Malicious PDF — malware analysis report

Static analysis result for SHA-256 da8575d70f5993b6…

MALICIOUS

PDF

73.8 KB Created: 2021-09-01 16:24:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 22bcdf41e4a6f53a52ecb00d754d0cd5 SHA-1: 74d5660b061ec3e29880f05a7cbc326dd3a9ce8a SHA-256: da8575d70f5993b69229cf4f5e331d5bfb44c8cf86f4bc3e398453c29253e94a
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised websites or disposable domains, indicating a link farm designed to lure users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://www.sas.edu.mn/ckfinder/userfiles/files/molexexaker.pdf In PDF document text
    • https://aspaeng.com/files/image/files/sejezelan.pdfIn PDF document text
    • https://sanidom.pl/img/file/72241208631.pdfIn PDF document text
    • http://hiniceshine.com/upload/92786605210.pdfIn PDF document text
    • https://travelinnsuites.com/nbloom/fckuploads/file/lusuvefenixofolapitafele.pdfIn PDF document text
    • https://asiapharma.la/files/files/nomevofeveganerubop.pdfIn PDF document text
    • http://otohondamientay.com/upload/files/galazur.pdfIn PDF document text
    • http://thedreams.cz/files/zasurixo.pdfIn PDF document text
    • http://studiotecnicoforace.eu/userfiles/files/duzabaneni.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160acd001d935d---jakovikap.pdfIn PDF document text
    • https://delaneyllc.com/ckfinder/userfiles/files/tirako.pdfIn PDF document text
    • https://qqhanoman.com/contents//files/23048588401.pdfIn PDF document text
    • http://oiseau-bleu-morzine.com/userfiles/file/babuvanefajoxulax.pdfIn PDF document text
    • https://csmgh.net/pevron/www/img/file/fosuwubajere.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021070319434437.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160ae28865334d---49940023074.pdfIn PDF document text
    • http://wellogo.in/userfiles/file///93874630058.pdfIn PDF document text
    • http://marjoleintje.nl/include/userfiles/92889204063.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607a148f91f36---3858717664.pdfIn PDF document text
    • http://elite-nails.pl/Upload/file/bepixodunobupoduzekapu.pdfIn PDF document text
    • https://bliznacite.com/files/80666416457.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/shmrrfjddh12msrrl550p9taeo/narigigatumewomebo.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160887fd304ab4---foveviwi.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085f1c38fa5e---ruxorokexipovikinezalezi.pdfIn PDF document text
    • http://skogsformedling.se/bilder_umeny/File/pomebufed.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=learnt+vs+learned+meaningPDF 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_off0000be59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE59 16456 bytes
SHA-256: 8e3f853d97fc3f42b39d4ad51338e40acd192ffab2099a7839bb61eb68693b82
font_01_sfnt_off0000e876.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE876 10492 bytes
SHA-256: dcbe553990ff1f3ea382f568dbe85cbd6ab21aaf0261d2f1b62a0592751b8d1a
font_02_sfnt_off0001000f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1000F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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