Malicious PDF — malware analysis report

Static analysis result for SHA-256 08715ee44583be7f…

MALICIOUS

PDF

87.5 KB Created: 2021-09-01 10:22:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 99d96de4a09c8c8981dbbc6a677c0957 SHA-1: 5b95f064955462fb46c61ff2c6ce1d980a3d76c9 SHA-256: 08715ee44583be7fb0d1616c3c6d860a9b276c86f4670bb79c2eff6dcc02a0f0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, with the PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supporting the use of link farms on potentially untrustworthy hosting. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

Heuristics 6

  • 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.
  • 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://infrive.ru/uplcv?utm_term=example+of+callback+function PDF link annotation
    • http://www.asslar.de/downloads/fumufumedi.pdfIn PDF document text
    • https://sma-dfgg.org/site/admin/file/wigenujalimupatodanumizo.pdfIn PDF document text
    • https://digireg.it/upload/98472914888.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/losepurogoroj.pdfIn PDF document text
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086d6ef00169---mexabofo.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1ace125789---10439624843.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/16089adc0e10cc---rulira.pdfIn PDF document text
    • http://bbbswalkforkids.com/clients/c/cf/cf8d0549bdc9bbdffca8bc0db9808b96/File/54136083192.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/539188edf6bc2b5eb18269fe16e0b216/jimefodumimufaxajarevojaz.pdfIn PDF document text
    • http://ehs1958.org/clients/73155/File/94794187099.pdfIn PDF document text
    • https://cambodiaangkorhomestay.com/userfiles/file/84031088725.pdfIn PDF document text
    • http://juentai.com/userfiles/files/71094478096.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/gvkvpis5di2ootfur8f5cf5d68/10107586953.pdfIn PDF document text
    • http://m3hotels.com/userfiles/file/8838098891.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16100c4e638737---lajit.pdfIn PDF document text
    • http://simonide.org/userfiles/file/68986033578.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/4a1259b17a5e83b59b6719454185dce9/vijite.pdfIn PDF document text
    • http://orkoien.com/userfiles/files/62493673804.pdfIn PDF document text
    • http://wisewood50th.com/clients/3/35/35ca2b70ae131fa39667c240906a3fe4/File/lurewuxadakif.pdfIn PDF document text
    • http://10glazsikeyrosa.ru/file/pefokavexejij.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/970b2a54dfa7c405c055502ee6090d7e/34619202992.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/65bf92961084f9a121b448e72967e941/78747949814.pdfIn PDF document text
    • http://drironcat.com/images/file/11643980527.pdfIn PDF document text
    • https://myveolife.com/wp-content/plugins/super-forms/uploads/php/files/458afad436d11a9b5ef949eba88d6dc8/26752898388.pdfIn PDF document text
    • https://bawwabatrizq.com/userfiles/file/wifaxazuvuper.pdfIn PDF document text
    • https://protechlighting.com/wp-content/plugins/super-forms/uploads/php/files/54038c8ed9d04925f7db7ff1d83a237f/54294171015.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_off0000ecf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECF9 18796 bytes
SHA-256: 5f55005aa936265a4445d81423764ee98c768816447c0e04765c8693c4f97c2e
font_01_sfnt_off00011ea2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EA2 10792 bytes
SHA-256: 4b96518d5c95a099f25829ac6493c8200b9321e25036e7806f7de8bfa360f6a0
font_02_sfnt_off0001373d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1373D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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