Malicious PDF — malware analysis report

Static analysis result for SHA-256 82eafff5e65bdde9…

MALICIOUS

PDF

107.6 KB Created: 2021-07-20 05:49:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 7cb495da23722daee76c81fe658eb298 SHA-1: acf8eb64dc7644a9e6ac99995bbd4a15dd81a411 SHA-256: 82eafff5e65bdde9ed86b41235ee5e03605ffbf0060bcae6a73e04cb3435b877
176 Risk Score

Malware Insights

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

The file is a PDF identified by ClamAV as Pdf.Phishing.Trojan. Heuristic analysis indicates it functions as a link farm, directing users to multiple external websites, some of which are hosted on compromised CMS upload directories. The ML classifier strongly supports the malicious verdict, suggesting a high likelihood of phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/s9n3rhb2u0rue53k5jem5k4rej/50457462769.pdf In PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/j54dkec01vbbl5a6msniek6kfu/63821449345.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/16078a1dc75572---41266160697.pdfIn PDF document text
    • http://www.ochoadentalcare.com/tacgestorcontenidos_ochoa/documentos/file/In PDF document text
    • http://omgmediatank.com/userfiles/files/70441911062.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087c96e5a452---41564416088.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/lcft500pa3bkvitjevges0hqo2/63266717683.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/9bf2d25bb90ac23e8eddf6276fe462b6/wevopupovepititewus.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/d5f966effefb4901a86b76380e379aa5/62811070652.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607c3cb4e789b---22945244316.pdfIn PDF document text
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/d542ee70498e0dcce131e35a71763df7/78122209002.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608e6e01a88ca---27805518916.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/hv642auq06246p6a542ioh4448/dogawuwitipodovofojalifov.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609ff58eab113---21770985966.pdfIn PDF document text
    • http://bortran.com/upload/image/file/20210525043735.pdfIn PDF document text
    • http://55pluscommunityspecialist.com/userfiles/files/43325548980.pdfIn PDF document text
    • http://timandlor.com/userfiles/file/16984682513.pdfIn PDF document text
    • http://mulroyenvironmental.ie/userfiles/file/vapuzatoki.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/65cd86f94095695f9e559e90109d79e7/pebomedinamazexos.pdfIn PDF document text
    • http://xdata.pl/app/webroot/img/ckf/files/83936909854.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/gipimegelukexukizexet.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160bf51d81e15a---dafiwexoxariboxowunivaxof.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a27095db85a---gulobozirevipefi.pdfIn PDF document text
    • http://xn--o39a91gvwm83kbsn.net/FileData/ckfinder/files/20210618_25F6AC01CB43BA05.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=international+journal+of+tourism+research+pdfPDF 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_off00013f65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F65 18224 bytes
SHA-256: df98424c3ed5823ec8f69e39aa480ce5bf4dc8a4f875a920d9c54d019a0eaeb4
font_01_sfnt_off00016f06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16F06 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001871d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1871D 11068 bytes
SHA-256: b0040273268d967983e518186631962c8c96afc5350bb72c10d891b21d605836

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