Malicious PDF — malware analysis report

Static analysis result for SHA-256 c95cd0ae3847be43…

MALICIOUS

PDF

71.2 KB Created: 2021-10-01 04:13:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: b01ad95b698c32cd1eb43244e5588e55 SHA-1: 12e42fa381a5e85afcf5b1e503f27c80e2cba7e1 SHA-256: c95cd0ae3847be43ec5592f42c346a1440517415069a476cecbb5331db0af716
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and link farms pointing to compromised websites and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of multiple PDF link farm heuristics reinforces the attack pattern of directing users to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://queure.ru/uplcv?utm_term=subway+surfers+apk+game PDF link annotation
    • https://megalight.lv/uploads/files/wetakegavotigok.pdfIn PDF document text
    • https://songhong.info/userfiles/file/59225226425.pdfIn PDF document text
    • https://krassimirtaskov.com/userfiles/files/95899811302.pdfIn PDF document text
    • https://kotata-zlin.cz/obr/clanky/file/faxosawavoj.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/990b42c558083f8fafaf4e8ef0999533/41374852017.pdfIn PDF document text
    • http://canphantich.net/Images_upload/files/36594229638.pdfIn PDF document text
    • http://oguraclutch.cn/uploadfile/files/92695997300.pdfIn PDF document text
    • http://18554080.com/userfiles/file/18462818607.pdfIn PDF document text
    • http://medob.org/SITE/files/editor/file/5297374500.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aa4f1b25ee---14842127703.pdfIn PDF document text
    • https://khachsan295doson.vn/namthuan/images/news/files/62575663546.pdfIn PDF document text
    • https://habibitours.com/ckfinder/userfiles/files/37390678900.pdfIn PDF document text
    • http://gemculture.com/userfiles/file/8857731699.pdfIn PDF document text
    • https://mclandpin.com/calisma2/files/uploads/89266930940.pdfIn PDF document text
    • https://nepalihemp.com/ckfinder/userfiles/files/talotodere.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/bk7c1smsd41vofsmq99p99lcb5/ruvugugajum.pdfIn PDF document text
    • http://internet-trade.eu/UserFiles/file/fogidajogasigowiwuwib.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1614c88b731bb7---89379310016.pdfIn PDF document text
    • http://toyotarent.hk/FileData/ckfinder/files/20210921_8CD84E68E08F278C.pdfIn PDF document text
    • http://media-production.net/admin/ckfinder/userfiles/files/15614032909.pdfIn PDF document text
    • http://seednseed.com/admin/fckfiles/file/jobapibureg.pdfIn PDF document text
    • https://cursosadistanciayonline.com/medios/files/1714367432.pdfIn PDF document text
    • http://kapalishakti.com/ckfinder/userfiles/files/geximikifezelo.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/dbmbb86p4ercjcho73it44adpp/28547003077.pdfIn PDF document text
    • http://bjjiffy.com/upload/tozagalejagedulabu.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_off0000b287.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB287 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA99 17388 bytes
SHA-256: 1fad6971f73a6c13d2de7462e38ea639e45c92bc83c8ab3820c141734c352d59
font_02_sfnt_off0000f6a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6A0 10848 bytes
SHA-256: 47848da2a9b8da3d2046f435b92b74a7b7733e7681ed1f2a4e6986d15912599f