Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5da8e4ec44aa2fb…

MALICIOUS

PDF

79.7 KB Created: 2021-09-15 19:49:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b9550a70407efd0753e0d4c9622c5328 SHA-1: 64f484459a233f8736e0f2f68f994357c08ff8ac SHA-256: b5da8e4ec44aa2fb8a2046b93b083fa4337424bded3e5625c611aed1f7917e43
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm, with multiple URLs pointing to potentially compromised or disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of a URL with `utm_term=legit+free+robux+websites` indicates a potential lure for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dailyhondaotomientay.com/upload/files/34716547216.pdf In PDF document text
    • http://sino-web.net/filespath/files/20210915142027.pdfIn PDF document text
    • http://bptramptour.pl/files/file/nexizovexetenevut.pdfIn PDF document text
    • http://hanlacsclub.com/ckupload/files/37397325535.pdfIn PDF document text
    • http://dobermanncz.eu/files/xirigamevuberixojabupef.pdfIn PDF document text
    • https://burragebrothers.com/demo/jolie/beta/userfiles/files/57537524527.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613e5678c7204---tiliz.pdfIn PDF document text
    • http://myphamso1.net/uploads/files/33596423243.pdfIn PDF document text
    • https://piataafacerilor.ro/app/webroot/files/userfiles/files/xonawubezu.pdfIn PDF document text
    • https://ijmscr.com/ckfinder/userfiles/files/90767845736.pdfIn PDF document text
    • https://lanhcongnghiepthinhphat.com/upload/files/40630906226.pdfIn PDF document text
    • http://shopgraeagle.com/ckeditor/uploads/files/ratedo.pdfIn PDF document text
    • http://laureysnv.be/uploads/files/3681658625.pdfIn PDF document text
    • http://www.prakashirrigation.com/uploads/fck/files/40196008618.pdfIn PDF document text
    • http://yakutiaprime.ru/SITE/files/editor/file/93900182168.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613017db82db4---gudixivagupinimoxibi.pdfIn PDF document text
    • http://zagazzo.com/userfiles/file/bidogalagakiwajamuru.pdfIn PDF document text
    • http://gabortech.com/admin/file/19348754969.pdfIn PDF document text
    • http://tizianaiberti.it/userfiles/files/16894565480.pdfIn PDF document text
    • http://gamaxmotor.cz/data/dokumenty/84179877464.pdfIn PDF document text
    • http://aviafond.ru/userfiles/file/gikefukexotufulizamojo.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/busilovipegosiwozagegufi.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/e1e2e26761794a6427562e133b5608d0/49019620481.pdfIn PDF document text
    • https://vibangnhadat.com/uploads/files/towiroramop.pdfIn PDF document text
    • http://iscelenie.info/files/file/50276251907.pdfIn PDF document text
    • https://brtim.com/uploads/wysiwyg/files/34807163851.pdfIn PDF document text
    • https://enilubricant.hoakhanh.vn/uploads/image/files/1239439596.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141aa5e0a50a---4203710489.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=legit+free+robux+websitesPDF 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_off0000d5fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE10 16572 bytes
SHA-256: 9908b71777350c06b0f9b9996d8ac0c0854218229944f7a4785d4958f21048d2
font_02_sfnt_off000118b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118B2 10460 bytes
SHA-256: de674019143179b7bb94c2ace7989b3535fdc7f02ec9aafc55723847ded251a4