Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a65e6d53b274132…

MALICIOUS

PDF

96.4 KB Created: 2021-09-02 22:50:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 08658f0c814c233b3057a03a8d02b584 SHA-1: 67181030974ab25f4835a02ec454be044c90a668 SHA-256: 8a65e6d53b2741328e11fdd3bb6f186546d2aa1b56acee35bb48a21b7116d7ab
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm designed to redirect users to malicious content. The presence of these links and the overall structure strongly indicate a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9897

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://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/159bae9fe2942439d19bfde923530c08/lejifelesuxurupekovew.pdf In PDF document text
    • http://apexhealthnutrition.com/newerac2c/userfiles/file/56780067770.pdfIn PDF document text
    • https://laserbeautymachine.net/d/files/xupalijeroworibivilugaw.pdfIn PDF document text
    • https://supermagnum-bg.com/userfiles/file/dujidato.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/325c733612c4050f0f87e9d3f938ce5f/bapubitebexefudenamenu.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082366955594---daliwom.pdfIn PDF document text
    • http://mellorymotors.ru/admin/ckfinder/userfiles/files/gudaxujuvesukagifosep.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/f0a70d1884db12ee770d445a9e15b05a/dawuwaxavexefad.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094f9a8e8e18---33596834305.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/dcbfffc01ae5405c1a2eef6fafac3473/vekiriworexika.pdfIn PDF document text
    • http://astorandblack.net/emailer/userfiles/file/77835508166.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/kezazakajimawagutupiru.pdfIn PDF document text
    • https://tenekedjieva.com/uploads/file/58170261171.pdfIn PDF document text
    • https://loctra.net/userfiles/file/28544627089.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b3571197f725107829b4d206112b6550/38338773244.pdfIn PDF document text
    • https://yourdentist.ro/app/webroot/files/userfiles/files/xoribuj.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160829b22a8773---97891152090.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b055bb79640---30645269356.pdfIn PDF document text
    • https://fishboat.hr/files/tisajokatisorodixileriwa.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612e28e58cb71---82662291260.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609d1b3ecd361---31691026181.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3524fe3406---68417684941.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa0c532997---64732427680.pdfIn PDF document text
    • http://jgbt.us/pds/userfiles/files/tadonujado.pdfIn PDF document text
    • http://drukarnia-skawina.pl/app/webroot/media/files/64814772360.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/16076fd5a23cac---ruwitafobuxagoroverago.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=pastorelas+comicas+guiones+pdfPDF 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_off00010fb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FB9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000127cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127CB 19956 bytes
SHA-256: 62cbafec73cce1607017b1fd142b69c752cb73d973131e64752a6a6fd913eca2
font_02_sfnt_off00015a39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A39 11064 bytes
SHA-256: de6beebfffa466ffc5ce0b26af3210d669e6724ccb0b559bfca132990464d631