Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6e7428af9e1f592…

MALICIOUS

PDF

90.7 KB Created: 2021-09-02 00:57:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a12a34bdc0d000adafc945d61ed08e40 SHA-1: 86a22584cc1c664ae61ce6c17c664a81ae07f98e SHA-256: d6e7428af9e1f592db9b20c0010641ec4d34994aaf1f022d17e0301a4da4b4da
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous external URIs and link farm heuristics, indicating an attempt to redirect users to potentially compromised websites. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure and heuristic firings strongly suggest a phishing or SEO poisoning attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9923

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://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/dbd111e420294092cd712f73a0861bb2/kerikiweresutufalejisoser.pdf In PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089a3f2cbe32---gojekesisebaludupakedu.pdfIn PDF document text
    • https://gcr.goldcrownresort.com/magazine_files/files/danilumizunowaba.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/pptt235bb3omkkvsn196ll44jh/20375672674.pdfIn PDF document text
    • http://pappteam.hu/userfiles/file/20878151315.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-5-14/20210514040143587742.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160757b6b3f1ce---38883725175.pdfIn PDF document text
    • http://champagne-marc-chauvet.com/images/files/93825953074.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608d2d9002fdd---57021334577.pdfIn PDF document text
    • https://beautyreviveshop.com/newerac2c/userfiles/file/2091950117.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1612eaf5fecec7---jeloguredututunoke.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/ctoua976b1i7eeqk5v95u0v66j/78749657852.pdfIn PDF document text
    • https://watertorens.nluserfiles/file/42876066738.pdfIn PDF document text
    • http://hurtglass.pl/upload/file/sijazatekob.pdfIn PDF document text
    • http://fqcycpa.com/jingkelun/userfiles/files/20210626114712.pdfIn PDF document text
    • http://mea-travel.pl/userfiles/file/limudan.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/qliqlr51kvf1bmv2sacliiiaok/menufaf.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082b1cfe9a15---16438714611.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7971a2769a---fubosotugul.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/93857301834.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ef9ce285f2---2069378493.pdfIn PDF document text
    • http://ambulatorioveterinariorigolon.eu/userfiles/files/radudiko.pdfIn PDF document text
    • http://retroldn.com/userfiles/file/gokil.pdfIn PDF document text
    • https://noddy.nu/images/file/98843809767.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f9b077e068---ronozupubusetekutusa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=cancer+chemo+pricePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7F9 17952 bytes
SHA-256: 67a693ea46e0bed30de4365fb9a15fc939057b1f5ef3667c83ec6141cce4cb94
font_01_sfnt_off000116a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116A4 10356 bytes
SHA-256: 9d7c4dffdc6932993ae56e67144ab60529ecebe16901296684d40ecedbdce3dd
font_02_sfnt_off00012dcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DCB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000145dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145DC 16632 bytes
SHA-256: e896d0c9c6509c93731645541c0836c845742b74f7fde2e8ff5e94baacc6a6a0

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