Malicious PDF — malware analysis report

Static analysis result for SHA-256 02f1e5b76effb2e7…

MALICIOUS

PDF

76.4 KB Created: 2021-09-08 08:58:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b331bfc1e0f529c33f274aef5dfe8d70 SHA-1: ee947fd30a560182957321693fd2ce2d1f10ba61 SHA-256: 02f1e5b76effb2e79b2f5ab3f58239a577d9e2f70e6930a80649009f5fa274f3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm, with many URLs pointing to distinct, potentially disposable hosting domains, suggesting an attempt to obscure the ultimate destination. The presence of multiple compromised CMS upload links further supports a malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://100tmt.com/uploadimage/files/20210725163049.pdf In PDF document text
    • https://immo-cjeanpaul.lu/userfiles/files/rogorukimuxosovidupavokag.pdfIn PDF document text
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/njb7rlvl969hl18kqeso4hhpbl/31175022263.pdfIn PDF document text
    • http://gndpta.eu/news_objects/files/jamajadupob.pdfIn PDF document text
    • http://musikpark-live.de/userfiles/file/50067026023.pdfIn PDF document text
    • http://xhiehchin.com/Xhieh_News/_file/rugobuzoronoxujakid.pdfIn PDF document text
    • http://wallsfamilyreunion.com/clients/876683/File/fixevubewog.pdfIn PDF document text
    • http://toshiba-center.ru/uploads/files/36510167560.pdfIn PDF document text
    • https://arerp.kr/data/file///titokolopibamelapawaw.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/25a183600829206d1503a7fd3402cf6b/zedozaragalokebu.pdfIn PDF document text
    • https://orrizon.ru/images/file/jovujunalar.pdfIn PDF document text
    • http://hengtaixin.com/HangShun/ckfinder/userfiles/files/43772587641.pdfIn PDF document text
    • http://asclyziarskyklub.sk/userfiles/file/bavoxinirovex.pdfIn PDF document text
    • http://oio.cn/uploadfiles/files/ziwadomibejakojiz.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c21510a9fc3---40668300720.pdfIn PDF document text
    • http://yuanjen.com/ckfinder/userfiles/files/zowejugiduwesadolez.pdfIn PDF document text
    • http://bestbuyfromindia.com/userfiles/file/gunepakalipan.pdfIn PDF document text
    • https://adikkedua.com/contents//files/kebizuvori.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a91c89152f9---31541869907.pdfIn PDF document text
    • http://thailaundry.com/imgUpload/files/59657308031.pdfIn PDF document text
    • http://uleshuzatshop.hu/files/file/44821924920.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160901ff5907ff---88044899640.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/cfb76bce543230292a12d338654d6c80/sozadud.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085b09b22592---76541953968.pdfIn PDF document text
    • https://davidfauquemberg.com/home/fauquemb/david/bbdg_site/userfiles/file/92901336764.pdfIn PDF document text
    • http://sreema.org/FCKeditor/file/80929511779.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=octet+rule+and+ions+worksheetPDF 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_off0000c911.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC911 10772 bytes
SHA-256: 9affe516d73445c64925a2f14f87f7ceb344889ed9f745adc7d9a1b9ecdd5bc8
font_01_sfnt_off0000e1de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f9f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9F0 16456 bytes
SHA-256: 601b736530cefe586aa79f266a5e4a50fda13a36cb4f6c8160c9b5879f0fa9ae