Malicious PDF — malware analysis report

Static analysis result for SHA-256 41a00ac93f92e7db…

MALICIOUS

PDF

77.9 KB Created: 2021-09-05 16:50:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ab919e960c92fa5690c9338d15b2f328 SHA-1: 0736252b964b4e911fb24611a2780fed6762ffd3 SHA-256: 41a00ac93f92e7db09ec5278efc11a15dfe125dffc352efb56e32e5dc6100d2a
156 Risk Score

Malware Insights

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

The file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple compromised websites, some hosted on disposable domains. The presence of numerous URLs, including those pointing to compromised CMS uploads, strongly suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://crewmak.ru/uplcv?utm_term=excretion+in+annelida+pdf+download PDF link annotation
    • https://tvsporedi.si/vsebina/50971502818.pdfIn PDF document text
    • http://thekreativecompany.com/uploaded_files/userfiles/files/sapasiwanuzaledadag.pdfIn PDF document text
    • http://uitvaartverzorgingsindex.nl/images/uploads/18714854508.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1608289ee8df58---53447686448.pdfIn PDF document text
    • http://www.microsinusectomi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7eb8ca460---84583682549.pdfIn PDF document text
    • http://ruihuitax.com/files/file/43362646126.pdfIn PDF document text
    • http://webcertain.net/contentupload/fckeditorUploads/organization_/file/37126248760.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/161072c0c17cb5---16364608657.pdfIn PDF document text
    • https://bluebeakbranding.com/wp-content/plugins/super-forms/uploads/php/files/fc094a0b0a1111014eaaa664d517e8fd/89260176389.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/baef185d6fbeb7eebb34a005bd46acc4/39201671970.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/2apva6g45ju0vp16qnokhl0kt4/65889696115.pdfIn PDF document text
    • http://kartywspomnien.pl/uploads/assets/file/65120450625.pdfIn PDF document text
    • http://rubensova16.cz/files/file/37619416050.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb4241a0a01---vozuxom.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/pkkvko8r7bdu5urfn67bh0gse5/sutom.pdfIn PDF document text
    • http://salon-urody-bellis.pl/images/file/rakotunabazufevo.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/kj3vdq5ukibdjhf4lfnd6ft88i/jojisoparofoxojuj.pdfIn PDF document text
    • http://alexanderkanevskyartistbiography.com/clientMedia/file/jinogajosafidurusaguzen.pdfIn PDF document text
    • http://hy-concrete.ru/d/files/tivomonij.pdfIn PDF document text
    • http://struttur-arch.it/userfiles/files/naxuvozenirikimazusu.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/wegexugezajenolozojefa.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160b8f749ea490---60393072545.pdfIn PDF document text
    • https://andana.us/files/files/86918823357.pdfIn PDF document text
    • http://closehorses.com/userfiles/file/kuvodagadeduz.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16120e272a105c---43936213948.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_off0000ca94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA94 17976 bytes
SHA-256: ebbeaf4b519fd35e87917cbf5c1bd6e3a2dc2fd153f497a4ac0819a2f3c9fe4a
font_01_sfnt_off0000f90a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF90A 10616 bytes
SHA-256: cf19e1541213f365d110f3088b0d730aa6670e5e2030bc510c0721b5f7b904e2
font_02_sfnt_off00011178.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11178 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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