Malicious PDF — malware analysis report

Static analysis result for SHA-256 0283097704ec681d…

MALICIOUS

PDF

76.3 KB Created: 2021-09-10 04:27:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0d34501b8d9bc23f6643d8addeb28c7f SHA-1: b8b1738f50947e1e465fc50a3c437439b3f87125 SHA-256: 0283097704ec681db8bc09bad854707cedb7ef787db82641b1a24c41d25383d0
164 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The presence of a 'download' button lure further supports this, aiming to trick users into downloading a payload from these compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://salondebellezaanamariaromero.es/ckfinder/userfiles/files/95375735728.pdf In PDF document text
    • http://andrelandberg.com/userfiles/file/25142013021.pdfIn PDF document text
    • http://debseven.net/UserFiles/File/dezexifajivapit.pdfIn PDF document text
    • https://timminsrenovations.ca/file/Vy1CVYZhB8T9ICun.pdfIn PDF document text
    • http://yusungchart.com/userData/board/file/99990363725.pdfIn PDF document text
    • https://alohasafaris.com/files/xixepujanurajefitovigizon.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613a99ecf2582---41675021443.pdfIn PDF document text
    • http://www.coverseg.com/uploads/ckfinder/files/rutewemusabudulafog.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613aae0e0c6d1---83164770349.pdfIn PDF document text
    • http://wmc21.com/ckupload/files/japerarimaninadogurilur.pdfIn PDF document text
    • http://ytbozhuo.com/upload/file/07233219821.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec2631364b---vefazinemezelaresil.pdfIn PDF document text
    • http://sabaispa.net/userfiles/file/zowugiminobokelavuj.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/577956cc118e3cc2c5a29cdad1188aed/xokixebatasenifeto.pdfIn PDF document text
    • http://sitoad.com/bbqjoekey/files/202109062203159023.pdfIn PDF document text
    • https://getracemirates.com/userfiles/files/naxapikinuzedexixuzel.pdfIn PDF document text
    • http://gzcaifeilai.com/ckfinder/userfiles/files/202109091834013865.pdfIn PDF document text
    • http://massvt.sk/editor_uploads/system/files/83037751314.pdfIn PDF document text
    • https://hoangvan.vn/wp-content/uploads/files/78433631148.pdfIn PDF document text
    • http://imobilestore.de/userfiles/file/16808937663.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136aaf3c512e---kokataferiwunisanejafo.pdfIn PDF document text
    • http://szentdorottyapatika.hu/files/8949406283.pdfIn PDF document text
    • http://ckrestaurantgroup.com/ckfinder/userfiles/files/7248829304.pdfIn PDF document text
    • https://vsetinrally.cz/userfiles/file/44171907033.pdfIn PDF document text
    • https://zhansq.cn/upload/file/lepiperupufo.pdfIn PDF document text
    • http://jayeonrak.com/upfile_editor/2021/files/ranonogofewerupaz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=cara+hack+kamera+cctv+dengan+androidPDF 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_off0000c78e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC78E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dfa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFA5 10792 bytes
SHA-256: fe1050968cc9c5919a359e98c9d6be3d4040ffed17eef477f72b46bdc8cae90e
font_02_sfnt_off0000f82c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF82C 16808 bytes
SHA-256: e361da53e4fd78239eb15a835293b4981bf38483ab462d57df1543d34ba6d995

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