Malicious PDF — malware analysis report

Static analysis result for SHA-256 50c879cf740a336c…

MALICIOUS

PDF

82.7 KB Created: 2021-10-07 09:10:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 9dcffef5201c76f6b4d547565baa5308 SHA-1: d9d5a24d4b1afb87039bd84aad592c982227e0a1 SHA-256: 50c879cf740a336c11ce4f808ca009ac8f82fd0d37b31b1508068dd0bc2a182d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV detection as a phishing trojan. It contains embedded JavaScript and numerous external links, some pointing to compromised WordPress upload directories and disposable hosting, suggesting an attempt to lure users to malicious content or download further payloads. The presence of embedded JavaScript indicates a likely intent to execute malicious code upon opening.

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://summitremodelinginc.com/userfiles/files/duvajikud.pdf In PDF document text
    • http://855solution.com/htdocs/cljr/data/files/fazegekawomebulidiluk.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614d9e873a622---83858670767.pdfIn PDF document text
    • https://www.playitdirect.ca/ckfinder/uploadfiles/files/difubez.pdfIn PDF document text
    • https://viessmannboilers.ca/fck_upload/file/dexafukenabibaxow.pdfIn PDF document text
    • https://weekendtripskolkata.com/userfiles/file/viwuzejuru.pdfIn PDF document text
    • http://krajinar.cz/soubory/files/titofe.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/ba11edeb6564d8ec142b221cd82cf955/karuvutis.pdfIn PDF document text
    • http://pn-tech.net/userData/board/file/64392321625.pdfIn PDF document text
    • http://donkaew-furniture.com/ckfinder/userfiles/files/remudarumazov.pdfIn PDF document text
    • http://sportschoolindex.nl/images/uploads/81910868496.pdfIn PDF document text
    • http://jatyn.cn/upfiles/202109/file/1631146478.pdfIn PDF document text
    • https://norservis.info/files/files/zodabofatejagafo.pdfIn PDF document text
    • http://keletunderground.hu/images/uploaded_pics/file/41605224088.pdfIn PDF document text
    • http://hitplus.eu/userfiles/file/59929559048.pdfIn PDF document text
    • http://www.msjcongregation.org/www/js/ckfinder/userfiles/files/dizukiw.pdfIn PDF document text
    • https://artistprasanna.com/userfiles/file/fawitokuvegutixijag.pdfIn PDF document text
    • http://lisaarkin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jividunumoxaxew.pdfIn PDF document text
    • http://gorod-r.com/userfiles/file/juxarejuvafiw.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/vobewekevotejusirenomefus.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16153ff4ce683a---xonovobosopofur.pdfIn PDF document text
    • http://jogagongu.pl/userfiles/file/pefenaxivaguweli.pdfIn PDF document text
    • http://orvosvalaszto.hu/uploads/files/67129124729.pdfIn PDF document text
    • https://xn--80aesyq.xn--p1ai/files/file/wiropoxuxod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=how+do+i+turn+off+alerts+on+my+phonePDF 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_off0000d7d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7D8 11056 bytes
SHA-256: c976537bcca2bec5ca8103a1ebccc77c4634b99f5220066efb6a5c04bba7ef7c
font_01_sfnt_off0000f164.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF164 19388 bytes
SHA-256: d5b8c89e3b464cdb51d1b56efc9e54c024355762dd31977cf28f73d0a6ae255f
font_02_sfnt_off000124f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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