Malicious PDF — malware analysis report

Static analysis result for SHA-256 b70ad1a703370522…

MALICIOUS

PDF

77.1 KB Created: 2021-09-10 07:50:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e1dd1decf14cf13026f8188407a4003c SHA-1: afb4c0dba55d0b14b0868fc2f8374f1d8ca2426b SHA-256: b70ad1a7033705223db570fcf93105d746f1a225645419fa4408daade9ae3559
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' indicate a deliberate attempt to create a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://crysiq.ru/uplcv?utm_term=in+the+mood+for+love+stream PDF link annotation
    • http://footstepfloor.com/upfiles/files/79516348322.pdfIn PDF document text
    • https://ipekyolumedya.com/resim_galeri/file/56381500463.pdfIn PDF document text
    • http://machi-tomo.xyz/js/ckfinder/userfiles/files/koxesigobonomu.pdfIn PDF document text
    • http://studiolorenzoni.eu/userfiles/files/mewofe.pdfIn PDF document text
    • http://www.gc-antey.ru/ckfinder/userfiles/files/27402518773.pdfIn PDF document text
    • https://radmangroup-ye.com/rgfiles/file/51907401529.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/16138f3acb7776---tawoge.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131b90c6f36d---6830720509.pdfIn PDF document text
    • https://vmgeducationtrust.org/home/vmgedu/public_html/public/userfiles/file/99991676497.pdfIn PDF document text
    • https://hoya.hr/UserFiles/file/66027042552.pdfIn PDF document text
    • http://armanetti.com/images/22484774369.pdfIn PDF document text
    • http://graficaeformazione.it/userfiles/file/voxejarumujamovoziz.pdfIn PDF document text
    • https://dakotaterritorydevelopment.com/ckfinder/userfiles/files/48015921776.pdfIn PDF document text
    • http://phoiinnhiet.com/images/uploads/files/malezigikomevomo.pdfIn PDF document text
    • http://jungvassar.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/janatutavofule.pdfIn PDF document text
    • http://gabident.pl/local/userfiles/file/55284936580.pdfIn PDF document text
    • http://topimmigrationlawyer.org/ckfinder/userfiles/files/31157842064.pdfIn PDF document text
    • http://ptairsupply.com/userfiles/file/daselugokubu.pdfIn PDF document text
    • http://ilkemymm.com/image/files/lepovidip.pdfIn PDF document text
    • http://ibookingkr.com/FileData/ckfinder/files/20210904_681E4A6890F62844.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/6210971d00bf685b8897f28a234bb11c/muvamodidogaweforisazuzik.pdfIn PDF document text
    • http://magooferta.pl/uploads/fck/file/vovezenamivumedu.pdfIn PDF document text
    • http://phuwangnam.com/user_file/file/84171192436.pdfIn PDF document text
    • http://mebel-moscow.com/content/xuploadimages/file/42340349209.pdfIn PDF document text
    • http://studioarchterreni.it/userfiles/files/74556637235.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_off0000ca68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA68 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e27a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE27A 16996 bytes
SHA-256: 9c6ecde417cecac42c8018965d96dd3b90495b9c490d63b5018e1efc2dd4b108
font_02_sfnt_off00010ebd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EBD 10544 bytes
SHA-256: 414ffcea3cb3f8b1e9417a7575b90bf1459b45e8cf7f3ec1848e726bf07c4e30

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