Malicious PDF — malware analysis report

Static analysis result for SHA-256 67f89e95cd368e36…

MALICIOUS

PDF

82.2 KB Created: 2021-09-15 20:03:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a1a1a8f7850b6e936cb3c3e9eb4cccff SHA-1: ad4214cff59558b25d20b2affb3b9e625a3da9e4 SHA-256: 67f89e95cd368e3647d5bfabd01bb5a42e83548dbc86f2cbe67238612eca8aa4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised WordPress uploads and disposable hosting, indicating a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious sites via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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 http://fsanaq.com/upload/file/210901192646277627xfp6wgwww05z.pdf In PDF document text
    • http://acudrved.com/ckfinder/userfiles/files/42190137641.pdfIn PDF document text
    • http://yishiweb.com/upfiles/files/20210908_221127.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614164cc6d990---dudurowapi.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///fuzojipamowagavolufavuwe.pdfIn PDF document text
    • http://onelove.cz/file/65396632976.pdfIn PDF document text
    • http://www.plan.msu.ac.th/ckfinder/userfiles/files/madovozorize.pdfIn PDF document text
    • https://birotex.rs/images/files/87481357990.pdfIn PDF document text
    • https://10playsolutions.com/clients/softklk/documents/_articles_/file/30850243951.pdfIn PDF document text
    • https://dcmheavyequipment.com/admin/images/file/sarovo.pdfIn PDF document text
    • http://allgeology.ru/ckfinder/userfiles/files/99184757905.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613c05ca98c66---49098849744.pdfIn PDF document text
    • https://hockeymro.ca/docs/file/89569663074.pdfIn PDF document text
    • http://tks-forever.com/upload/2021/09/11/file/xizadekogugopazazu.pdfIn PDF document text
    • https://sdhouse.info/ckfinder/userfiles/files/67145968919.pdfIn PDF document text
    • https://bankkartya.hu/js/ckfinder/userfiles/files/depuku.pdfIn PDF document text
    • http://sumtinathholidays.com/admin/uploadfiles/file/18428397317.pdfIn PDF document text
    • https://currenwatch.myhost360.cn/file/upload/files/09-06-00-28-20-49.pdfIn PDF document text
    • http://doremimarlikinsaat.com/userfiles/file/viriwemafixatatewo.pdfIn PDF document text
    • https://olivermilk.vn/tctt/sites/aaa/file/71761901224.pdfIn PDF document text
    • https://bleikss.com/userfiles/file/loxofuda.pdfIn PDF document text
    • http://prestinoequitacion.com/imagenes/upload/files/51290461026.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e4b5f4b9c9---84336224101.pdfIn PDF document text
    • http://tidomusica.com/uploads/files/202109040000248296.pdfIn PDF document text
    • http://xn--or3bo5mvlb.com/data/editor/file/33444818504.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/16138a0ca71f87---kexipesor.pdfIn PDF document text
    • http://indagosrl.it/userfiles/files/698016989.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=how+to+play+amazon+prime+video+on+android+phonePDF 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_off0000dcf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCF5 17396 bytes
SHA-256: cc67025be3ddcab3c33292c05e1d88dc848c4decf8d063fada5f8b622a85ce82
font_01_sfnt_off0001098f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1098F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000121a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121A6 10804 bytes
SHA-256: a677b583256641489c64b4de0ef506800c2b41ced0cc1ef650df46b0037bc2b1

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