Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0698f155fdc7ad9…

MALICIOUS

PDF

76.5 KB Created: 2021-09-03 07:34:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6937f94473554784bfae7f2c93fcfe8f SHA-1: 63c16bcf569635a4393167ed0352bca2f11833ad SHA-256: d0698f155fdc7ad94632a19b0085157d398d07a0e9d4d8dbd8f2e54055913726
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of multiple external URIs and link farm heuristics confirms the primary attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://coretry.ru/uplcv?utm_term=energy+environment+and+sustainable+development+pdf PDF link annotation
    • https://vestol.bg/files/file/dokerixotilusewus.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b140d3b7dac---1376403862.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/9i411k2t78dal8lh9siq00vp95/fofikomivamunotepafen.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/161140f1788809---58808228463.pdfIn PDF document text
    • http://remont-elektro.eu/archiv/file/fevomilimibidovog.pdfIn PDF document text
    • https://stef-nancy.fr/upload/document/4588204063.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160925ae491c4e---5876976542.pdfIn PDF document text
    • http://uleshuzatshop.hu/files/file/47601544843.pdfIn PDF document text
    • http://brette-animation.com/userfiles/file/33398188079.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ecace12f575---relusumijuno.pdfIn PDF document text
    • https://drrajanmahtani.com/userfiles/files/58193124384.pdfIn PDF document text
    • http://watthaistuttgart.de/userfiles/file/47628909633.pdfIn PDF document text
    • https://realschoolspirit.net/scauserfiles/files/zabemaxakananunirepiwow.pdfIn PDF document text
    • http://studiobaldizzone.com/userfiles/files/taravabopese.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c0cd482473f---52530570489.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/3c728a41e220fd86e852bbeb331e32d2/jofuge.pdfIn PDF document text
    • http://skpizzasubs.com/uploads/files/93489071307.pdfIn PDF document text
    • https://www.cylinder96.ru/admin/ckfinder/userfiles/files/fowakolulovuravenupipuka.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/16103bed01e57a---pinam.pdfIn PDF document text
    • https://nanosoft.mn/images/content/File/87491292553.pdfIn PDF document text
    • https://angelsstaff.com/uploads/file/dejaziraw.pdfIn PDF document text
    • http://qtjdb.com/UploadFile/2021/05/18/file/20210518_061915_186.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/16830295739.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6f72acbad---tetasofiguli.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/a6cd2c80697f9e7d83c46228a348f209/xugilanakawu.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/61f54b3766bc1a33f5674c7dcec4de8a/xirusufesomokobo.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_off0000c793.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC793 16424 bytes
SHA-256: 62e9bb1f35841dfc1c538b13991126a5e441ccd25a6c0d8a7b605ef5392d75f0
font_01_sfnt_off0000f1cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1CF 11244 bytes
SHA-256: 33cd4f3d92f360281785c7983078135babdbf87bd8599c537f83e8ea07993766
font_02_sfnt_off00010bc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BC1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1