Malicious PDF — malware analysis report

Static analysis result for SHA-256 b097ddf5d27cf86d…

MALICIOUS

PDF

68.7 KB Created: 2021-09-27 05:11:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 290dd0f6f983eb3a259de42baa637b4d SHA-1: 9ce8bfebdcb8b24bafa2bea8ca01a9c12a0db84c SHA-256: b097ddf5d27cf86db9374d6ac188f678328af8b930c7c6a2f28508dd99f550fa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the PDF acts as a link farm, directing users to multiple external websites, some hosted on compromised CMS uploads. The presence of numerous unknown URLs suggests a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614d70ca8a3b7---42037352265.pdf In PDF document text
    • https://amthanhanhsangchinhhang.vn/upload/files/46418623197.pdfIn PDF document text
    • http://laconchigliacasevacanze.it/userfiles/files/65893648860.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/16149735fb5a52---duwipekovuxepipi.pdfIn PDF document text
    • http://claudiamelchior.it/images/file/98732194608.pdfIn PDF document text
    • http://gurolmumcu.com/userfiles/file/55983745598.pdfIn PDF document text
    • https://citronel.com/userfiles/files/71135937346.pdfIn PDF document text
    • https://toliveinchristjesus.ceosale.catholic.edu.au/application/third_party/ckfinder/userfiles/files/vodulugudan.pdfIn PDF document text
    • https://avistravel.ro/userfiles/file/ruzavovi.pdfIn PDF document text
    • http://moscowprice.com/content/xuploadimages/file/ledalerisa.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/f5d482c1c63c61076a753911239eeee1/7463786696.pdfIn PDF document text
    • https://egokituz.org/files/galeria/files/24082911706.pdfIn PDF document text
    • http://rorolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/15344747276.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613e3dbc7c0d1---26696544275.pdfIn PDF document text
    • http://etkindenetim.com/resimler/files/vatadume.pdfIn PDF document text
    • http://vncdata.net/app/webroot/uploads/files/difalusinodu.pdfIn PDF document text
    • https://vinocastillo.hu/editor_up/nisozepu.pdfIn PDF document text
    • http://heldermusic.nl/ckfinder/userfiles/files/vosigojuxixevulanasedene.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613170c140ef6---bumaziralafezunakum.pdfIn PDF document text
    • https://iringmalaysia.com/ckfinder/userfiles/files/74003391287.pdfIn PDF document text
    • https://pnp-studio.com/fckeditorfiles/file/xelewolulezidozebo.pdfIn PDF document text
    • http://jplus-ag.com/upload/files/BodyFile__61464E42C5856.pdfIn PDF document text
    • https://xetnghiemadndanang.com/upload/userfiles/files/rurosefakenujagujunofeven.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=battle+chasers+nightwar+apk+downloadPDF 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_off0000af38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF38 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c74a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC74A 14556 bytes
SHA-256: a0b7412f08738561a695fff52470b869a22e7368797094589c3e0499bbfbd305
font_02_sfnt_off0000ebd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD1 11024 bytes
SHA-256: 9976835721a91b374fd4abbe9960fc53fc0d08cb485f28dc1135ba7f6f4cd832