Malicious PDF — malware analysis report

Static analysis result for SHA-256 53ca6e7f891d9a8e…

MALICIOUS

PDF

90.2 KB Created: 2021-08-26 01:20:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 8f8dc8d764e4452e861a21bd0de8bf6c SHA-1: c31e19f352b98f5e51d0c0b1564391c4478336ac SHA-256: 53ca6e7f891d9a8e4296c420229be31bf59faaff8b52b2fb4a4db5acdaff89da
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress sites and potentially disposable hosting domains. These links likely serve as a distribution point for further malicious content or phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/160adfc80ad23f---60874783782.pdf In PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/c39ac4bee5c577a3cbf4e652dcfd34e0/43339730546.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/3jhft2b4ejo3o43rrgcsjf1vlt/wasuwepolegot.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b633c825b82---sapakefuwulowa.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/40e8ea81d1dfd3baec7e6031f4cee165/45421258561.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/sejekilemilitakipex.pdfIn PDF document text
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/039ccb5e0099ff1bc2452836fadfa4eb/17428420794.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160dadff52793b---14708792683.pdfIn PDF document text
    • http://standartbio.com/fckfiles/file/vinisi.pdfIn PDF document text
    • http://residencecarlofelice.com/userfiles/files/60509433498.pdfIn PDF document text
    • http://islandpointfl.com/userimages/35192704415.pdfIn PDF document text
    • http://baocaosuhoatoc.com/luutru/files/digafadabezulamo.pdfIn PDF document text
    • http://wskinbody.com/data/boardData/files/37563445634.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/6pucj712t8lq59rh16k2ndo2j1/11397331429.pdfIn PDF document text
    • https://net-mex.hu/ckfinder/userfiles/files/vujitikawibisigimazutuwob.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090964b0f5bd---rofebujefube.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/2b251265ea6dde44d738bce1150f5f6a/xolukojo.pdfIn PDF document text
    • http://asirakademi.com/resimler/files/17086663201.pdfIn PDF document text
    • http://wimborst-ceramics.nl/public/view/upload/fckeditor_images/file/55164323605.pdfIn PDF document text
    • https://balajihighfields.in/userfiles/file/ruwozunafimimepawogokub.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/videwogaxez.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d985ce6daf7.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b51d9f2d5d9---fizodajisodinewujuxowelo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=watch+high+school+musical+the+concert+online+freePDF link annotation
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/47f43c83e7314712dcd7d7d0f5070d67/tevone.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_off0000fab1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAB1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000112c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112C8 10876 bytes
SHA-256: 396132cf5a928c672aae333346fdc9a4580fc4181b5e0470faea9329e1d07117
font_02_sfnt_off00012bca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BCA 17880 bytes
SHA-256: ea1ecb80a011844baa27a0f3ca987c05fbb9b37cbc165f9c9d10cf88c7fbf4b6