Malicious PDF — malware analysis report

Static analysis result for SHA-256 52f29144e38288a4…

MALICIOUS

PDF

84.2 KB Created: 2021-09-20 01:29:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 2b6129b3385765542ef1f8a9187db68a SHA-1: 54b817b796abc1850db6b79721b3f212159c97cd SHA-256: 52f29144e38288a45b96991c85cdb5660ce1f7b2776d0698a759616d474bbe40
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF contains embedded JavaScript and multiple links, many pointing to compromised WordPress sites and disposable domains, which ultimately redirect to a PDF hosted on an IP address. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to exploit vulnerabilities or deliver a secondary payload via the linked PDF. The embedded JavaScript is likely used to facilitate the exploitation or download process.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/161466cf914130---veposezoxaxowegurimawab.pdf In PDF document text
    • http://fueandhair.com/userfiles/files/90070283209.pdfIn PDF document text
    • http://178.62.148.222:300/ckeditor/ckfinder/userfiles/files/xuzuvodijal.pdfPDF link annotation
    • http://artwatch.ru/userfiles/file/dixanefenux.pdfIn PDF document text
    • https://www.premiumtrade.ro/ckfinder/userfiles/files/79663316182.pdfIn PDF document text
    • http://gzcil.com/uploadfile/files/3300632811.pdfIn PDF document text
    • http://www.euro-fly.eu/userfiles/files/82704376981.pdfIn PDF document text
    • http://pro-group.ru/userfiles/files/34787851375.pdfIn PDF document text
    • https://arrad.ch/modules/ck/ckfinder/userfiles/files/91721552887.pdfIn PDF document text
    • http://chistogood.ru/admin/ckfinder/userfiles/files/fevusimedik.pdfIn PDF document text
    • http://rc-modeller.se/images/file///buzikixiluwodikiwijewul.pdfIn PDF document text
    • https://nnkcreations.com/userfiles/file/gupup.pdfIn PDF document text
    • http://koreaseals.com/ckfinder/userfiles/files/42467660162.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/7fac6542b00bc5a3813edc056d6175b3/kunuto.pdfIn PDF document text
    • http://dogwarts.ru/sites/default/files/file/77363084713.pdfIn PDF document text
    • http://filtrydokoparek.pl/img/all/40426866657.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/1465899f16296a7997f2a024a02d8eea/41657568193.pdfIn PDF document text
    • https://fwstc.in/userfiles/file/lapopejemupigegel.pdfIn PDF document text
    • http://gd-weimi.com/upfolder/e/files/20210906185542.pdfIn PDF document text
    • https://cpc-serbia.org/js/files/35329973464.pdfIn PDF document text
    • http://alkanboya.com/files/file///loronugisapak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=drivers+samsung+android+usbPDF 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_off0000e220.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE220 10756 bytes
SHA-256: a6818ed535220e1fe61abc781812cdc008aad8262043b3f006891844a19f07ff
font_01_sfnt_off0000faa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAA3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000112b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112B5 18948 bytes
SHA-256: 7473e81bc794dfa46a176f66d7208322a6ac21355c8b3b067e3631cc1c330230

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