Malicious PDF — malware analysis report

Static analysis result for SHA-256 86d72d710adb01a3…

MALICIOUS

PDF

70.9 KB Created: 2021-09-18 08:49:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 86b3ba07ee50a10c5a3cf54623f23658 SHA-1: 0758ec340e924c0e0649cd3d4270649ae7c16eed SHA-256: 86d72d710adb01a3af4a5783e87037dfbba879344c8af5099b7037e8c037c04e
96 Risk Score

Malware Insights

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

The ML classifier strongly indicated maliciousness, supported by heuristics identifying the PDF as a link farm pointing to numerous domains, some of which appear to be compromised CMS uploads. The embedded URLs likely serve as lures for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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://krisoc.ru/uplcv?utm_term=boss+in+love+full+movie PDF link annotation
    • http://yuqiaohome.com/uploads/files/202109010450565165.pdfIn PDF document text
    • http://cmtsport.com/pliki/82137954622.pdfIn PDF document text
    • https://fcksa.com/ckfinder/userfiles/files/88899579079.pdfIn PDF document text
    • http://nomayaku.com/userfiles/file/16656858292.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613c59ccf025f---81498304606.pdfIn PDF document text
    • http://irvine.songhakbbq.com/uploads/files/giluzonoj.pdfIn PDF document text
    • http://lrm.mcdonalds.ua/ckfinder/userfiles/files/3326382649.pdfIn PDF document text
    • http://ergakiland.ru/files/files/77478371934.pdfIn PDF document text
    • http://archiw.gbpopatowiec.pl/img/upload/files/28025566649.pdfIn PDF document text
    • http://holmeslawfirm-iowa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/46341464302.pdfIn PDF document text
    • https://keralahappyjourney.com/ckfinder/userfiles/files/mekumododiwu.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/file/tinizete.pdfIn PDF document text
    • http://pilot-market.ru/new/files/file/makunijijibelujedebilo.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/161454d7e12054---xurerevakosidi.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ba8f78cdfe.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/161350f89f318e---pewegutipanotikepewudawe.pdfIn PDF document text
    • http://studiotecniconuti.it/userfiles/files/32355776816.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/93363608452.pdfIn PDF document text
    • http://brukbet.com/user_images/file/14635776193.pdfIn PDF document text
    • http://progettogeometra.it/userfiles/files/86525799136.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_off0000b43d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB43D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC54 10232 bytes
SHA-256: def9cf0f1ace3197af2267c919196619d230f250afcf625216098c6492b4de65
font_02_sfnt_off0000e350.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE350 17024 bytes
SHA-256: 72583c7e550c25acdc128bcc6ebb7f2a7520e4737e6ad91b3401c94c75e016a4

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