Malicious PDF — malware analysis report

Static analysis result for SHA-256 2175ebe601433b60…

MALICIOUS

PDF

67.3 KB Created: 2021-09-04 02:06:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f95102a9355131f10635389b4247d3c4 SHA-1: e6dcce0bca4e10d4f2bc8e866d159b0200fdab26 SHA-256: 2175ebe601433b60ff5a4590f23ec675ca3c129777df278476b301acc6af0817
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file is identified as a phishing lure due to its small size and image-heavy content, typical of a screenshot designed to trick users into clicking a link. Multiple heuristics indicate the presence of a link farm pointing to compromised CMS uploads and disposable hosting, suggesting a phishing campaign. The embedded URLs lead to various domains, many of which appear to be compromised WordPress sites used to host the malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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.
  • 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://we-plus.tw/ckfinder/userfiles/files/76177077271.pdf In PDF document text
    • https://ckmandarin.com/uploads/liluguramuxez.pdfIn PDF document text
    • https://vatlieutaphu.com/upload/files/duligofadajudu.pdfIn PDF document text
    • http://sotel-perm.ru/site/file/52024369172.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/fdd76dfc3a463b62a3f369d994fd1141/wesurasabarapuxuwiru.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/2e98b3a8f040ad10bf63b8ed4abfdf16/xawatozo.pdfIn PDF document text
    • https://agrimal.pl/userfiles/file/gapuvowezoj.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/9pehlia92mrmiv787hss7dru49/zefaf.pdfIn PDF document text
    • http://victoryelectricalsupply.com/ckfinder/userfiles/files/49990842308.pdfIn PDF document text
    • http://coyada.com/up_images/up_images/niwojutogijazofovijuxanun.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/29b0b07268a71905f86b93c0f65b3dc8/47418117829.pdfIn PDF document text
    • https://primer-spb.ru/files/files/15983928633.pdfIn PDF document text
    • http://vistobrasil.net/uploads/file/98446826069.pdfIn PDF document text
    • http://myagreement.com/UserFiles/file/zugiwavupowis.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/3emuqucpoqtqchra2eo80amrd6/kodotuzojelakirojesudu.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/37266f1592850f94816843a161384428/gujutusumoj.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/r8c38rahjqle8kv90s8sv9n2k6/xigos.pdfIn PDF document text
    • http://ceskylakros.cz/userfiles/file/9556729116.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c858f6f3c8d---88195810712.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/inv6jdit6pr5vn5ef7vjceaeg0/pesovikebobovazuzexasod.pdfIn PDF document text
    • https://bitree.com/ckfinder/userfiles/files/97804258243.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=icd-9-cm+coding+manualPDF 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_off0000af9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF9D 13252 bytes
SHA-256: 20e49d837447a315a36d7b89f872003de513445a320e6258e459e17fadefc406
font_01_sfnt_off0000d028.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD028 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e83f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE83F 10468 bytes
SHA-256: 2c9e8264bc9f25160ce928a41cd95f711129cf3a7d967099e7f5ec6b3eba2707

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