Malicious PDF — malware analysis report

Static analysis result for SHA-256 b289d5b8ebc5a863…

MALICIOUS

PDF

88.5 KB Created: 2021-08-31 02:49:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 650c37135a8bdb4dfbe889a6d62c5d6d SHA-1: 118304cc7bc5ead11fcf9383caddadc36d23342b SHA-256: b289d5b8ebc5a863a321e29e5138d6fbd99924822beb3dd62c4866f251671be7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://philabc.ru/uplcv?utm_term=greens+and+blood+thinners PDF link annotation
    • http://aotwresort.net/ckfinder/userfiles/files/jamololixedetoreranisoj.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-5-11/20210511055355547841.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/dowimuvunubudubib.pdfIn PDF document text
    • http://zzzwchem.com/upload/files/1848451534.pdfIn PDF document text
    • http://www.miyadenthai.com/image/upload/File/97650283199.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/0ca997a579d048f39db984dc9faecad7/sijopexu.pdfIn PDF document text
    • http://aucoindeshalles.com/menu/file/bepeji.pdfIn PDF document text
    • http://wirtrauenuns.ch/images/file/zumimewubufozajovirupiz.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160db4f62435b1---21707617521.pdfIn PDF document text
    • http://charugarware.com/DEVELOPMENT/charu_garware/uploaded/userfiles/file/retezesadudu.pdfIn PDF document text
    • https://bwawarszawa.pl/upload/file/60749290827.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/f8471cd82442c9fb1a54b1f1d243472c/renogasirak.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/rf9gmtuqt5b2jtblc3uj8q5s46/sedikuveduk.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aace9f5373f---tumexodurufifijeb.pdfIn PDF document text
    • http://stoewebdesign.no/userfiles/file/lebif.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c987a4291b---boguwadaxukobaxanopigubu.pdfIn PDF document text
    • https://alixdemassy.fr/userfiles/file/8050013785.pdfIn PDF document text
    • http://ajisushionline.com/uploads/files/91577971225.pdfIn PDF document text
    • https://zweefvlieg.net/userfiles/file/90330395416.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c54f1bac630---72462787326.pdfIn PDF document text
    • http://gazosilikatnn.ru/uploads/files/80393248266.pdfIn PDF document text
    • http://nachhilfeschule.havonix.com/ckfinder/userfiles/files/48187353784.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a44d8d89c4a---93651073595.pdfIn PDF document text
    • 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_off0000f0f2.bin
6e4a474d0248feab1528bc08c8aec0a7738bb1d3aea3c0be34be85197adb264c
pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F2 19692 bytes
font_01_sfnt_off0001236f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1236F 16792 bytes
font_02_sfnt_off00013b86.bin
3277fed8a2653b1b9210dd4cd32499bcc268edd475dc198c4e5e6d8409c5baf1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13B86 10524 bytes