Malicious PDF — malware analysis report

Static analysis result for SHA-256 5884eba5a6f08bba…

MALICIOUS

PDF

93.5 KB Created: 2021-08-04 02:09:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 13f9980892e05246e76c868da3f2cb3e SHA-1: a6c63c5feba5ff4852e8f5900bc7dd80ad17e6b7 SHA-256: 5884eba5a6f08bbad09c957b75769565fa3631492a9c31cd71ffa28b9cbb34b6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of these links and the overall structure indicate an attempt to distribute malware or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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 http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c20a859e83---salupobumapojapogifub.pdf In PDF document text
    • http://botosani.ro/img/uploads/file/piwuxurusenur.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160bfbb0807a81---posazenewol.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/664c838a0f78dbb967f601affb0f9c04/vutesimajifapebogodal.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-8-2/20210802195454919386.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/3a4f1fe3dc65fc3094f50ca957d8301f/pimetatesujiwon.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/3bie3ukrscfnh366dl54tg4s3u/30599135848.pdfIn PDF document text
    • http://logo4you.dk/userfiles/file/sotimegekosu.pdfIn PDF document text
    • http://paoladebenedetti.eu/userfiles/files/23703054230.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/9223b724dd3764e8328818d6ba3557bb/zobojagusuzijivonaxixala.pdfIn PDF document text
    • https://miguktour.com/FileData/ckfinder/files/20210613_9F500E1533A8602A.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084f484361c2---mejubulijijukanile.pdfIn PDF document text
    • http://aprendanow.com/wp-content/plugins/super-forms/uploads/php/files/50aacded63174c84719ff9392d3be282/bobegidipu.pdfIn PDF document text
    • http://dvarenda.ru/upload/file/42149616089.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/89b6c8aeeb26a00d929ed01a9cfd987e/vimekekamofugu.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/64023967111.pdfIn PDF document text
    • http://galeriejacqueselbaz.com/userfiles/file/86964068673.pdfIn PDF document text
    • http://digimaap.com/wp-content/plugins/super-forms/uploads/php/files/fafat7ejh07uh4kfdrl3q9k04t/19669478154.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/f78e9f5820997db3db46c13187e18efa/zanafazetozelukodub.pdfIn PDF document text
    • http://geoodwierty.pl/files/file/julofud.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/160a7f4cc616ee---wizagejopuxurenir.pdfIn PDF document text
    • http://www.yeosung21.or.kr/ckfinder/userfiles/files/1628029377.pdfIn PDF document text
    • http://wecans.net/_UploadFile/Images/file/mapuziwobulakusifaj.pdfIn PDF document text
    • http://enjoybowlramenandpoke.com/uploads/files/milomipelexis.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=bartender+guide+for+beginnersPDF 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_off000107e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107E5 10776 bytes
SHA-256: 5969fe4404c79c93c16b30a6967256355d77e644763d498a5e80a5fbabd78412
font_01_sfnt_off000120ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000138be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138BE 17292 bytes
SHA-256: 58e78e7d648f1465f65a0f6581590bcae4299bf78f735ac88bd51a276a9aced7

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