Malicious PDF — malware analysis report

Static analysis result for SHA-256 920ff731142c04e8…

MALICIOUS

PDF

104.1 KB Created: 2021-06-27 19:29:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 565d4ff506f2b00ccc97c6fd432918d9 SHA-1: 2d1ac29e570b90eeb4f12e93db26e3656dda7db7 SHA-256: 920ff731142c04e86727d236afb514b37341acde14b8cfdee376091788a34ed1
156 Risk Score

Malware Insights

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

The PDF was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting. These links are likely intended to lure users to malicious sites for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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://residencecarlofelice.com/userfiles/files/24079693935.pdf In PDF document text
    • https://dietacud.eu/upload/file/tokozonu.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608b0559ab4a3---dupekelijugizirilobajogex.pdfIn PDF document text
    • http://mudrkanuch.sk/editor_uploads/system/files/32121901201.pdfIn PDF document text
    • http://czdashan.cn/uploadfile/file/2021051001130573499.pdfIn PDF document text
    • http://nhs1980alumni.com/clients/878257/File/15942552276.pdfIn PDF document text
    • http://mg001.cn/upload_fck/file/2021-6-11/20210611005628726463.pdfIn PDF document text
    • http://www.la-rocca.pl/app/webroot/files/files/2724183134.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/5re4rvvn25ljqdb3cmfptrq1no/fegakipubiselevubakoforev.pdfIn PDF document text
    • https://angkoronetour.com/userfiles/file/28761307499.pdfIn PDF document text
    • http://robertfeinberglaw.com/images/edit_images/file/54416929004.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b2698e850be---fogize.pdfIn PDF document text
    • http://aitrans.cn/UploadFile/file/F1202106100847373230.pdfIn PDF document text
    • https://xn--p3t29jo1ed4o4xw.tw/upload/files/77979039303.pdfIn PDF document text
    • http://kmkonsult.cz/userfiles/file/16039806814.pdfIn PDF document text
    • http://myafmc.com/clients/a/a5/a51d49d85de18111a3d718c63a5e5081/File/vevilomo.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a895a05b783---tuwubaga.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/0d6121e7b9897d0e1151e460b0204c9e/3339635686.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cdc77ec47a0---16240023570.pdfIn PDF document text
    • https://glbtrader.com/userfiles/file/29103853215.pdfIn PDF document text
    • http://stonebreaker.at/91624592214.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/520ae8ca76cb8ba1ba08c0208dc052c9/muzudogosafowato.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/29083088326.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ad0e5524bbe---fexewakupekilivatazamat.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/88bd7df47956bd52f473e1ade7b0efb1/dagew.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=unit+circle+trig+functionsPDF 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_off00013455.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13455 17704 bytes
SHA-256: dbf4286a3878e8f5f590eadbb3b82ed04a28603a4fca12334f47ef5922996e8b
font_01_sfnt_off0001630f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1630F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00017b26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17B26 10456 bytes
SHA-256: c35d006872927d414e0882001e92e05d807bab62dbb349bfe38bc89db4939aa9