Malicious PDF — malware analysis report

Static analysis result for SHA-256 8941a299b8489473…

MALICIOUS

PDF

82.2 KB Created: 2021-09-06 15:46:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4f99be2fabb0252280b68969997cf12b SHA-1: e1a537129392d3d1ed8dcaddcbb68f3b0e92a80a SHA-256: 8941a299b84894735c79e78d2a2cea68f936f4442ffeaeb3e7ef34fd3cb8da3a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, and contains embedded JavaScript. It also features numerous external URIs, many hosted on compromised or disposable domains, suggesting a link farm or phishing lure. The embedded JavaScript likely facilitates the redirection to these external sites, which are often used to host further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • 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 http://chanhungcorp.com/images/uploads/files/9237681157.pdf In PDF document text
    • http://yljx.cn/images/upload/File/13915381601.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160759b6176d70---lusugizifenilonevukatilam.pdfIn PDF document text
    • https://biomedchita.ru/imeg_master/file/71512334962.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160708ff09a04b---61935376517.pdfIn PDF document text
    • https://joebalogh.ro/imagini_ws/56864329022.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///55244253498.pdfIn PDF document text
    • http://kmkonsult.cz/userfiles/file/21882170536.pdfIn PDF document text
    • http://pk.mo/userfiles/file/tifulokovasuval.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160f0619dc139d---65761431235.pdfIn PDF document text
    • https://kheops-so.fr/ckfinder/userfiles/files/dasojafogivulexugarete.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/581135a509f25eff9ab788c6b4111ef9/vinitaxodexa.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16124de6d6a22c---82465877828.pdfIn PDF document text
    • http://www.haztartasigepszakuzlet.hu/pics/file/5515978600.pdfIn PDF document text
    • http://www.portofmiamitunnel.com/system/js/back/ckfinder/userfiles/files/80691531307.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/bsvfii7bvsmu9repsg9m676usc/pivobawemobixufufin.pdfIn PDF document text
    • http://obasekiestates.com/UserFiles/file/31853627448.pdfIn PDF document text
    • http://puntolinea.org/userfiles/files/64492383813.pdfIn PDF document text
    • https://lederstuehle-shop.de/ckfinder/userfiles/files/27586320987.pdfIn PDF document text
    • https://cvsc.co/userfiles/file/72911444014.pdfIn PDF document text
    • http://tokyosushilohaus.com/uploads/files/24724095074.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160947393ed201---59465915812.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/vixuxafukewagenu.pdfIn PDF document text
    • http://savitapiti.org/ckfinder/userfiles/files/buxijidinujazizun.pdfIn PDF document text
    • http://119hero.kr/userData/board/file/pevugovezoluwowujezuwoges.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=carburetor+circuits+pdfPDF 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_off0000ddf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDF2 10736 bytes
SHA-256: 17c47f4c6c41132895dff21e2ed439c96ee6da81cbfb5d31504586ec6076e9ce
font_01_sfnt_off0000f68b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF68B 17100 bytes
SHA-256: e173d6d8f33300396909f715fbc39d9593bbda7f8e6c5767d5685630883a93e4
font_02_sfnt_off0001230c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1230C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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