Malicious PDF — malware analysis report

Static analysis result for SHA-256 565bc621f68c58cd…

MALICIOUS

PDF

77.6 KB Created: 2021-09-19 10:30:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8df5142f6ae1c43fc97612a8371be194 SHA-1: e691f290059246b3f1da0cabfedf43dd43456768 SHA-256: 565bc621f68c58cda1cb2f8070eb2c96903df17a6c8f762f66a37cbc2778c67b
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS platforms. The presence of numerous URLs, including one with a UTM term suggesting a lure, strongly points towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://irlanc.ru/uplcv?utm_term=how+to+boot+to+recovery+mac PDF link annotation
    • http://www.mezmat.ru/ckfinder/userfiles/files/latolifilek.pdfIn PDF document text
    • http://weforyou.it/userfiles/files/77793953419.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/fe1d4718b3fbbe4e9963d1bbb61f76ab/77587069622.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/an47e6s8n214nc5419h691hhgj/jinezil.pdfIn PDF document text
    • http://bentleyplemtech.ru/userfiles/file/nexazamajamadetoj.pdfIn PDF document text
    • http://studiopiergentili.it/userfiles/files/meniwiguvutura.pdfIn PDF document text
    • http://www.valathors.com/ckfinder/userfiles/files/21810741809.pdfIn PDF document text
    • http://elandtour.com/FileData/ckfinder/files/20210901_4A8BE2845100C716.pdfIn PDF document text
    • http://vector-mebel.ru/uploads/files/sesigugububeloxuge.pdfIn PDF document text
    • http://machinesupplier.cn/data/product/file/202194_192959_210.pdfIn PDF document text
    • http://tmacfashion.com/ckfinder/userfiles/files/zuzupisotepab.pdfIn PDF document text
    • http://munsusa.org/userfiles/file/20210917144457.pdfIn PDF document text
    • http://churchontherockuk.org/home/churchontherock1/public_html/userfiles/files/zusuzezanikovok.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/de977fdd885140965029bc71757b9809/44141884172.pdfIn PDF document text
    • https://b2bircruise.travflex.com/bot/ckfinder/uf/files/putufuparorobedavukazeji.pdfIn PDF document text
    • http://khaskhaan.mn/uploads/userfiles/files/zedezigenisomazigex.pdfIn PDF document text
    • http://perilatomsk.ru/ckfinder/userfiles/files/kosiveguzuposiguva.pdfIn PDF document text
    • http://hdurmuslar.com/images_upload/files/51822033048.pdfIn PDF document text
    • http://learnazia.com/fck/imagesfile/13534937056.pdfIn PDF document text
    • http://grafitym.kz/files/file/89183418398.pdfIn PDF document text
    • http://pushgroup.lv/userfiles/files/88117389849.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161402df9e031e---52495591748.pdfIn PDF document text
    • https://angkortaxiservice.com/userfiles/file/zeselesa.pdfIn PDF document text
    • http://kfgame.snailgame.ru/upload/files/20210914032039.pdfIn PDF document text
    • https://karapinarinsaat.net/userfiles/upload/file/16634368573.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_off0000caa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAA3 18108 bytes
SHA-256: 5615d1f422d95f486c629b2d63da64975afe8203af7d7e22847217d5dea5e783
font_01_sfnt_off0000f91e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF91E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011135.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11135 10380 bytes
SHA-256: aa87bbfbdb622d395e453c94740c14b7ab518e3bbccf5242c30e70ab68dd2ffb

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