Malicious PDF — malware analysis report

Static analysis result for SHA-256 220ba769bb3ecc98…

MALICIOUS

PDF

81.3 KB Created: 2021-09-15 23:13:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1d87624bca8f501b74ec7631725bee81 SHA-1: fa3788cce9e95ada86372d7615c0e459edf4fd87 SHA-256: 220ba769bb3ecc98de89ae6856b1a86daf35b492d67ad015a6d6781c82bb38ad
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised websites, suggesting an attempt to distribute malicious files or redirect users to phishing sites. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were extracted, the presence of numerous URLs on compromised domains and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic suggest a phishing or malware distribution campaign.

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 https://inprovitmexico.com/ckfinder/userfiles/files/terikalidofon.pdf In PDF document text
    • http://fitviewer.de/files/file/dogulawuvuwi.pdfIn PDF document text
    • http://salkim.com/userfiles/file/natojuxukefunababojibot.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1613ba0ace8ac7---rosiso.pdfIn PDF document text
    • http://baovethanglongmb.com/upload/files/78171657288.pdfIn PDF document text
    • http://stavo-bazar.cz/userfiles/file/figaxesezu.pdfIn PDF document text
    • http://thai-apsproducts.com/file_media/file_image/file/24985641548.pdfIn PDF document text
    • http://knuhpharm.kr/userfiles/file/20210909020831.pdfIn PDF document text
    • http://deborahmayerlawoffices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gafij.pdfIn PDF document text
    • http://kajo-frings.de/userfiles/file/fojujesiduxizateko.pdfIn PDF document text
    • https://eastmangroupllc.net/ckfinder/userfiles/files/38763330845.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f5a985b61d---tevuvutixakevaselete.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/161357823c45b3---murijido.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16136faa31195a---xitewa.pdfIn PDF document text
    • https://quangcaowebsitecomvn.xemlaco.com/uploads/files/72800015068.pdfIn PDF document text
    • http://longthinhphat.net/uploads/files/35386604856.pdfIn PDF document text
    • http://saint-party.com/media/file/38592384150.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16135e00913681---babexolefuvop.pdfIn PDF document text
    • https://amd-export.com/site/upload/file/guriruwota.pdfIn PDF document text
    • http://autoscuolapezzano.it/userfiles/files/90222295330.pdfIn PDF document text
    • http://ysmenmidwestindia.org/uploads/userfiles/file/file/51044915968.pdfIn PDF document text
    • https://bosgo.mn/uploads/files/83873853248.pdfIn PDF document text
    • https://hkfew.org.hk/ckfinder/userfiles/files/pilum.pdfIn PDF document text
    • http://22vek-omsk.ru/fck_editor_files/files/rikisipirafebisadofewole.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=download+ghost+detector+for+androidPDF 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_off0000d862.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD862 10844 bytes
SHA-256: 49150190bbc7d389d204a4d0cf12890664dcc5515588da678d330881226f50cd
font_01_sfnt_off0000f130.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF130 17596 bytes
SHA-256: 1965eab153f00226f58866dd57b5a165096f8c77e3a509c8ef6bd51170ea59db
font_02_sfnt_off00011ef9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EF9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1