Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1baea3ad8a19543…

MALICIOUS

PDF

89.4 KB Created: 2021-09-04 22:24:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 46999a3440e472bdc43bb386d7f762f5 SHA-1: 2251f6dba2f779260a85edd676c4f42383bd26ee SHA-256: b1baea3ad8a1954352809dfccf954d871da3a9ac699caf59a5d28af95b02fc0f
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or are part of a link farm designed to distribute traffic. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://assotechne.eu/userfiles/files/monaledetiwisuxosubuxijo.pdf In PDF document text
    • http://bhk-aindling.com/userfiles/files/tizibimekinaxo.pdfIn PDF document text
    • http://cisseo.net/userfiles/files/xijuxuwapizisimobidaxi.pdfIn PDF document text
    • https://agmatbaa.com/upload/files/wibikutuvuvawavoxal.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160828f5e1129f---7727261037.pdfIn PDF document text
    • http://magendans.com/imagefiles/file/mejekuligefujivimes.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/161241305344f1---25314483499.pdfIn PDF document text
    • http://chip-chup.hu/upload/file/vawomidumitavapaxel.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/160a9f5b4e0eb2---97601256170.pdfIn PDF document text
    • http://fsgpj.com/upfolder/e/files/20210727033633.pdfIn PDF document text
    • http://attep.com/home/sandbox/domains/heekee.com.hk/public_html/ckfinder/userfiles/files/fasapofimupovinos.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160acabd3ac154---86533323193.pdfIn PDF document text
    • http://bargiel.com.pl/ckfinder/userfiles/files/44887158497.pdfIn PDF document text
    • http://reafamily.lt/ckfinder/userfiles/files/16323947759.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/99c98ac252f43a92b98ec9a5ea6eab0d/bonemolarakozuposoraxen.pdfIn PDF document text
    • https://www.jscorporation.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160888f8fdf98e---5158208776.pdfIn PDF document text
    • https://cplastik.eu/data/cms/file/borexegalaxifosexom.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609e33fb1c18b---sekuvumuvimu.pdfIn PDF document text
    • http://sahrugs.com/userfiles/file/bolirefekuv.pdfIn PDF document text
    • https://kurtwohndesign.ch/userfiles/files/90774139546.pdfIn PDF document text
    • http://go-pxl.com/uploads/files/tuvifineginopujonekenel.pdfIn PDF document text
    • https://equantumconsulting.com/files/files/99318817432.pdfIn PDF document text
    • https://asiarsolutions.com/userfiles/file/pumisusavuwufobivepasovuv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=vowels+and+consonants+peter+ladefoged+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f3fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010c0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C0D 19552 bytes
SHA-256: aea9f2d03852186d792fdabfc09a4deb294d5b979cc40c5eeea2c72412a39108
font_02_sfnt_off00013eb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EB8 10756 bytes
SHA-256: 51d12e2bc449c45f78e6e270472386278a05fa1894c0ca567ebd03971fb6baaa

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