Malicious PDF — malware analysis report

Static analysis result for SHA-256 85947faaef1ecd42…

MALICIOUS

PDF

83.4 KB Created: 2021-09-11 19:43:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0e4c3a50a06c7a308ec8a86c9e671076 SHA-1: 8d3bb43bd248f4d452dccac216feb622c94b7986 SHA-256: 85947faaef1ecd429496b13e3cf63d901fb32e42355e5551052ee79b61689a0c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF sample was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious intent. It contains embedded JavaScript and a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites. The embedded JavaScript likely serves to execute malicious code or redirect the user to a phishing or malware distribution site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134ade643e5b---34968537440.pdf In PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/e4e39bcf2c336298c4a03bea7b18f1be/pukejegozorut.pdfIn PDF document text
    • http://bandenplaats.nl/cmsimages/file/junubejab.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16138fde72e037---janikudarofodibunakavos.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/84cf9103dbe0d2ce59ab11ae376ecf47/2932972699.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161331e7533ce4---mitotijosijid.pdfIn PDF document text
    • http://trungtamsangloc.vn/uploads/ck_upload/files/ronazetimibowu.pdfIn PDF document text
    • http://valkexclusief.reviews/app/webroot/files/userfiles/files/46356342760.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ebd8806513---69029900833.pdfIn PDF document text
    • http://centrons.com/uploaded/file/72115002361318c2a2306b.pdfIn PDF document text
    • http://sochisushi.nl/survey/userfiles/files/16089210123.pdfIn PDF document text
    • https://graphicart.ro/fckfiles/file/diridanadedulimoxitoxi.pdfIn PDF document text
    • http://ort168.com/upload/ckeditor/files/2123803700.pdfIn PDF document text
    • https://maggievanostrand.com/uploads/media/file/91274498594.pdfIn PDF document text
    • http://alwaysshine.com/fileimage/file/dexepuperuratom.pdfIn PDF document text
    • http://tko.wavedev.net/img/files/files/8817499080.pdfIn PDF document text
    • http://abakus-routing.co.uk/ckfinder/userfiles/files/58373965454.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/16134d1afbe191---76163392073.pdfIn PDF document text
    • http://jeansresource.com/js/ckfinder/userfiles/files/25290969972.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/d55ad5c8299d1d697ce86285a571c014/79917083294.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1613021389b274---93010702681.pdfIn PDF document text
    • https://indiantalentjunction.com/milan/media/wijovixesofizaj.pdfIn PDF document text
    • https://sakkestadbil.no/userfiles/file/5362843288.pdfIn PDF document text
    • http://jiuxingchaoshi.com/uploads/file/081230251625.pdfIn PDF document text
    • http://itkaufmann.com/images/fckimages/file/2579443452.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/nocqgjjrv57rorskuhj25bbj0j/maxataxuzuwogon.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=janibcn+punjabi+movie+2019+chal+mera+putt+2PDF 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_off0000dacc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDACC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f2e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E3 11360 bytes
SHA-256: 43b2928f811d2bf68b795b1ce4f1e58e7feb0fbc0980e696992d2804c78e8884
font_02_sfnt_off00010d44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D44 19460 bytes
SHA-256: 305ae613827222c808d98ab99ddca9b3b438e088bd80fc2e6fd605d3bf86a0e5