Malicious PDF — malware analysis report

Static analysis result for SHA-256 32983316138f81e5…

MALICIOUS

PDF

89.2 KB Created: 2021-09-04 22:45:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b14e476a26fa7b5b522d1c9a6753bd72 SHA-1: 73e78fda9dcc8416482c0c35b925b70d1da178f3 SHA-256: 32983316138f81e5a90accc7f88d92d7f5c316f41b2557a587e3695d0529505b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting it functions as a link farm designed to redirect users to malicious or phishing content. The presence of external URIs and link farms points towards a phishing or content-luring attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://coretry.ru/uplcv?utm_term=2017+irs+form+qualified+dividends+and+capital+gain+tax+worksheet PDF link annotation
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/c9572ea1a922d540d36a8f28f26568fa/76956949509.pdfIn PDF document text
    • http://staceyasp.com/UserFiles/file/vaxejomuwug.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/24308303640.pdfIn PDF document text
    • https://muzeumkonstancina.pl/attachments/file/beponenipobos.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/31275376227768d271c94383bd0c31fa/77869552692.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607222b76f2f3---vorafati.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/160861144dd791---nakakadimufune.pdfIn PDF document text
    • https://pelletier-tp.fr/ckfinder/userfiles/files/62741719538.pdfIn PDF document text
    • http://boekenwinkelindex.nl/images/uploads/funikixatoj.pdfIn PDF document text
    • http://www.letnifestiwal.pl/ckfinder/userfiles/files/81300594426.pdfIn PDF document text
    • http://www.pics4us.de/userfiles/file/83941465651.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609807935e425---tefaxoreme.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ec9dcf061d4---lexoxumumere.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160750da417efc---zakamu.pdfIn PDF document text
    • https://klcmekatronik.com/ckfinder/userfiles/files/6742723551.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6a88985ff00ae807e580d889b2be6861/kipokipamunum.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1608aae6eed18d---megujesateg.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/7urtli7ogliunjsrgi12reu440/54445655589.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160e1eec85450c---47355692662.pdfIn PDF document text
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/f5fb48cc91c962b93a39df99d5e80260/xuraxebefiguvapejiw.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/6590678315.pdfIn PDF document text
    • http://donkaew-furniture.com/ckfinder/userfiles/files/gaxurevuvugazefun.pdfIn PDF document text
    • https://economiadecomunion.net/ckfinder/userfiles/files/91551478108.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_off0000f4cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4CD 17736 bytes
SHA-256: 605c0b6ed4907e05e4d952435019b549e034746465bb738179acff41b1dcfc51
font_01_sfnt_off000122ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013ac4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AC4 11908 bytes
SHA-256: 32032c51f4c578a2b50d56775f40e0da34d008fa7ee649964309706a3058d8be

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