Malicious PDF — malware analysis report

Static analysis result for SHA-256 03e25a9607e64f6e…

MALICIOUS

PDF

72.0 KB Created: 2021-09-18 10:00:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: b7566fd063eab2eda8372eb83346415d SHA-1: 0d17227525f03237ed5933beedf1a1e93c7a9b23 SHA-256: 03e25a9607e64f6e51ad8497a6b51d687cdecc8958d345772fa06edbef68bb41
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically identified as a phishing trojan. Numerous embedded URLs point to compromised WordPress sites and other domains, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure and URL analysis strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://crysiq.ru/uplcv?utm_term=ludo+king+ad+free+apk PDF link annotation
    • http://keitbg.com/images/files/17065879096.pdfIn PDF document text
    • https://die-elke.de/cms/elke_page_files/file/52380948996.pdfIn PDF document text
    • http://kraemer-duennebacke.de/files/file/botukekelezifetudipik.pdfIn PDF document text
    • http://turskazka.ru/ckfinder/userfiles/files/kefipa.pdfIn PDF document text
    • http://bancasemecanino.com/userfiles/files/5553488218.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/892518b0f84fd175e6c96292621a6590/31182284887.pdfIn PDF document text
    • http://cachnhietcacham.vn/Images_upload/files/3412474574.pdfIn PDF document text
    • https://www.weboonline.com/ckfinder/userfiles/files/tovum.pdfIn PDF document text
    • http://ooexperience.be/assets/Image/files/45569487391.pdfIn PDF document text
    • https://chambres-lannion.fr/userfiles/file/18175068109.pdfIn PDF document text
    • http://mkpstroitel.ru/upload/files/nubewanupotasexatuze.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/16143af046d093---pefoj.pdfIn PDF document text
    • http://drxzhang.com/userfiles/file/43949492545.pdfIn PDF document text
    • http://vswet.ru/f/57648517465.pdfIn PDF document text
    • http://tygodnikzuzlowy.pl/ckfinder/userfiles/files/fefuwiwufebefu.pdfIn PDF document text
    • http://zhongguohuachun.com/d/files/ponokexokamotebid.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1613a25a1a117c---mewazivo.pdfIn PDF document text
    • https://successalpha.team/upload/files/97774609985.pdfIn PDF document text
    • https://cafepiolho.com/uploads/assets/69066795178.pdfIn PDF document text
    • http://sntaviator.ru/ckfinder/userfiles/files/bagezibunorune.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614345b00cf6a---51601327189.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f3aa150b9e---fadowixezin.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_off0000b95d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB95D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d174.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD174 10508 bytes
SHA-256: e5869f623f969624db899eb1033436c376918cf1b13967228e02ac9d326be21f
font_02_sfnt_off0000e936.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE936 16012 bytes
SHA-256: 1af4df960a06e81cd68696ab2618b37bd4aafda1fc0329cdb0d36dba576e86b5