Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b8dd2a4c048fe47…

MALICIOUS

PDF

87.3 KB Created: 2021-07-17 19:24:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 0eef953cb9621a4d2cc6bf25e0d2b62c SHA-1: 21d596c98a753c9c200c238bc432a8f33cb36c6a SHA-256: 1b8dd2a4c048fe47b564bc25246a2cb021cd4fe1227de156b7844b9202de3320
156 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to numerous compromised websites, many of which host other PDF files. This structure is indicative of a phishing or malware distribution campaign, where users are lured to click on links that ultimately lead to malicious content. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ccf53a4efff---razesexopomesuz.pdf In PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c85febad7ae---fesizewegab.pdfIn PDF document text
    • https://digireg.cz/upload/mutugegipepunowoxonewalu.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/3918a7e9b4a48ecdc4dbb22878c86889/dejoxuxukederebire.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ccc788e6844---dasovo.pdfIn PDF document text
    • http://ndt-tl.ru/upload/file/sefowepip.pdfIn PDF document text
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/66817c2163c0f2d2d4758aade5eabe3f/63522225912.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/wegubenuzodofobaze.pdfIn PDF document text
    • https://novahealthclinic.ca/userfiles/file/xegamisadibixudewen.pdfIn PDF document text
    • http://atomleasing.ru/media/File/43486666791.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/8de46a7782fd91388a481561495e51f8/gixibexiruluxumupixevigo.pdfIn PDF document text
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/e8quvgnbgbbblgcgpn71hksa24/72189617270.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1b48ed69ce---domebanakukukejoju.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/1d6d9c0f313adf7cb9732ed7d4f9a5cc/xujebajurajidisow.pdfIn PDF document text
    • http://resetimpianti.it/reset/public/file/benuwuvubomogi.pdfIn PDF document text
    • http://shriadinathbank.com/uploads/16833614895.pdfIn PDF document text
    • http://caratow.eu/userfiles/file/duzuxotalijid.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/lomaxidepivugizaro.pdfIn PDF document text
    • http://xn--b1agjlwjc3g.xn--p1ai/ckfinder/userfiles/files/40200820354.pdfIn PDF document text
    • http://thegioidahoacuong.com/uploads/image/files/pifasub.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4d4b23655e---poluxa.pdfIn PDF document text
    • http://www.flamanville-76.fr/upload/file/2903708423.pdfIn PDF document text
    • http://ashioke.com/images/library/File/libogawatekan.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=star+reading+scores+chartPDF 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_off0000f350.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF350 17156 bytes
SHA-256: 2ad636b166419e0202578d38d89a460a558c0cc40a53266182fc1cdb7ef3c76f
font_01_sfnt_off00011ffc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FFC 10676 bytes
SHA-256: a571293bdd6f579d794e58bcbbc7fd4637fe509d8c5c421d2238efc48a850f69
font_02_sfnt_off00013828.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13828 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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