383be1/98606170773.pdfIn PDF document text
    • http://avtokapriz42.ru/userfiles/file/1738357964.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/2jk2uodhftkvi9r13p5f6mo9uu/58074624086.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_off0000ba40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA40 10640 bytes
SHA-256: 7bb4526ff9b1ed2db5fe9bc2088b201f38693a9aceff5551685a4fc9f338c9b7
font_01_sfnt_off0000d28b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD28B 15920 bytes
SHA-256: 2e1e05c5686b4713cbbf43e588e3632fa94fa6f072f9d51001c71e9ef44a4fe2
font_02_sfnt_off0000fb9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB9D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1