Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b50b859dd585a18…

MALICIOUS

PDF

84.1 KB Created: 2021-09-16 20:38:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 615ebf3e15edb1b06554378dcd751b85 SHA-1: cc864a32f8aca0e0041200370be4294a93a7c636 SHA-256: 7b50b859dd585a18c9e67b05879d8edaf3b2898aa01f3699a648773bcaaefc7e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many hosted on compromised WordPress sites, suggesting an attempt to redirect users to malicious content. ClamAV detection and ML classification strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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 https://wastran.ru/uplcv?utm_term=baixar+jogos+snes+para+android
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613192fd81545---goduvarapenesupagiviwer.pdf
    • http://fasson.vip/images/editor/files/kozozivu.pdf
    • http://k2plusinterior.com/userfiles/882046751.pdf
    • http://gnatowski.pl/attachments/file/tisufixaloxemiwaxoguri.pdf
    • http://jingkangchem.com/upload/files/gubadisabovivibalirorug.pdf
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/bd6086423a18198056f012666bad3d2c/72077437375.pdf
    • http://xhzhengli.com/upload/pumumuvugapifofumasemisuv.pdf
    • http://dkind.net/userData/board/file/fejasaf.pdf
    • http://blekinge.boj.se/uploads/userfiles/files/4220563274.pdf
    • https://holcom-wd.com/webroot/img/files/puworufenewosuvo.pdf
    • http://nathulaldasptti.com/ckeditor/ckfinder/userfiles/files/36442986940.pdf
    • https://ice-group.pl/userfiles/file/zumekotuxuxurebarezug.pdf
    • https://mmszke.hu/files/file/82035604853.pdf
    • https://www.jnvhardoi.org/ckfinder/userfiles/files/16171850057.pdf
    • http://hublihorse.com/uploads/userfiles/files/labupakaxesawonawuduf.pdf
    • http://cadelupo.it/userfiles/files/56207924556.pdf
    • https://wasael.com/userfiles/file/72543361686.pdf
    • https://www.barefoothoa.com/webroot/js/ckfinder/userfiles/files/nefuxitumodaxupurelenuzu.pdf
    • https://stop-remont.ru/ckfinder/userfiles/files/83935506240.pdf
    • http://baohanhranghm.com/upload/img/files/ladukononekinodofizejo.pdf
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/161395ec959635---femimago.pdf
    • http://2446665a.ru/ckfinder/userfiles/files/64332950641.pdf
    • https://kingdomofgodmn.org/userfiles/files/39882096039.pdf
    • https://zenithoverseas.com/assets/userfiles/files/rezovamu.pdf
    • http://linpus.com/app/webroot/userfiles/files/77879562489.pdf
    • http://energo-winstal.pl/userfiles/file/69235542352.pdf
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1613ffbb0aa639---vizozarizan.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd70.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDD70 16792 bytes
font_01_sfnt_off0000f587.bin
63020dbfb80eccbc6de8dee9478416c52ba81893380d1a8ae3bf02867fa9a30b
pdf-font-stream PDF embedded font (sfnt) at offset 0xF587 10708 bytes
font_02_sfnt_off00010dfa.bin
0f70546ec6bb4155e16153877f04593e305681ba80c3af1105a3964a90f037e9
pdf-font-stream PDF embedded font (sfnt) at offset 0x10DFA 20676 bytes