Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ee1399d8da3cd55…

MALICIOUS

PDF

80.7 KB Created: 2021-09-02 06:20:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4f4930ba88316a913b09e5d29fb6c1d0 SHA-1: 0ca0a602eb8799c1b1e1f8533c2676a2d6a1f35b SHA-256: 8ee1399d8da3cd55384b83e73fa2e7cf2fff3b463abf8e150749d0ccc7fdfb9d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution lure. The ML classifier and ClamAV detection strongly indicate malicious intent. The file's structure and link farm behavior are consistent with a phishing campaign designed to redirect users to malicious content.

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 http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc72e8dcb0f---87931675479.pdf In PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/5uojhb30s3vst79os6ints1fr1/wazelogig.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/48usf4f2k395q4ppla9hl4nltb/27163785510.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/subudixa.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/264184a2b6bc6b5bc66aa245b11443df/62278295654.pdfIn PDF document text
    • https://acronimocostanzo.com/userfiles/file/xoredakalakuxugelaxemajub.pdfIn PDF document text
    • https://ubitanduk.com/contents//files/59169140477.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/bcdd2a096b57dc78167a27cde582a1bd/korosefaposenazuza.pdfIn PDF document text
    • https://cristalparkhotel.com.ve/ckfinder/userfiles/files/56132077001.pdfIn PDF document text
    • https://liur-krd.ru/userfiles/file/96129294963.pdfIn PDF document text
    • http://xn----8sbaqfskngn1qi.xn--p1ai/userfiles/file/70874342171.pdfIn PDF document text
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1606cef4899b43---97219880712.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/54e76f64f7153b0d904d8167481eeea3/kusuzixolakesij.pdfIn PDF document text
    • http://videofilm-tv.ru/content/File/xabemujodile.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/qfevnamtah31vb70nh8ar1nrrt/46152950350.pdfIn PDF document text
    • http://familiehollander.nl/images/uploadedimages/file/89923169479.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/85398a69697e2b0a5d8c60d6daff5c86/wituzifezobe.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c141114c4fb---27984208398.pdfIn PDF document text
    • http://musicpark-live.de/userfiles/file/nekaligirunufatemoxokufo.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/202166129438978.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd64c95706---37891305976.pdfIn PDF document text
    • http://alexanderkanevskyartistbiography.com/clientMedia/file/87392198316.pdfIn PDF document text
    • http://biancoacolori.it/userfiles/files/27058459841.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=changing+a+well+pressure+switchPDF 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_off0000d6b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6B5 17900 bytes
SHA-256: 576c7cb0d561b7a23142efc39cf23d509d7261fceeafaaa0889d471bff282610
font_01_sfnt_off000104f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D09 10748 bytes
SHA-256: e43f71e6f980fc4e0d1a901f956d04f59a7bd205a5466126879f1db24c64258e