Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bf13c9ddf71a27d…

MALICIOUS

PDF

72.6 KB Created: 2021-09-04 13:20:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c8954de732b08d26135ccc3cde2bb7a7 SHA-1: 2a6325f794062cfe72ad22c91338df18bba46251 SHA-256: 1bf13c9ddf71a27dd7d42d5c7f0c52675418d2584d0598464af9349abdc06837
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning model as malicious, with ClamAV identifying it as a phishing trojan. The document functions as a link farm, containing numerous embedded URLs that point to compromised websites, many of which are WordPress installations. These links likely lead to further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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=science+form+3+chapter+7+pdf PDF link annotation
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/lh7524o6b4615ps8hhvlfvtkfo/xafeduxudimatedonasugima.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/dc39911d53676efda8cdaf1737a7afa6/nusojusomesa.pdfIn PDF document text
    • http://www.leasebridge.com/CKUPimg/files/97270971436.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606f39efdd963---bogaxi.pdfIn PDF document text
    • https://bibliothequedesarts.ch/ckfinder/userfiles/files/mosemuwogipipidaj.pdfIn PDF document text
    • http://cascinamana.it/userfiles/file/1296189949.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607c719dad7b7---6709521721.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/959888764326c492a9c6e7fe70a1be32/doponenerax.pdfIn PDF document text
    • http://sahrugs.com/userfiles/file/lonoloxoxozi.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/iisgo900vageqmmrse17nnqmp2/19119435269.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6b4709c6a7---bavuraladafifolul.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bc11d95e1fc---difel.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/e8901c97561e760f53c93e2b7e73757e/25330658354.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/e17ec81cddaf44b0db1faeca4c75823a/92519473705.pdfIn PDF document text
    • http://fruitvita.com/files/files/59327850514.pdfIn PDF document text
    • http://soluzionebenessere.eu/userfiles/files/36690056084.pdfIn PDF document text
    • http://narcisse.sk/editor_uploads/files/27485449523.pdfIn PDF document text
    • http://avrig35.ro/uploads/fck_editor/file/lanusesa.pdfIn PDF document text
    • https://leo-translate.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1607c4255b34f9---23276429091.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/vqv5gu6plubkjg7cv213lodt75/98390544281.pdfIn PDF document text
    • http://monkeytailranchdonation.org/clients/e/e8/e82116dd0b5861b0917add2a69208af2/File/62258925955.pdfIn PDF document text
    • http://htwy.com/upload/file/ganeremudevejepuresewowuk.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_off0000ba1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA1D 10968 bytes
SHA-256: f075f6b8c3db14b70f5795bacf6a6592803e9521869e05e2a3aa636bfcfcf6da
font_01_sfnt_off0000d373.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD373 16428 bytes
SHA-256: 1ef4d11693203d43ff430243f22716a90ab4f6d8061d3e2d870c29616fc22665
font_02_sfnt_off0000fd1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD1C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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