Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8cb6a199ecda4ee…

MALICIOUS

PDF

87.1 KB Created: 2021-09-04 21:38:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ad19c9b9d96c58bbf2a9fe23c7cf4c1b SHA-1: 07773703837e1b24feb2c426d091456ac3a93a77 SHA-256: e8cb6a199ecda4ee7ea1e158aa4ec87aaa7adc96a887314e197f9927b09a5147
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which are associated with compromised CMS uploads or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://garglob.ru/uplcv?utm_term=reutilizar+definicion+pdf PDF link annotation
    • http://mobilesamara.com/img/files/file/6967535852.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/16082ac2ea1292---genasofesoxepi.pdfIn PDF document text
    • https://santaclara.com/wysiwygfiles/file/2989500810.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607980e032679---radakirilefejuvakurani.pdfIn PDF document text
    • http://lightningriskassessment.com/ci/userfiles/files/82955055716.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/77585072459.pdfIn PDF document text
    • http://sinostandards.net/upload/files/peluta.pdfIn PDF document text
    • https://xn--faade-mtal-p6a3a.ch/ckfinder/userfiles/files/60112238605.pdfIn PDF document text
    • https://tanasiri.com/piceditor/file/tafipodaxokuv.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160887000d0af2---52642908735.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/722b3fcca078e3d431c7e26fad9e8cb1/92888137748.pdfIn PDF document text
    • http://www.colormotion.cz/UserFiles/file/niwugabavasad.pdfIn PDF document text
    • http://osstemcardiotec.com/files/fckeditor/file/202498008560f84101b4c3c.pdfIn PDF document text
    • http://fullcolorspandoeken.nl/userfiles/file/26245564835.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607573dd7e812---zemozor.pdfIn PDF document text
    • http://elistaprezentow.pl/userfiles/file/rurotufagejinaretadoburi.pdfIn PDF document text
    • http://infunplastic.com/d/files/zamarezolidiruvepumi.pdfIn PDF document text
    • http://re-view.online/fckFiles/file/79202247695.pdfIn PDF document text
    • https://wrd13.com/force/file/pumozufejidotunelebe.pdfIn PDF document text
    • http://ndt-tl.ru/upload/file/budexisilamaledes.pdfIn PDF document text
    • http://dhsclassof70.com/clients/d/d1/d13f49183e6b2ef720c1f353b43de0f2/File/divemoj.pdfIn PDF document text
    • http://bona-agra.pl/Upload/file/jifijexomevisujupepoburev.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_off0000ecec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECEC 10648 bytes
SHA-256: b6e37caac59f180b9c9134bb2224b4d67cfd51ea5f3218240e1f06efff22c474
font_01_sfnt_off0001056a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1056A 18484 bytes
SHA-256: 80f51cee2b066debe1325272db266b4a29175eabdaf73631e5f3ab06ec1c4608
font_02_sfnt_off000134e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1