Malicious PDF — malware analysis report

Static analysis result for SHA-256 e195a047936028fc…

MALICIOUS

PDF

82.3 KB Created: 2021-09-18 22:25:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8fa375904a59ed4f43867a65249e0b69 SHA-1: 0c29a31dafb6d905b5aba6c5a03b93158b01fad4 SHA-256: e195a047936028fcdc70171e3a77600cfd300de15908195389bc57f7382fb215
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The PDF's structure and the presence of external links strongly indicate a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://philabc.ru/uplcv?utm_term=solve+x+calculator+with+steps PDF link annotation
    • https://rijst.nu/userfiles/file/23450461119.pdfIn PDF document text
    • http://www.rannatennis.ee/data/upfiles/files/vijikizexukidavezukuzad.pdfIn PDF document text
    • https://ukmalayalamnews.com/userfiles/file/mosubom.pdfIn PDF document text
    • http://espressobuilders.com/app/webroot/files/userfiles/files/potev.pdfIn PDF document text
    • http://spadhotel.com/basefile/spadhotelcom/files/69061775075.pdfIn PDF document text
    • http://telegid.tv/userfiles/file/67522748901.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131acb2c63eb---vulutikupew.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138c30e51bc1---datop.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/955264ccb5fa1f33da4f68fc96fbbffb/zesitarozotodisudizovuwu.pdfIn PDF document text
    • https://www.barrau-philippe-sedeco.fr/ckfinder/userfiles/files/28796608437.pdfIn PDF document text
    • http://gachtrangtritranvinhtin.com/gachtrangtritranvinhtin/Images_upload/files/50664662897.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/161449f181cd5f---66030301241.pdfIn PDF document text
    • http://prestinoequitacion.com/imagenes/upload/files/tinegilezemamepuluwu.pdfIn PDF document text
    • http://yongchengtech.com/uploads/files/202109180122554737.pdfIn PDF document text
    • http://vinhthuan.com/upload/files/34456671817.pdfIn PDF document text
    • https://thefertilizerproductionline.com/d/files/lujagagavux.pdfIn PDF document text
    • http://conomiya.com/images/uploadedimages/file/45936304178.pdfIn PDF document text
    • http://wxmx.cn/upload/ckimg/files/202109020357569294.pdfIn PDF document text
    • http://rklatex.com/userfiles/file/60302023680.pdfIn PDF document text
    • https://tennis-samara.ru/img/file/25138979980.pdfIn PDF document text
    • http://greenearthgardens.org/userfiles/veseke.pdfIn PDF document text
    • http://asid.rw/userfiles/file/86325014375.pdfIn PDF document text
    • http://elektrostroy.kz/ckfinder/userfiles/files/70051217929.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_off0000d6e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eefa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEFA 10796 bytes
SHA-256: 0ee163f7812e4b4b4544908966192373c284d288af1705f4f5baf1d7510a83e4
font_02_sfnt_off00010812.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10812 19632 bytes
SHA-256: a311c5a404ee266ea2d445661d64adc152bc12cb824af35cc6825e3220084b0e