Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0e33d284302a6c1…

MALICIOUS

PDF

82.3 KB Created: 2021-09-30 17:44:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 5de2dd53e7eac60b5d11668b3644bc44 SHA-1: c35af47ce5b96ca42982e088f70e3d659af387a7 SHA-256: f0e33d284302a6c19113e274079d6f205251c99fde62f3d95eae58dfeaff55c7
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains a link farm pointing to compromised WordPress upload storage, suggesting an attempt to host malicious content or redirect users. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/0bbabf81b5aa923d73ac3155759811a0/sasotevalos.pdf In PDF document text
    • https://radekslodkiewicz.pl/files/file/62221075316.pdfIn PDF document text
    • http://gpsputhuppally.com/userfiles/file/41474052801.pdfIn PDF document text
    • https://angem.fr/userfiles/file/4353639621.pdfIn PDF document text
    • https://breedlife.com/upload/files/26014296745.pdfIn PDF document text
    • https://houstoncoinclub.org/FCKeditor/file/2236589901.pdfIn PDF document text
    • http://kutscher-customs.de/gfx/userfiles/files/27775138671.pdfIn PDF document text
    • http://netflor.pl/upload/File/tozelifanututipe.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1613ca1a37f744---xowebili.pdfIn PDF document text
    • http://atrsara.ir/resource/files/zejevab.pdfIn PDF document text
    • http://slovbau.sk/test/userfiles/file/61900019675.pdfIn PDF document text
    • http://studioassociatoemc.com/userfiles/files/65058522466.pdfIn PDF document text
    • http://rheinmotel.com/userfiles/file/89567488914.pdfIn PDF document text
    • http://9262895.ru/ckfinder/userfiles/files/nowurovebagozoni.pdfIn PDF document text
    • https://reformedgeneration.com/userfiles/file/fotamotojupolazugozokabo.pdfIn PDF document text
    • http://lmleadmanagement.com/userfiles/files/mefibilam.pdfIn PDF document text
    • http://biaikatolikus.hu/files/file/xozemiroros.pdfIn PDF document text
    • https://geniodelweb.com/file/venukoladebadajuziti.pdfIn PDF document text
    • http://ipublicity.cz/data/file/mijiwubezigigafewotivito.pdfIn PDF document text
    • https://gastriklandsbf.se/UserFiles/files/sididilom.pdfIn PDF document text
    • http://daearesort.com/FileData/ckfinder/files/20210928_51199A8F70DBBB7B.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/b150e5e23ffebf8a8caae86981ac8ee2/62045975320.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=iphone+contacten+overzetten+androidPDF 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_off0000e076.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE076 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f88d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF88D 10476 bytes
SHA-256: b4c7b45384dbbb78e8342db64eef27e2e3c9302bb7bb17720ccfdb0deb14aae8
font_02_sfnt_off00011054.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11054 16904 bytes
SHA-256: 346bd09299172e4d2077cc9be7ae3f8ee0e6b5872d63e3a826400d315ef5ab45