Malicious PDF — malware analysis report

Static analysis result for SHA-256 af2481f64797483f…

MALICIOUS

PDF

95.1 KB Created: 2021-09-07 22:14:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 81268944aa00c49d537e29fc56485fb2 SHA-1: 5e2bdcd0da6f2f3012e3731eac2f4470933070a7 SHA-256: af2481f64797483f06ee7fcec78ab0207db3785a8af32dbddad72340b8bdf3ca
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to websites, many of which are hosted on compromised WordPress installations or disposable domains, indicating a link farm designed to distribute malicious content or phish users. ClamAV detection and ML classification strongly suggest malicious intent. The document body is heavily obfuscated and unreadable, preventing further analysis of its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9897

Heuristics 6

  • 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.
  • 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://synerhu.ru/uplcv?utm_term=responsabilidade+social+empresarial+teoria+e+pr%C3%A1tica+ten%C3%B3rio+pdf PDF link annotation
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/mt592hrvgo1s79chtb6begro6r/55837833343.pdfIn PDF document text
    • https://proxus.nl/file/xajuruvomedexupikurov.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/161338fdac1473---76458155258.pdfIn PDF document text
    • http://newo.ru/files/files/megogurafopivaweli.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160a4cde87bd38---tikajokadal.pdfIn PDF document text
    • http://cortabellanews.com/userimages/fuforukeragalozi.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a70bc5ba8fd---44313595437.pdfIn PDF document text
    • https://www.varisistanbul.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070a41d1a0e8---72966491670.pdfIn PDF document text
    • http://babyschultz.com/clients/72285/File/38496245817.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/d67419b7451c66e45e6111767aefc1cc/71578423529.pdfIn PDF document text
    • http://apexhealthnutrition.com/newerac2c/userfiles/file/zajodir.pdfIn PDF document text
    • https://korovin.org/site/img_ufiles/25736684344.pdfIn PDF document text
    • http://transbur.ru/admin/ckfinder/userfiles/files/vilowek.pdfIn PDF document text
    • https://98ing.com/upload/ck/files/20210815_014601.pdfIn PDF document text
    • http://praguetransfer.com/files/file/letomokakojo.pdfIn PDF document text
    • http://southport1969.com/clients/861680/File/fenasudidar.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608072ba9cef2---tofutasewovowenuzewul.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5ab14fc8e21a64fb1281b02d56d93121/kelemez.pdfIn PDF document text
    • https://aathichudi.org/userfiles/file/10177673650.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/21479239439.pdfIn PDF document text
    • https://harkakotony.hu/UserFiles/file/13681912361.pdfIn PDF document text
    • http://gianniarnaudo.com/userfiles/files/43958852145.pdfIn PDF document text
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/436e86174d4e68387a0f3ed3c5e8f10d/xuwalax.pdfIn PDF document text
    • https://study4student.com/cache/fck_files/file/lukipolovebovaxirajobul.pdfIn PDF document text
    • http://nomorecpapmachine.com/userfiles/files/63364196093.pdfIn PDF document text
    • https://tkquiz.com/userfiles/file/9986890182.pdfIn PDF document text
    • 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_off00010421.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10421 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011c33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C33 20768 bytes
SHA-256: 5681c6d125d318f8e473b005614ecc256da55d21797a938058b1aa95123374f3
font_02_sfnt_off00015108.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15108 11284 bytes
SHA-256: b693f29e806ebc199f872f35125d8a47af332e523a66ddf3ed6209cf4368ef1c

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