Malicious PDF — malware analysis report

Static analysis result for SHA-256 698ed39434bcbef1…

MALICIOUS

PDF

81.8 KB Created: 2021-09-10 04:21:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: cb926a7ba2e214e4a76e89d867ab3064 SHA-1: dad7a904e05f238312a672c69d2270e5ebb8c882 SHA-256: 698ed39434bcbef1a87d7b2234ec4e205d79b74d019d1052ea5435da4472ead5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm pointing to numerous external URLs, with several hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the embedded URLs and heuristic findings suggest the document's purpose is to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://youandisagenix.com/ckfinder/userfiles/files/74906869222.pdf In PDF document text
    • http://canyonmeadows.org/userimages/lokobez.pdfIn PDF document text
    • http://bielle-srl.com/userfiles/files/kopeselusomof.pdfIn PDF document text
    • https://dialogueinpraxis.net/files/docs/rasubaximak.pdfIn PDF document text
    • http://smenergy.kr/uploaded/file/179066678612f0c778ed69.pdfIn PDF document text
    • http://huichem.com/ckfinder/userfiles/files/94738941698.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/0f6328c60b68ed15ea1dd53ddb4aa8a6/10684659540.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16136aaf488d82---sifuzogopo.pdfIn PDF document text
    • http://trevorhannant.com/18192255686.pdfIn PDF document text
    • https://xn--p3t29jo1ed4o4xw.tw/upload/files/23656940764.pdfIn PDF document text
    • https://studyhalltracker.com/files/file/rugifefurivupabekowutanoj.pdfIn PDF document text
    • http://gearcon-eng.com/file_media/file_image/file/belebesa.pdfIn PDF document text
    • http://vividconcept.in/userfiles/file/febiseronijutupaw.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1613173c874a07---77467797175.pdfIn PDF document text
    • http://word.mn/uploads/assets/93652115750.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/0mfu4ea7m5o60o3oossemk82q6/kazudex.pdfIn PDF document text
    • http://qlionshousing.ca/userfiles/file/terodidasivek.pdfIn PDF document text
    • http://polskienarty.pl/data/aktualnosci_imgs/file/77264474030.pdfIn PDF document text
    • http://www.civilhospitalpalampur.in/img/uploads/files/mebikanutajapupe.pdfIn PDF document text
    • http://tehla.eu/userfiles/file/vojoxagefelelepafisujobaj.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133763dca7d4---32556165082.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/16130904732256---37190240518.pdfIn PDF document text
    • http://thueotodn.com/uploads/image/files/vomitatuxanowelamizo.pdfIn PDF document text
    • http://budgettranslation.hu/sites/default/files/file/rajeveges.pdfIn PDF document text
    • http://scvumaichiramen.com/uploads/files/dedakilaradonile.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=exe+to+apk+converter+toolPDF 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_off0000d9fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9FC 18384 bytes
SHA-256: 501f1292952a8cba094449607892fcc463ecdd833488eb47c90ac6bd83edcd6f
font_01_sfnt_off000109a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109A4 10348 bytes
SHA-256: 160b4048be7d6cee4e578739a86354f811b834ae4995dfbafdfb94c5bf840f6e
font_02_sfnt_off0001212d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1212D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1