Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf454e3e8a7710bf…

MALICIOUS

PDF

98.1 KB Created: 2021-07-22 01:24:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9aff89644ad3e28454e417b37f98bd01 SHA-1: 1b3b3f38bdb03c1994c943f167c6574e40426921 SHA-256: cf454e3e8a7710bf77930c337b39aa58165f69cc8e210bac79b4d88a2e583ae3
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to compromised websites, many of which are hosted on disposable domains or point to CMS upload storage, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to trick users into downloading a secondary payload. No scripts were extracted, but the presence of external links points to a downloader pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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 http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160bc5e0bca5ce---taxexutarivu.pdf In PDF document text
    • http://pauseforserenity.com/clients/1/10/1002a5d8b3740fc7390aa1937d1ec3ed/File/2726798521.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/76191972888.pdfIn PDF document text
    • http://viettelhaiphong.me/data/dulieu/files/kijagazonobe.pdfIn PDF document text
    • https://www.ccs-corporation.com/ckfinder/userfiles/files/futemebepidaj.pdfIn PDF document text
    • http://marta-galan.com/files/varios/file/rokovijot.pdfIn PDF document text
    • https://www.ideaklinikankara.com/wp-content/plugins/formcraft/file-upload/server/content/files/160752bcc5a357---84936828419.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608b2824a1584---81909842701.pdfIn PDF document text
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d287f30556---xotepemujeretaw.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/iongfesbm4jaiviidvv722eveg/nusufiregudadagutolatuxo.pdfIn PDF document text
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/jusosumifino.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b575b0a876---86677493982.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/80d72963b0f35fe865b40e411559d14f/49235771035.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/3a1a22d0291a8bf5bf9c1e11a8f62dea/43416767230.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///95372697138.pdfIn PDF document text
    • http://aklond.com/UploadFilesfile///2021042823344038.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-6-14/20210614092622997896.pdfIn PDF document text
    • http://hebertfamilyreunion.com/clients/3/32/3272330ca4c68e8b1120eb7f178c7a05/File/tiwumigabixogozugiw.pdfIn PDF document text
    • http://goodslib.com/userfiles/files/75799850092.pdfIn PDF document text
    • http://normel.org/files/upload/file/piruvujun.pdfIn PDF document text
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/515247be9ed5563b235ee99ee24078a7/61346725656.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/6ikj050ua278099t1obif10vo5/51344804644.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/mfmnli3h61nkf6bdi2n5s2ptu0/nesatezinerapasafugepeteb.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/gmf1ilqkr722brm4p7dss0h479/44275834160.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=what+is+bear+catPDF 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_off00011a18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A18 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001322a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1322A 18664 bytes
SHA-256: 4130143c81fcc175ca4f694e9f17a4fb5f646831b8debb2d9b88c4216a30ea3c
font_02_sfnt_off00016223.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16223 10192 bytes
SHA-256: b9216585f8b4f94523a2f3a1f15b0535afae8d87dd04de79a47aadfc15c2a317

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