Malicious PDF — malware analysis report

Static analysis result for SHA-256 22ef4b8214839a57…

MALICIOUS

PDF

86.3 KB Created: 2021-07-12 16:26:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: c7611c81ffae3b02274758668642e7ce SHA-1: cb6ac4363008992f7341cf5abb040c055897c864 SHA-256: 22ef4b8214839a57ba823f6bb8e2fb68901e3f253bd154287c22b30be031db14
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including ML classification and ClamAV, indicating malicious content. It functions as a link farm, embedding numerous URLs that point to compromised websites or disposable hosting, likely intended to lure users into clicking through to malicious destinations. The presence of external URIs and link farms suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • 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.
  • 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://irlanc.ru/uplcv?utm_term=slow+cooker+appetizers PDF link annotation
    • http://billedbutikken.dk/articlefiles/file/44937467804.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/9c26933d5aeaa20b6ffb0e350981c515/73057330525.pdfIn PDF document text
    • http://ordineveterinarivenezia.eu/userfiles/files/37487908359.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/0be0e09476072a5502ac662df9c86d9d/56734786491.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d080eaac552---29739112434.pdfIn PDF document text
    • http://woods-china.cn/ci2/userfiles/files/20210607020951.pdfIn PDF document text
    • http://colorfusion.us/admin/images/file/jewexa.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/048bgvt6c77q25p4ogosqt3p42/fidulozijozuro.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/de8a96dff8cf9926bbbec0bc14b97f3c/89158971517.pdfIn PDF document text
    • http://shsalumniauditorium.org/clients/f/fa/fa32e32112b7cad64a7d7e78b95ed61b/File/galur.pdfIn PDF document text
    • http://isgsrl.it/images/file/gafeluperufamovif.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c793ce1a70e---maxagivaw.pdfIn PDF document text
    • http://fotografiafrancescosomma.com/userfiles/files/zirasog.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160d6cb242efa8---67952415335.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4db67d9a2---97529114570.pdfIn PDF document text
    • http://www.knickmeier.net/images/pageimg/file/rejojimasurodimumise.pdfIn PDF document text
    • https://xuantruongtech.com/images/ckeditor/files/1587502793.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608378fbc7ebc---43573890205.pdfIn PDF document text
    • http://chargers68-50th.com/clients/3/3d/3dd154274af4887fbe356f6dcfc18689/File/dijugoletesujopivizodomix.pdfIn PDF document text
    • http://maslag.eu/userfiles/file/midotajezapadewawabem.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609fcffa955e0---nemimisa.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/womiwulebudodoligivugitox.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/874a22b8eb228592e2a51487ecca4a90/81241705430.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da216090ee1---pixinolegatojorasubor.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_off0000ef09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF09 17220 bytes
SHA-256: ab64f302e07b41ef38f03246a97c0cd613a1288269e46b3807d57e8c40c5dcaf
font_01_sfnt_off00011bcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BCB 10576 bytes
SHA-256: 404fb9076a72e7d1170748adb5e61d4815c120aa02dea9fe7c66a758a6b64d05
font_02_sfnt_off00013432.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13432 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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