Malicious PDF — malware analysis report

Static analysis result for SHA-256 6dbf276f39834fdc…

MALICIOUS

PDF

74.6 KB Created: 2021-09-07 01:24:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a9de4c460863e0b6d410a7a734bbdaa5 SHA-1: 193a340f4b3def8c54c81d168b3ab7f1114ccf99 SHA-256: 6dbf276f39834fdcdf81ecae68bc3bfb696f1c986acb56331a7f49939cc8ed5d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains a link farm that points to multiple compromised WordPress upload directories and other disposable hosting sites, suggesting an attempt to obscure the ultimate destination of the redirects. While no scripts were directly extracted, the presence of numerous external links and the nature of the heuristic firings strongly suggest a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://dienlanhhonganh.com/images/pic/file/zusisinuwolige.pdf In PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/dfe50c094af6bd38117e249684168952/nofumejeduxuzodewuka.pdfIn PDF document text
    • http://dreambeauty.kr/upload/fckeditor/file/45909483715.pdfIn PDF document text
    • https://1877painters.com/FCKeditor/file/41602023814.pdfIn PDF document text
    • http://conomiya.com/images/uploadedimages/file/rewokavagexafu.pdfIn PDF document text
    • https://monuments-msk.ru/wp-content/plugins/super-forms/uploads/php/files/3f5b67c2b51120b1faf36954ca284a3e/zejoxetamobolokikodufe.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b65f486ecb0---26867118407.pdfIn PDF document text
    • http://villalapinetafavignana.it/userfiles/files/rirekafupu.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/160897f7add225---jaberodiba.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/ladomigotojejokuwu.pdfIn PDF document text
    • http://automotiveenergy.cz/userfiles/file/32835350691.pdfIn PDF document text
    • http://osc-pribor.ru/products_pictures/file/vomevokofipuxopuzixone.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/5gao1gqu4917auda00kue9g162/26622107225.pdfIn PDF document text
    • http://iworking.vn/uploads/files/nifekemewusumimenolodip.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae8907c5c68---75640245778.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/u1t60msaff86sls22roq5meuup/1715849186.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609874baa12ed---89522720562.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c7a31f29f12---zepiru.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/9fd89fa7679812f839adad6a8760f0e1/pewogisuwironusa.pdfIn PDF document text
    • http://xn--or3bi2da319p.com/upload/fckeditor/file/12267765915.pdfIn PDF document text
    • http://doo-san.com/userfiles/file/20210514103848.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba3c8f34470---67838118606.pdfIn PDF document text
    • https://cokhivietuc.com/img-vietuc/files/talusi.pdfIn PDF document text
    • https://ozmutludokum.com/userfiles/file/jejezegenenolijop.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607495e180f27---sewatufapadoxok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=runs+test+table+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_off0000c06d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC06D 10464 bytes
SHA-256: f3c01c3381696b1e47c36c34bf738e4278182e5d5ae41a79cc648d9ea2541a0a
font_01_sfnt_off0000d820.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD820 17216 bytes
SHA-256: dcc94dab7734525dfc61a9c101d130623ddf73219cac4e1a3ea22ca581f1dab5
font_02_sfnt_off0001045d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1045D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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