Malicious PDF — malware analysis report

Static analysis result for SHA-256 4261479aa4a98e63…

MALICIOUS

PDF

87.4 KB Created: 2021-09-10 23:33:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5f451476dbc08d6a9c90be9264a4ffe8 SHA-1: 08fca90e60d33cb5100d5f6d0f62048709933801 SHA-256: 4261479aa4a98e636a8ae3ac1a97f08a75d74852d0bb1834f9b2441565803607
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to obscure the final destination. The presence of a 'roblox accounts with robux generator' UTM term suggests a phishing or scam lure. ClamAV and ML classifiers also flagged this PDF as malicious, likely due to its structure and embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613a4abc0a253---xosomo.pdf In PDF document text
    • http://lyzebrno.cz/userfiles/file/80670149231.pdfIn PDF document text
    • https://s-serviss.lv/userfiles/file/nebidinajif.pdfIn PDF document text
    • http://uro-medical.pl/zdjecia/fotki/file/miwibotoleposa.pdfIn PDF document text
    • https://cicadit.ro/UserFiles/file/36190826012.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/87557810788.pdfIn PDF document text
    • https://travelone.ae/userfiles/files/kagonixikatufanagixud.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/81ao4voa6ajcf5m0b36p9frkv4/xulorimewem.pdfIn PDF document text
    • https://digireg.lu/upload/nugifopiguwodavoxal.pdfIn PDF document text
    • https://panificioilcavaliere.it/userfiles/files/58836112333.pdfIn PDF document text
    • https://ivantomanov.com/userfiles/file/35635637218.pdfIn PDF document text
    • http://cavusofis.com/images_upload/files/davifasu.pdfIn PDF document text
    • http://sewakendragroup.com/userfiles/file/fenel.pdfIn PDF document text
    • http://se-ty.ru/uploads/userfiles/file/59724377869.pdfIn PDF document text
    • https://pchome.uzai.ca/upload/files/ropusumeberebezonilotu.pdfIn PDF document text
    • https://ostrichpharmaceuticals.com/userfiles/file/zuxexumidaner.pdfIn PDF document text
    • http://khodahoanglang.com/admin/webroot/upload/image/files/roxad.pdfIn PDF document text
    • http://kramnyca.info/img/upload/editor/file/panagidi.pdfIn PDF document text
    • http://clinicaveterinariabilancino.it/userfiles/files/wozugimutodavaf.pdfIn PDF document text
    • http://emusicmarket.com/upfile/board/files/xagawajadumigirabo.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/j9b3phugkh5v6s8bklacjna8i6/pavijofoxanuje.pdfIn PDF document text
    • http://midoriku.zaitakunet.jp/app/webroot/upload_images/files/80434659204.pdfIn PDF document text
    • https://heatingboiler.ca/fck_upload/file/2373384023.pdfIn PDF document text
    • http://resortcrimea.com/ckfinder/userfiles/files/38386318638.pdfIn PDF document text
    • http://elcampoeco.org/FCKeditor/file/9269052214.pdfIn PDF document text
    • http://kommunikator.nu/demo/userfiles/file///55310036426.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=roblox+accounts+with+robux+generatorPDF 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_off0000ef18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF18 10980 bytes
SHA-256: c15c719554b82900d5d022794990b0539829a498e500fba2cd5e494d2dc8b140
font_01_sfnt_off000108b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000120c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120C6 17992 bytes
SHA-256: 842a7f138089c828462413d7edbc997fa421ffd41a02641de04d5b94cabb9d0e