Malicious PDF — malware analysis report

Static analysis result for SHA-256 19e0a55464f74d2a…

MALICIOUS

PDF

70.5 KB Created: 2021-09-26 21:04:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 133fea3c7e5c149f071a0c329b3915a5 SHA-1: 43650bce3d43d949c4420a9c0814a0582c0237c1 SHA-256: 19e0a55464f74d2a94f48e91a125f92691d2a90be6c4f0f9ae68da70cb8e4b7a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many pointing to compromised WordPress uploads or disposable hosting, indicating a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or SEO spam. No scripts were extracted, but the structure and URL patterns are indicative of malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://krisoc.ru/uplcv?utm_term=things+to+do+with+redstone+in+minecraft PDF link annotation
    • https://kluchar.net/klucharnet/images/file/65653912234.pdfIn PDF document text
    • http://blackivy.pl/userfiles/file/46122469761.pdfIn PDF document text
    • http://ubytovani-budejovice.cz/picture/vtextu/file/79232482491.pdfIn PDF document text
    • http://naplesredeals.com/userfiles/files/duxiketumabopekanivides.pdfIn PDF document text
    • https://gym-rectif.fr/ckfinder/userfiles/files/vigobefoluwobatojiwowoja.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161397b30d2067---32231252428.pdfIn PDF document text
    • http://sowaprojekt.pl/files/file/87443689176.pdfIn PDF document text
    • https://digicpictures.com/downloads/92377768866.pdfIn PDF document text
    • https://skatrip.com/basefile/skatripcom/files/velunexukoxixaxuvid.pdfIn PDF document text
    • http://restravel.ru/ckfinder/userfiles/files/66186212114.pdfIn PDF document text
    • http://buydecor.ru/uploads/files/sadosaverefi.pdfIn PDF document text
    • https://sabunwangi.com/contents/files/14232966755.pdfIn PDF document text
    • http://canxetaidientu.com/images/file/jepabosaluminobapovem.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/0009d34ffc55bfd2de05edd39c8dc65e/95869449601.pdfIn PDF document text
    • http://www.prieteniitehnicii.ro/documente/file/34222258091.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/26qic42gd3cl2upt3c6sjhu54k/xitoxivarexoxudule.pdfIn PDF document text
    • http://tipiland.net/upload/file/xuwavupib.pdfIn PDF document text
    • https://jokerprod.net/userfiles/file/xezujaboxaxiwefilaruwoj.pdfIn PDF document text
    • http://personal.sut.ac.th/chantira/port/ckfinder/userfiles/files/34396269294.pdfIn PDF document text
    • http://churchontherockuk.org/home/churchontherock1/public_html/userfiles/files/63628521392.pdfIn PDF document text
    • http://cnsgawefgl.netsociality.com/upload/files/kanajakaputawewil.pdfIn PDF document text
    • https://www.premiumtrade.ro/ckfinder/userfiles/files/34298404186.pdfIn PDF document text
    • http://asbazainville.org/userfiles/file/forojoparawemarigidinubiw.pdfIn PDF document text
    • https://keongracun.org/contents/files/67314120421.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_off0000afbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFBC 16132 bytes
SHA-256: bd7f0c7c76afe8af876638ed23f89b3f4d6228cf315e97d69a0016ec63b131f0
font_01_sfnt_off0000d94a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD94A 10928 bytes
SHA-256: 3b05fbd7c471e7fd406cdab7a6794ce32ea2330e8f4f078f65aee0deef6172a9
font_02_sfnt_off0000f24f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF24F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1