Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc736e18d7f6386b…

MALICIOUS

PDF

79.1 KB Created: 2021-07-15 09:44:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0f0577eefdaee171166f9066835b78d8 SHA-1: 80dd71bbd777ab7e0b61431ca6963e0823f597e9 SHA-256: cc736e18d7f6386b7fc60e1ed56ae27fda0a5c36cf39fcd28b22a6955820539c
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to numerous distinct hosts, many of which appear to be compromised WordPress sites. The document body is heavily obfuscated and unreadable, suggesting it's not intended for human consumption but rather to facilitate the malicious linking behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/bde2ed50c17225c5836e05bf9410e932/96590172412.pdf In PDF document text
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/vrpeidtvuil0t4h60dhl9ktsp2/51403190877.pdfIn PDF document text
    • http://hanarotalk.com/userfiles/file///92334518343.pdfIn PDF document text
    • https://deltagroup.bg/uploads/file/59650127068.pdfIn PDF document text
    • https://hizlipin.com/calisma2/files/uploads/5359561954.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160977d739a051---5712901783.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6a6d82748c---kewejatikogidu.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/6iarh5dsu34qnu0demo9hlaa91/xobawijirakolotivim.pdfIn PDF document text
    • http://myucmas.com/userfiles/file/17994012039.pdfIn PDF document text
    • http://parfumerieindex.nl/images/uploads/fomavut.pdfIn PDF document text
    • https://bustotoronto.com/userfiles/file/47356344286.pdfIn PDF document text
    • http://handlpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jodetopeladabejipitixorum.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606eff0797c92---90527784040.pdfIn PDF document text
    • https://harkakotony.hu/UserFiles/file/bojipameb.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8dbb852c1---wiroluwibesuwisidozejav.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/4f09f19b36e1b30c61ae2cea3296d385/69438738955.pdfIn PDF document text
    • https://snqrsl.quebec/upload/editor/file/28145168137.pdfIn PDF document text
    • https://www.mii.net/wp-content/plugins/super-forms/uploads/php/files/18dfda2ba36ce64e7e55dc54bfa80ac3/7030204136.pdfIn PDF document text
    • https://propactionvehiclesuk.tv/userfiles/files/27079839074.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0ed3dde227---xosaneluzuri.pdfIn PDF document text
    • http://duocmyphamcongty.com/app/webroot/uploads/files/2882686260.pdfIn PDF document text
    • https://patidarpalanpur.com/web/k/main_admin/ckfinder/userfiles/files/kokukadud.pdfIn PDF document text
    • https://ms01bet.net/contents//files/52505949861.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/lr8iuer4mfo3e2f8i1uqkfmtum/jagulovovanibetogega.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=west+wittering+things+to+doPDF 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_off0000d254.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD254 16932 bytes
SHA-256: 8897a8d864807b2e158f6f4029bca49314b709e6d5f47c516d4a09cc46c2aa5d
font_01_sfnt_off0000fe38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE38 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001164f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1164F 10400 bytes
SHA-256: 83cc03d8edc7dfce5457b4511385c30c3d929898bc38a06822670795761dd1ee