Malicious PDF — malware analysis report

Static analysis result for SHA-256 27ef55770d4fdd39…

MALICIOUS

PDF

94.1 KB Created: 2021-07-05 12:13:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 70f0ca35d828775fc2757bc14fa0027f SHA-1: 5321e206df328015b9d3302db8eccb52cf8c90d6 SHA-256: 27ef55770d4fdd39cefeb38e07567eee762db51c5653b8e637c7a315e0993b0c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains numerous links to external websites, many of which are hosted on compromised CMS upload directories, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://infrive.ru/uplcv?utm_term=what+does+the+bible+say+about+heaven+on+earth PDF link annotation
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/20lr57s06ammqlcustrleppnt7/tusowobu.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/29243669010.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/titafafotaxiwidadanofifug.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3d2bcca95a---99276336369.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d2dd6e86cf---53758265909.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16083b176039bf---pitave.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a919b57ef2a---sukaxipodut.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/f07eb40d3b842bb5d4bae89f0e91bcd9/pibomivonifotamelitu.pdfIn PDF document text
    • http://mid-europe-ex.com/images/blog//file/xuzigonigimisofagusifus.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1609c6bee24dcd---vejupivopunitolatitu.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/a3098103c7fbe865b4a360b43f25e3b9/nepavuzikixodaso.pdfIn PDF document text
    • https://ozmutludokum.com/userfiles/file/13027919018.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16089e07e35a4a---dalolenisagoxogo.pdfIn PDF document text
    • https://fedico.ca/upload/editor/file/87678600839.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/kmrf48shjahtqat9d4eiper154/59113765600.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/d97061a0dbe110273c88998c87d0bb1a/supowuroferiromamuku.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/160cab4b36c45a---28204531384.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/16099e17930287---4838119790.pdfIn PDF document text
    • http://webinaris.net/ckfinder/userfiles/publics/files/pixoxabujozudewof.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/66259e75b7be8c5ea7aca4cca3c7c095/xefugaxenozavolomen.pdfIn PDF document text
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/160796fb1738ec---xepifutovufu.pdfIn PDF document text
    • http://daoltrading.com/userData/board/file/90683084355.pdfIn PDF document text
    • https://yellowstonewildlife.com/wejipexalevalugijop.pdfIn PDF document text
    • https://tramhuonghanoi.vn/upload/files/japomovesukadorifasav.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f8f100c25a---23889698996.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/117d47804466a52a40d4de2ec77aa81a/fitiv.pdfIn PDF document text
    • http://westernstudioservice.com/admin/userfiles/file/xifumulapetewol.pdfIn PDF document text
    • http://moscowprice.com/content/xuploadimages/file/jamozepoxuwu.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_off00010a9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A9E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000122b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122B5 10760 bytes
SHA-256: aa32385b0f1edb72f16697409e4cde4f4ca25e12f75bd9802f19acf9fc36aa6d
font_02_sfnt_off00013b6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B6A 18184 bytes
SHA-256: d5340468404ef7bdc915ff2bf64d7f99b9170e680509d4bc3516a67d72ee5082

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