Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc60af5598fbfb5e…

MALICIOUS

PDF

68.2 KB Created: 2021-09-13 12:16:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: be1d7a30f498385bcc3ef4b1b6224bfb SHA-1: 4d6c9dc197f1c48e716fd18c6121f5a8781b4f16 SHA-256: bc60af5598fbfb5e99b6e3d542172e331a02e0a37f279a80ad8bc1d49f5edf50
156 Risk Score

Malware Insights

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

The ML classifier and ClamAV detection strongly indicate maliciousness. The PDF contains numerous links, many pointing to compromised WordPress sites or disposable hosting, characteristic of a link farm used for phishing or malware distribution. The presence of external URIs and link farm heuristics supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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 http://baozhaopharm.com/upload/files/95237934871.pdf In PDF document text
    • http://kaies.net/upfiles/file/rebekanipedamefopowipal.pdfIn PDF document text
    • https://nhabe.com.vn/ckfinder/userfiles/files/24672595657.pdfIn PDF document text
    • http://xn--aknmedical-yub.com/uploads/file/juvadalukok.pdfIn PDF document text
    • http://bdpq.hungminhits.com/files/uploaded/files/72735011869.pdfIn PDF document text
    • https://www.retake.dk/ckfinder/userfiles/files/48270709535.pdfIn PDF document text
    • https://dcicz.org/userfiles/file/debipu.pdfIn PDF document text
    • http://tg-focus.ru/userfiles/files/58934758954.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16138e49ebd536---guvuwatiroxomagituma.pdfIn PDF document text
    • https://xn--p3t29jo1ed4o4xw.tw/upload/files/29507254525.pdfIn PDF document text
    • http://clingac.com/d/files/10640721705.pdfIn PDF document text
    • https://equantumconsulting.com/files/files/59790662735.pdfIn PDF document text
    • http://digitalpolicycouncil.org/imagenes/file/69172295671.pdfIn PDF document text
    • http://labsshop.com/d/files/sibopapora.pdfIn PDF document text
    • http://egyptlance.com/userfiles/file/84870043400.pdfIn PDF document text
    • http://directartdeal.com/uploaded_files/userfiles/files/tezixal.pdfIn PDF document text
    • http://shtaket46.ru/page_edit/_samples/userfiles/files/70210910010.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/tl5n9s83suhe4g1tnrfg17gc3s/zudiwuzar.pdfIn PDF document text
    • http://climtech.com/files/files/9586039470.pdfIn PDF document text
    • https://lochoanggia.com/upload/files/limelenej.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d9ac76c241---61131260746.pdfIn PDF document text
    • http://wjcopy.com/upload/files/95378421589.pdfIn PDF document text
    • https://radio-aurea.eu/files/file/64035233176.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=hevc+player+apkPDF 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_off0000ad65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD65 15508 bytes
SHA-256: cd74eb1b9211c87444e3cf07d06935b1df9bc4cd7a5f0217ed777b2af5dc327c
font_01_sfnt_off0000d4ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ed03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED03 10048 bytes
SHA-256: 9f4d2c3534cc37554d0bd7d461d11ae788628bd43aa8470cc11f4a47f8a530ef