Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f0f3e084b7b9699…

MALICIOUS

PDF

87.0 KB Created: 2021-07-26 22:31:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7da51549efd4218425c09ee3fe0bbed9 SHA-1: 54e4e142075c79b6fafd132513701f47b454cdd0 SHA-256: 8f0f3e084b7b96993edfecb731889fd5b1eccb55c8b245508992ecfd095d5347
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to numerous external URLs, many hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of multiple links on disposable hosting and the use of UTM parameters suggest an attempt to obscure the true destination and evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://c-amc.com/upload/files/95773007819.pdf
    • http://kd-council.com/upfile/files/tumibelimoxigumo.pdf
    • http://zonwering-belgie.com/ckfinder/userfiles/files/26343026420.pdf
    • http://gagutp.com/sa_upload/userfiles/file/20210703201635.pdf
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/0q66nqsb9nr3g10ottco11ufeh/28834452161.pdf
    • http://www.chp.pl/ckfinder/userfiles/files/turuki.pdf
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/bdefc2a75ac95d9abc478901b270765c/93530424222.pdf
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608872d96ad55---zogawuzurowut.pdf
    • http://younewstoday.com/task/userimages/file/vilewurajajemunurufu.pdf
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b79ec10f11c---nefisuwi.pdf
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/2b34f4c00119b754596522c06648b337/82091591051.pdf
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f553ae9c120---34260395115.pdf
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/c422f02a7ab5e8778e0ca8ee8082940d/seput.pdf
    • https://pisangmanis.com/contents//files/87784534468.pdf
    • http://benetalent.com/upload/files/81420852768.pdf
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/fe69081f4985c2bb04cc6bb4b40953be/loboben.pdf
    • https://premium-house.uz/images/file/83567446069.pdf
    • http://agataklimowska.pl/userfiles/file/kejenapisusabi.pdf
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/jp9fe1jhcpgmclbvc63l77jtpi/winipevura.pdf
    • http://dralituncer.com/userfiles/file/rabixirozafaxewuredema.pdf
    • http://autohondl.cz/userfiles/file/39320543490.pdf
    • http://fundacionecla.org/resources/original/file/nejosajepoxepo.pdf
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/39e2adbb68b89624eaa5311ab5898322/15038842335.pdf
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc6dc2b64ba---faputibegejowi.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=dumbo+full+movie+in+tamil+download+tamilrockers
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000edee.bin
9573b8bfd648152c248d3b7ebe100f26a16ae1c9648cc8b932ffbfc32d7e20c2
pdf-font-stream PDF embedded font (sfnt) at offset 0xEDEE 11120 bytes
font_01_sfnt_off000107ea.bin
14858e27fca5c38bf80242f7a68e9c2134dab5b6ecc3981996248876fd133bf1
pdf-font-stream PDF embedded font (sfnt) at offset 0x107EA 17208 bytes
font_02_sfnt_off000134e6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x134E6 16792 bytes