Malicious PDF — malware analysis report

Static analysis result for SHA-256 acb7c0ec306acd7e…

MALICIOUS

PDF

81.3 KB Created: 2021-09-21 11:59:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e01204285bee40b7b71eec6860f5a40f SHA-1: 5ccde6649164613abef05fef33390ff57af99d01 SHA-256: acb7c0ec306acd7e9f3bee8296827eed4f42cb17f617c3211b2f21e33e9bf4f3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was identified as malicious by a ML classifier and ClamAV, indicating a high likelihood of malicious intent. It contains a link farm hosted on compromised WordPress infrastructure, with multiple URLs pointing to potentially malicious content. The presence of external URIs and link farm heuristics suggests the document's primary purpose is to redirect users to other sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/9e30f5980a2711205ceb1f4a2deef388/basirudofarid.pdf In PDF document text
    • http://daiichibus.vn/uploads/news_file/84524940953.pdfIn PDF document text
    • https://www.leadercaravans.com.au/application/third_party/ckfinder/userfiles/files/vasobuxirajoboteravo.pdfIn PDF document text
    • https://transport.frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/zuxosusadulixa.pdfIn PDF document text
    • http://droprint.my/home/ququ4923/public_html/userfiles/file/duguruliwofojasamagoje.pdfIn PDF document text
    • http://dioceseofniranam.org/userfiles/file/xegegutejegijejase.pdfIn PDF document text
    • http://321eastern-thailand.com/userfiles/files/gelasezeg.pdfIn PDF document text
    • http://www.psychophonie-tarbes.com/ckfinder/userfiles/files/15332388100.pdfIn PDF document text
    • http://studioambienteterritorio.it/userfiles/files/dewisava.pdfIn PDF document text
    • http://cataga.de/beta/files/file/75620741436.pdfIn PDF document text
    • http://novena99.com/uploads/files/202109130314056844.pdfIn PDF document text
    • http://hasdeu.md/data/userfiles/files/46681040610.pdfIn PDF document text
    • https://network-italia.com/file/menupoleregozusajaxesepa.pdfIn PDF document text
    • http://rudolphalexander.com/uploads/files/losuxofumefubotivevikuxiz.pdfIn PDF document text
    • https://xn--nmqu14inmf.com/upload/files/fasugug.pdfIn PDF document text
    • http://veewood.com/file_media/file_image/file/lorexodafizez.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613336a4834fa---13588853133.pdfIn PDF document text
    • http://camelliafb.com/uploads/files/202109120909237480.pdfIn PDF document text
    • https://alummaswaja.com/yii/sdbalikpapan/home/images/upload/files/bowamu.pdfIn PDF document text
    • https://autohausnschmidt.de/userfiles/file/62716470915.pdfIn PDF document text
    • http://bluebiz.kr/userData/board/file/zosamodo.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/96d706c4441d12f46f1765c3dfec2f5b/14203899822.pdfIn PDF document text
    • https://www.rougeindigo.com/ckfinder/userfiles/files/zibobuxa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=keyboard+wallpaper+for+phonePDF 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_off0000d82c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD82C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f043.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF043 10568 bytes
SHA-256: 44d156575e5ee5505fb6143fbd1cf8d076cdf252132fd1f11900163edc9af831
font_02_sfnt_off0001081a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1081A 18272 bytes
SHA-256: f75d931adc588f15116b3d86cf16c00e9c000b538a588769250209653d534c77

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