Malicious PDF — malware analysis report

Static analysis result for SHA-256 821c3bb6d940c52a…

MALICIOUS

PDF

81.9 KB Created: 2021-09-08 00:22:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8567ca09a30939abe36ad225c2ff96df SHA-1: 30974740b6518bb3935f941a6158694019801422 SHA-256: 821c3bb6d940c52a8de6c9fdd64e55907226ece5624f0f2d67ebe09721979b4e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting an attempt to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/69fd4d0d6a20a4ce71bd96030969e394/26206923637.pdf In PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/2f50e79a899f99052f157e729d4faaa7/3999372504.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/ef77d301d77c51a143c60c029ffa7438/wazelabafotemir.pdfIn PDF document text
    • http://teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/lopukafafujapasotesur.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/160a2655539a64---kasizofitixatijo.pdfIn PDF document text
    • http://hoteldarim.ir/basefile/hoteldarimir/files/87946038680.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab7b7dd6393---59107416184.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/f8a0ecbe9dc41723ba4a08ddab403d93/5949032486.pdfIn PDF document text
    • http://ukrainski-rosyjski.pl/userfiles/file/57145644785.pdfIn PDF document text
    • https://mandarinkinesiska.com/userfiles/file/52932104657.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080aeec3b778---39848253079.pdfIn PDF document text
    • http://porpora.eu/imagenes/imagenes_contenidos///94657849939.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/depozunuzarelob.pdfIn PDF document text
    • https://euchebnici.com/img/file/48811167425.pdfIn PDF document text
    • https://bilegt.mn/userfiles/files/dimosu.pdfIn PDF document text
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/2b0ee8da869dd9d212d88e94c33b5a9d/rokikijametajisawosuwela.pdfIn PDF document text
    • https://sunrise-photon.com/upfiles/editor/files/tiwosijibele.pdfIn PDF document text
    • http://tetobox-budapest.hu/uploads/files/22294916952.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/sazarufopekipenarezija.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/50f38a98cde3188faba9e59d6d377365/79645431132.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/61034e3c058c2c274ea175f88c142d7c/dubutadowuwam.pdfIn PDF document text
    • http://lifecontinues.ru/images/files/fifoninetipezafotokavub.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/6e2lor1bgtj242f9oev7eqivhm/57465563619.pdfIn PDF document text
    • http://ofitecnic.es/files.ofitecnic/fck_up/file/27528007669.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=effective+communication+worksheets+adultsPDF link annotation
    • 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_off0000da6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA6A 11068 bytes
SHA-256: 476a08a6e7437102ba71323b8f5c5af57c5ad8e3dc87b6253f2d95b2e0de504f
font_01_sfnt_off0000f40f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF40F 17504 bytes
SHA-256: 237dd772588f28bccedb58ad0b0565b2c20d76dd62741af984eddaf379072f43
font_02_sfnt_off000121a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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