Malicious PDF — malware analysis report

Static analysis result for SHA-256 a13192a019a262d5…

MALICIOUS

PDF

69.7 KB Created: 2021-09-06 01:50:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 035d8222f949bb964cefdfb75d32805b SHA-1: b6b4e4c37c5353018490d178efd04c442e5b4a9d SHA-256: a13192a019a262d5bb972e58da0741253b41a924e85d29079813dccf164c009c
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to websites hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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 http://caramelitos.sk/files/ruvonujelinini.pdf In PDF document text
    • http://medi-sen.com/files/files/tadalesuneluteladat.pdfIn PDF document text
    • http://goldenpeak.it/userfiles/files/kidifuxaxaguverosa.pdfIn PDF document text
    • http://grandinspirations.com/clients/75274/File/totawewenebi.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/1d2f5a4plc0ccj3ckq319jmnl1/zorejilexeduwex.pdfIn PDF document text
    • http://www.kilincsweb.hu/fileok/file/92507132248.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/ljfft0q1c35tb4tt8d7ebt8mg5/61051795840.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611b358d78814---42746489519.pdfIn PDF document text
    • https://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c30c556972c---zatifojevuberakabinel.pdfIn PDF document text
    • http://penzionklara.cz/userfiles/file/mapexu.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/629785553356e5a67a47af9e7951e4d8/67889484863.pdfIn PDF document text
    • http://ed-web.cz/userfilesfile/nofujuzifo.pdfIn PDF document text
    • https://ivanamihic.com//files/jokodosukaz.pdfIn PDF document text
    • https://mmagame.com/userfiles/file/90367804910.pdfIn PDF document text
    • https://muguet.fr/sites/default/files/file/xikevotanisedani.pdfIn PDF document text
    • http://lightningriskassessment.com/ci/userfiles/files/gazonugubirok.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609af895c7a79---wataf.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b51776bb8b6---85061541731.pdfIn PDF document text
    • http://maynenkhiinverter.com/media/ftp/file/28932448545.pdfIn PDF document text
    • http://uptindia.com/newsimages/file///34790038601.pdfIn PDF document text
    • https://easy2ticket.com/upload/files/5237249364.pdfIn PDF document text
    • https://viettrungson.com/media//Files/11623390254.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/41415349428.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608577f7b8d72---tifazenu.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/83712339458.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=printable+low+carb+food+list+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_off0000b3c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3C4 10840 bytes
SHA-256: 770d4ef24cb4b33880d657cc4fb8cc913bb05fcfe081ef3bb432eb50c38dff6b
font_01_sfnt_off0000ccbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCBD 14468 bytes
SHA-256: a754521e1ccc1ba31dae35a921f93c886b991404f5f95032fd4614df9425f732
font_02_sfnt_off0000f0ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1