Malicious PDF — malware analysis report

Static analysis result for SHA-256 246e630e767d030d…

MALICIOUS

PDF

81.0 KB Created: 2021-09-16 15:15:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: fa9ba254e8900e43b1aa76fe4f36c496 SHA-1: 456ee128429f6e31530e46fbce57ba56e318a42d SHA-256: 246e630e767d030d906d21a36d354d1df9b1b2e3d73a9db1c1327f7dc2f1ccfc
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-severity PDF_RANDOM_URL_LINK and PDF_SEO_DISPOSABLE_LINK_FARM. The ML classifier also assigned a high probability of maliciousness. The document contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting an attempt to redirect users to malicious content or phishing sites. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://crewmak.ru/uplcv?utm_term=kali+linux+wallpaper+for+android PDF link annotation
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/0c1bc1a524cebb564aa0b128adcd3357/33381409539.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/4q54i5d8mohi9u4srv3fdl7pt7/xulirofuterageveritotupe.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141da068d510.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fc3800acd2---pujosesitut.pdfIn PDF document text
    • http://desushibar.com/userfiles/file/wuzisibatuwutalimival.pdfIn PDF document text
    • http://houselandia.ru/files/zejuzinuvo.pdfIn PDF document text
    • https://stauber.lt/images/files/36332516452.pdfIn PDF document text
    • http://songhandiban.com/uploadfile/file/2021090601004773499.pdfIn PDF document text
    • https://escolaalfa.com/userfiles/file/740228912.pdfIn PDF document text
    • http://cs-golfclub.com/ckupload/files/wijobokifagufavodunaxuwa.pdfIn PDF document text
    • http://hbaoge.com/upload/files/tolujexopukopilewezijij.pdfIn PDF document text
    • http://telek-trans.hu/editor_up/11797235232.pdfIn PDF document text
    • http://dlabiura.kbo.pl/ckfinder/userfiles/files/65287549657.pdfIn PDF document text
    • http://nhatrangpalace.net/app/webroot/upload/files/68372257081.pdfIn PDF document text
    • http://budoprojekt.eu/obrazy/file/viritejupiziwiwoxabap.pdfIn PDF document text
    • http://klaaswester.nl/img/file/wabeni.pdfIn PDF document text
    • https://radiosmile.hu/upload/file/49659913866.pdfIn PDF document text
    • http://seattleteriyaki3.com/uploads/files/10700997734.pdfIn PDF document text
    • https://www.premiumtrade.ro/ckfinder/userfiles/files/bexojol.pdfIn PDF document text
    • http://www.tiande-global.com/ckfinder/userfiles/files/57269203585.pdfIn PDF document text
    • http://www.motionmantra.com/userfiles/files/84235108812.pdfIn PDF document text
    • https://dakhoathienhoa.net/images/files/wagitelexizifekedoxuka.pdfIn PDF document text
    • http://dichvumucin.com/upload/ckupload/files/88260800086.pdfIn PDF document text
    • http://cosmikkino.ru/sadm_files/budadomelaviximumu.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_off0000d6b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6B7 10504 bytes
SHA-256: cae7cea8ef6b9f43806a9c04c6ee8f180f6513cb038252307dd5b4804fd7e3fc
font_01_sfnt_off0000eeba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEBA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000106cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106CC 18200 bytes
SHA-256: 929125198bcd66b2a7790b7f4e23471b48340480c9d10fea371eb3293bbae7b0

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