Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5aafd02741b0c42…

MALICIOUS

PDF

84.2 KB Created: 2021-09-21 14:31:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b082b49ad4c5ec8c052f30a73e1e5dbf SHA-1: 3d349117436d53fe89f331614264a43c8c288120 SHA-256: f5aafd02741b0c42191cf77edfcc96a931dae6c35d551dcb07e9b67b069e2f5d
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics as a link farm, with several URLs pointing to compromised CMS upload directories. The ML classifier and ClamAV also identified it as malicious. The file's structure and the nature of the extracted URLs suggest it is designed to lure users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://franciscovalles.comtraining.cl/userfiles/files/kokagisuxapegokuru.pdf In PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/161436d5ac8116---60104129718.pdfIn PDF document text
    • http://homeopathyhongkong.org/files/sovimak.pdfIn PDF document text
    • http://pointerboards.com/uploads/admin/files/44331573309.pdfIn PDF document text
    • http://gabinetpro.gabinetpro.pl/kosmetyczka/krakow/files/38778704278.pdfIn PDF document text
    • https://apotekatia.ba/fajlovi/xugix.pdfIn PDF document text
    • https://www.jdconstinc.com/ckfinder/userfiles/files/23653221389.pdfIn PDF document text
    • https://zerling.eu/nico/images/files/zugut.pdfIn PDF document text
    • https://tumujerrusa.com/userfiles/gopifad.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/xokivegowesuwanobawu.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/ac3c03d3cf961771060dc6cccddcbc98/18568891285.pdfIn PDF document text
    • http://jianianhuayule.a9188.com/upload_files/art_files/files/20210902_134205.pdfIn PDF document text
    • http://ddaengshop.com/ckupload/files/19912545974.pdfIn PDF document text
    • https://haltia.mx/sii/ckfinder/userfiles/files/wuronabupirutaxemije.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/e6a174ab5f0ab7ed9c261df6d36352a4/ropisuvof.pdfIn PDF document text
    • http://rfaaa.com/UploadFile/file/20210903181738605.pdfIn PDF document text
    • http://knupress.com/pds/editor/file/xujemaxojunulopalajuf.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/d6f883012115aa94fc09ecffad84aa4b/1906272300.pdfIn PDF document text
    • https://shen-su.eu/gfx/userfiles/files/zarafemebuzewimuliru.pdfIn PDF document text
    • http://joyandwowbook.com/upload/file/94691004767.pdfIn PDF document text
    • https://www.douggoodkin.com/admin/ckfinder/userfiles/files/teboxa.pdfIn PDF document text
    • http://mauthietkedep.info/upload/files/99677001505.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/d19c844277607bccf710f0f1b9004053/fesenufuvujenebarowalem.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=moto+c+plus+updatePDF 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_off0000dbdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBDC 10304 bytes
SHA-256: 2fdc01c401a5b8596a8819ce6a6b6e4938b08bddaaa855f8c18a58085163a065
font_01_sfnt_off0000f34a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF34A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B5C 21040 bytes
SHA-256: 84c5bd38eefd08de8451ba6cb15cec9a11ed31d450428ff1a324c0722ee44f63