Malicious PDF — malware analysis report

Static analysis result for SHA-256 09b8483779ac7e1e…

MALICIOUS

PDF

87.6 KB Created: 2021-07-22 15:18:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 927ff3d1a25aae1ffcb6acf710088c8f SHA-1: a840127638ffcb9ec401fdb666aadd07d86aad1c SHA-256: 09b8483779ac7e1e4a46e62d5869c5524cfee80657c104925145ad2133973104
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics indicate it functions as a link farm and a callback phishing lure, prompting the user to call a phone number for various urgent reasons. While no scripts were extracted, the document's structure and heuristic firings strongly suggest it is designed to deceive users into initiating contact with a malicious entity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.
  • 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://nasikampung.info/contents//files/bogujepuxowegefetadoxalob.pdf In PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/8n6vnsjeg3jr6q8g1qj6fkhe23/ravafuvoxuwipo.pdfIn PDF document text
    • http://doverhighschoolhalloffame.com/clients/2/2d/2d76883e1086210ef8e2c43836b0327f/File/42538168340.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/6bj65380dfc2111o535cifkjo2/8891895013.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b37ed59565d---xajirikos.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/4rnp3n9ipubq6kp0rahk3ercac/22127030147.pdfIn PDF document text
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/9003526e79a0629fb0b1c66f387d93e3/luwukulomusuvexukawidebog.pdfIn PDF document text
    • https://lacaune.hu/userfiles/file/subatisunofurarojuxub.pdfIn PDF document text
    • https://asthasupermarket.com/userfiles/file/32231613066.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/u3jo1esfmdq4oq5roftdrabp7o/47196337290.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bf58a3c33bb---60786886291.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c95172d86c---11539588002.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a7ab197d83d---58489156338.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160941f031b841---63499859799.pdfIn PDF document text
    • https://sanaspinler.com/calisma2/files/uploads/88671284054.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/xezeruzifezopuwemikumuloj.pdfIn PDF document text
    • http://roocenter.ru/upload/file/19896980706.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/cacd86ecf88b196fd040bae69b8eed31/nuvujixazuxu.pdfIn PDF document text
    • http://bagliodeimille.it/userfiles/files/54418884999.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/7pbt0g155jqmmp22nqbhftnjkq/nivixenupafagi.pdfIn PDF document text
    • https://bilalyapidekorasyon.com/userfiles/file/kusojorigurutekivaj.pdfIn PDF document text
    • https://ijp2.com/contents//files/77319354520.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607acbaa46549---boxosaposenutabapuwixezi.pdfIn PDF document text
    • http://hasici-pristroje-eshop.cz/files/file/luluxifotugizap.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=math+solver+answersPDF link annotation
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/72dc93765af93ceb1bc7fae1e88a936f/5476024857.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_off0000f355.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF355 17600 bytes
SHA-256: 44dbc793e2a585f79f88e0e56870eaccbcbba7c5a764e7770bb100248e50a26f
font_01_sfnt_off0001216c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1216C 10260 bytes
SHA-256: baa00b7a748f60cc1ecab7cbcc5547439077f4faa566d676c41a6fc5b6bd3aa9
font_02_sfnt_off0001388f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1388F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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