Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f65788abfe33346…

MALICIOUS

PDF

91.0 KB Created: 2021-09-04 07:24:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 3a9a96c8a14d69bc35320fed39d51509 SHA-1: 4f90381d1554e0b8b5303c2656bb7c2b7ab2ed6e SHA-256: 3f65788abfe333466bd22f30742bae3400831d195374cf926d2e091b9257dc25
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed to distribute further malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure of the PDF itself is the primary attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/7kl6i8v1t3rmljah0j71f8adc4/mexewosoluno.pdf In PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093f343d5f45---32480826607.pdfIn PDF document text
    • https://www.hmgfinance.com/ckfinder/userfiles/files/10557890188.pdfIn PDF document text
    • http://dlzhrjd.com/images/uploadfile/files/punapixekuram.pdfIn PDF document text
    • https://derechosenred.org/aym_image/files/kutigo.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608a76cbd38b2---gofatosewofewelevutavufet.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e06f886fe95---vidukilawevelufobemoje.pdfIn PDF document text
    • https://hepiran.com/cache/fck_files/file/62816645454.pdfIn PDF document text
    • http://grandinspirations.com/clients/75274/File/48199515584.pdfIn PDF document text
    • http://ainut.fi/userfiles/file/71965956049.pdfIn PDF document text
    • http://nessium.fr/userfiles/file/81204642630.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/16082adde2a945---vuvosolabikedopis.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/2e9e1dffbc74617b00c77bff67f8588c/dufawuvitewuvud.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160943be74419c---bavifawikutoxakuwe.pdfIn PDF document text
    • http://fantalife.nl/userfiles/file/kabekefozorunizoporeg.pdfIn PDF document text
    • http://newdimension.su/userfiles/file/26676553671.pdfIn PDF document text
    • http://shangrilayunnan.com/ckfinder/userfiles/files/20619204295.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca6f3ab769---kavimuja.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/16097dea297ce1---ladibewimevexefi.pdfIn PDF document text
    • https://radekslodkiewicz.pl/files/file/21581274756.pdfIn PDF document text
    • http://boxerdapolenta.com/cmsimple/images/file/62249320037.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/2f940cec4b0c10e0f00991cd74f861cb/14357200697.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=titanic+flute+notes+pdfPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/61ad0f83443cedf6b36e45345d3a8e81/sadogubowo.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_off0000f511.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF511 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010d23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D23 21708 bytes
SHA-256: fb6f03fb66eb83339d0dbb5197289fecbcd65cb48710c64e4eb97506c89f28aa
font_02_sfnt_off0001466e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1466E 10576 bytes
SHA-256: e3b36fd885e137b30f57163bf2dcaed8c399b67b9c1565f25d1f44f1e1176115