Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbbf36138b7454c4…

MALICIOUS

PDF

83.0 KB Created: 2021-09-06 17:31:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9066dfb4b9d84d3b97357fa2e9e1cae5 SHA-1: fee082f65b294cedc96b4b9cacd51d1ea420da4a SHA-256: bbbf36138b7454c48ee11283867458fd93771b2e324bc7689b412ae8b896275f
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or to serve further malware. The file's structure as a link farm suggests it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

Heuristics 6

  • 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.
  • 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://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609b7ce8ab07e---30218874598.pdf In PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bec301b7806---75402027437.pdfIn PDF document text
    • http://cleangroupbd.com/ck/upload/files/fatiborajod.pdfIn PDF document text
    • https://autotoner123.com/home/autotone/public_html/ckeditortest_WORKING/ckfinder/userfiles/files/96707726694.pdfIn PDF document text
    • http://madang.eu/f_pds/fck/file/63463720377.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16077daa1f1bdb---58000386802.pdfIn PDF document text
    • http://piecco.eu/upload/files/lagam.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/68223638678.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c97d8121a0d---28794093236.pdfIn PDF document text
    • http://contextuae.com/resimler/files/95641386298.pdfIn PDF document text
    • http://studiopignotti.it/userfiles/files/kenupesijidone.pdfIn PDF document text
    • https://ctners.com/ckfinder/userfiles/files/77521654255.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/e45ca23434adde69425e83e1c58d1904/mizilex.pdfIn PDF document text
    • http://alliance-ltd.com/userfiles/79737850464.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/161293a0581da6---bupilulasafinekixabar.pdfIn PDF document text
    • http://saopauloairporttransfers.com/ckfinder/userfiles/files/25675602313.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b688a241324---85048230430.pdfIn PDF document text
    • http://restravel.ru/ckfinder/userfiles/files/wefigir.pdfIn PDF document text
    • https://haidangpc.com/contents/files/64018367918.pdfIn PDF document text
    • http://skybuildinfraprojects.com/uploads/zofowulabapoburusawixuni.pdfIn PDF document text
    • https://sbsoftware.ro/admin/userfiles/file/95605786064.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/3834bb003bf8aa747bd395e447da4dd3/maxixaparimujekefilor.pdfIn PDF document text
    • http://oralrem.kz/ckfinder/userfiles/files/gigelofazuvowusuv.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c10450624e5---54045515192.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=bharatha+rajyangam+in+telugu+pdfPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bb62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB62 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d379.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD379 11052 bytes
SHA-256: 5ac0e881d59106898cfbbb22ec4e539fcacf3f177386b7951a1044c8003d16a7
font_02_sfnt_off0000ecbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECBE 16164 bytes
SHA-256: a0f26d9ec2bc0bbc84dfb8c1a224a49f7f70479ac92e21d726acd811d43f3bd1
font_03_sfnt_off0001025a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1025A 1820 bytes
SHA-256: ef4c56b83544acc0eae329b123dcb13384a4443b8ee25b6b011fcec9f25c534c
font_04_sfnt_off00010ae0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AE0 19812 bytes
SHA-256: 5e5318dcf5c89975b6ac5b0862279efdaae551c59b44596fee9f544a3063138e

Open this report in the interactive analyzer, or submit your own file for analysis.