Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f26b068f2b9fed4…

MALICIOUS

PDF

84.7 KB Created: 2021-09-16 15:20:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ebab937e7a351b7b5eb8be48a2f7f7ac SHA-1: ad927bb7f9387b0c58ecb5069fe441bc461eaa18 SHA-256: 4f26b068f2b9fed4491f0a2d3a49ed3d5ab9663f9ccf1eeacd21797a5fd8e560
156 Risk Score

Malware Insights

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

The PDF contains a large number of external URIs, many of which point to potentially compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://sporteambiente.it/ckfinder/userfiles/files/sesulubujix.pdf In PDF document text
    • https://invest.pl/userfiles/file/252055661.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/acad0f7291b16cd373003d14704b38dc/fesilukufebawenusuwezu.pdfIn PDF document text
    • https://meesens.be/KrMee/Tekstverwerker/64071623775.pdfIn PDF document text
    • http://fourfoods.com/images/files/nenufijezijodurepusuki.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/etthd5rb9m5lhb051h1c7va488/91726313722.pdfIn PDF document text
    • http://gediklimakinahidrolik.com/resimler/files/xotirakorusaparulazokevuz.pdfIn PDF document text
    • http://scuolascifondocortinadolomiti.it/userfiles/files/89976196885.pdfIn PDF document text
    • https://brillimet.com/uploads/files/202109070906009094.pdfIn PDF document text
    • http://zhouzhuanx.com/v15/Upload/file/2021911316447484.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612f3ff6e5bf8---vigivolulabizaf.pdfIn PDF document text
    • https://dalba.net/other_files/File/gisefibalazobinufupaxo.pdfIn PDF document text
    • http://er-trans.com/img/produkty/files/62276879504.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/188e4dea8e4eab28bf5ff8c1cdbc53be/donikimofawatisuzuko.pdfIn PDF document text
    • http://daglichtfilters.nl/ckfinder/userfiles/files/27613985356.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161375175e1c86---5534329979.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dd0153f18c---nazuzomesepoviju.pdfIn PDF document text
    • http://www.optimizecost.com/admin/ficheros_fckedit_subidos/vesomerefebo.pdfIn PDF document text
    • http://synerfreight.com/syner_upload/images/files/6657063022.pdfIn PDF document text
    • https://stl-log.com/htdocs/cljr/data/files/taxujugaluxeloliz.pdfIn PDF document text
    • http://artpolinakuzina.ru/pict/file/33242546409.pdfIn PDF document text
    • https://textmakareknutsson.se/upload/image/zajororem.pdfIn PDF document text
    • http://sun-green.nl/ckfinder/userfiles/files/werotulesipobod.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16137ffa8ebcf0---perapujaxakoguwenoniw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=free+android+emulator+for+linuxPDF 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_off0000e4a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4A3 10528 bytes
SHA-256: b4036ab2a7e90889c6491e9fb37c066aa12944b290b79455088ef640d92eba3a
font_01_sfnt_off0000fc86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC86 18572 bytes
SHA-256: a3c10bee561ddf2d088ae3698bbaeffb99d6abe5b8d30b6fb6d268890fd61f92
font_02_sfnt_off00012d0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D0E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1