Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4024af7697bc3b8…

MALICIOUS

PDF

85.2 KB Created: 2021-06-30 08:15:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4b7382000ca442c11ce7ee87c537910d SHA-1: d7b3f5090868341d2da187dbbd71d1e37dd4d446 SHA-256: e4024af7697bc3b88c466731e3b46e734a2de79796c44e64f26f08e47c29cd1f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised WordPress sites. The presence of embedded URLs and the nature of the links suggest an attempt to lure users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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 http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e2d9059472---xatuveruvevijibobuzorusa.pdf
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c279d1c570b---gopizesa.pdf
    • https://stayatrosetta.com/wp-content/plugins/super-forms/uploads/php/files/77d4fs5lv13c5fa2tot2to3kkg/wezojogu.pdf
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076f73f42653---molunifipo.pdf
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/11c9832271a4fe022c4875fad75654cd/52769768412.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098b7e142f52---regitijowisulap.pdf
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/eb8kgljih6kdidggg08p2tikr0/vasamofisaded.pdf
    • https://abofahed.com/userfiles/file/69402121325.pdf
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/1da372eb204d680d22b2b7ff27f30fc0/rimezovaralamof.pdf
    • http://stolizstekla.ru/userfiles/file/josewonedivefavud.pdf
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/bb2a76kdnj3u5tfffe5rckt5qd/nerepelalegiwuwesosavasap.pdf
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/e0t15ubobtanl6ruklt6d6t292/pusobafip.pdf
    • https://isleo.com/i_photos/file/bepudizipexuj.pdf
    • http://palazzodiaz.com/userfiles/files/3550703013.pdf
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/gupuxakoro.pdf
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/fded3366a2b909a429d912593160e710/12181172599.pdf
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608bf31a2379b---fulan.pdf
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3d3c37cfdc---34121907962.pdf
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/ba26e4f2b95916d1372759c00ff5e4bf/kezomuzij.pdf
    • http://zabradli-znerezu.cz/userfiles/file/22176276115.pdf
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/tu28ctllfmco6crimpn5th4i5t/pasupijef.pdf
    • http://www.buildingmalawi.com/images/uploaded/documents/duxetujajum.pdf
    • http://shreejians.com/userfiles/file/36434045070.pdf
    • http://arcomproltd.com/userfiles/file/28717833894.pdf
    • https://pointvirgule.ca/upload/editor/file/31723603971.pdf
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/23e786e089887fec01acef843f978e2f/wasixesesimadalanunigeb.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=powerpoint+text+curve
    • 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_off0000e825.bin
4498ad809012d4fcfe6e3e3e98cb7b5698b240b13f47f762c4b9b7269b68e986
pdf-font-stream PDF embedded font (sfnt) at offset 0xE825 10344 bytes
font_01_sfnt_off0000ffae.bin
f177b512da681b007e586a699876f09f14995a45b532a0f36172136b7697e23a
pdf-font-stream PDF embedded font (sfnt) at offset 0xFFAE 19024 bytes
font_02_sfnt_off00012f8e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12F8E 16792 bytes