Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8fefbb37f732aea…

MALICIOUS

PDF

89.5 KB Created: 2021-07-17 09:38:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 44c83afcb0bf67f6fe31de91a13f47a7 SHA-1: e725b859aa10d0112fddfe36829553b2ad82c3d2 SHA-256: a8fefbb37f732aea5ab8196924fae1f24775621b6d31ab49623191c86e93dccf
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites and disposable hosting, indicative of a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious content or phishing pages. While no scripts were extracted, the structure and URL patterns point towards a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://moderator.lt/components/com_mijoshop/opencart/image/data/files/14864289363.pdf In PDF document text
    • http://www.anjhimayath.com/upload/file/16488509057.pdfIn PDF document text
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3368d9747---dotuporumarazomepa.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/6a0f20fd7541e2daa045d6a4e15faebc/40736720629.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609f8d7216f0a---35563970839.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16096f93049159---27957348788.pdfIn PDF document text
    • http://j1medical.com/uploaded/file/13111262697.pdfIn PDF document text
    • https://asthasupermarket.com/userfiles/file/39812471701.pdfIn PDF document text
    • http://sxcec.org/userfiles/file/suzejudonamizivoraj.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/03dd55a2742855acdf21e1b822e9d2ab/denekomadumuxenom.pdfIn PDF document text
    • http://denki-shonan.com/uploadsfile/69005474064.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/89033a26632ce0e3d5293b3e0a39341f/xolizedugaduriwiz.pdfIn PDF document text
    • http://cnc-soustruzeni.cz/files/file/kodenuxaxilunekejerajaxir.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6b1e5db2a7---75315589905.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/5046cc5e25d085a385ba38c63e465f5e/25030136160.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/a743568bcb1b8343d8018fdd2f2f77a5/34543478077.pdfIn PDF document text
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/a6b15d7fb0e7122e571b6850c3a78d1b/tepor.pdfIn PDF document text
    • http://www.neoneophytou.com/ckfinder/userfiles/files/24261748908.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///202162442854873.pdfIn PDF document text
    • http://originalbau.hu/imagesfiles/8853597951.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160740ab7e174d---44698461588.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160722536e1f55---jolimiwuxukufonumiru.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/d55f2a7501e592bf99869c720cafafe7/belatubafofemeriged.pdfIn PDF document text
    • https://alianzatours.com/imagenes/file/35248263726.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=urethral+dilation+for+interstitial+cystitisPDF 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_off0000fba0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA0 17080 bytes
SHA-256: 4af4799e8ac43ad0f2d26de0b4712f3d795c903615373da63a65719931d97220
font_01_sfnt_off000127e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013ffb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FFB 10692 bytes
SHA-256: 41dea18e903882a33b80780fe7f8f8e728d6c6652bd25d784424970adb0bddc1

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