Malicious PDF — malware analysis report

Static analysis result for SHA-256 f010cdfd6aabf3ac…

MALICIOUS

PDF

73.8 KB Created: 2021-09-10 05:22:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0d255697f4c8270d1aa4e36d3b3ecfe1 SHA-1: 6827f7e428a4f6f4a8d94cca0d5fa9bf306d7239 SHA-256: f010cdfd6aabf3acdc0fdfa844e65c1d61af4dbe7b76d6fe7b89e3440c9c63d0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

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 ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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=angry+birds+pop+2+apk PDF link annotation
    • https://fotoprint.lv/downloads/file/40828738085.pdfIn PDF document text
    • https://888nv.ru/userfiles/file/37982677270.pdfIn PDF document text
    • http://foreverymuslim.net/home1/forevev3/public_html/foreverymuslim/upload/file/7748591661.pdfIn PDF document text
    • http://casavacanzesanvito.eu/userfiles/files/mevituxiweregigezeximi.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16138913326616---rixinufiwakumaxinapi.pdfIn PDF document text
    • http://telecycling.info/files/file/46533849664.pdfIn PDF document text
    • http://checopharma.com/upload/files/lidoridunolebelebof.pdfIn PDF document text
    • https://nutritie-metabolism-sanatate.ro/app/webroot/files/userfiles/files/50463341452.pdfIn PDF document text
    • http://tobn56.com/UpFiles/file/jovedi.pdfIn PDF document text
    • http://ganteltechnology.com/system/userfiles/file/7857533235.pdfIn PDF document text
    • https://www.campacinter.com/image/upload/File/wuwevagivefamuwixiwube.pdfIn PDF document text
    • https://cribpointonline.org/cribpointonline/userimages/file/sabakakone.pdfIn PDF document text
    • http://sahrugs.com/userfiles/file/sudumuvenigipifumoke.pdfIn PDF document text
    • http://needychild.org/ckfinder/userfiles/files/28634215311.pdfIn PDF document text
    • http://ortopediaszombathely.hu/editor_up/jowusudi.pdfIn PDF document text
    • http://bjxbw.cn/userfiles/file/donezudunozabufimagodobi.pdfIn PDF document text
    • https://kristinanamaste.eu/files/59719162002.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16130436c8e228---jodezopimawemupotejak.pdfIn PDF document text
    • http://pyramidplaster.com/file_media/file_image/file/77801915571.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134611f80762---tofufaxoxetapixuf.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16133ed57a0928---39077394451.pdfIn PDF document text
    • http://termosystem.pl/userfiles/file/97977506813.pdfIn PDF document text
    • https://mygoaltv.org/ipp/images/uploads/files/15845533708.pdfIn PDF document text
    • https://doctmcooper.com/userfiles/files/83360857342.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/okis4egi1uah4o4nudpcnfm3io/besujukebibo.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_off0000bd9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD9F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d5b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5B1 17092 bytes
SHA-256: 8492f58526a77571ee6746c45225b4083aa3ab0b48c46e4b99c7247c46892c54
font_02_sfnt_off0001016c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1016C 10740 bytes
SHA-256: f2a751ccedf55f7f470bb778676ec11790d62354f44fd33d99e15b3c7ee6d24d

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