Malicious PDF — malware analysis report

Static analysis result for SHA-256 f337830c7f9cbf7c…

MALICIOUS

PDF

87.5 KB Created: 2021-09-04 22:16:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 5f990850e1b6fa022e850f7bd0b9d30a SHA-1: 35d241d9c4776ae1d5f4ac69afc3634644bbacc9 SHA-256: f337830c7f9cbf7c0027e1ee3063ec91a1dfaa6e937b65070a0a1b4cddad7e9a
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites hosting other PDF files. This suggests the document functions as a link farm, likely intended to lure users into downloading further malicious content or visiting phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 http://richardchong.com/userfiles/files/pilofezigugubatisinigoz.pdf In PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/16112cc55ab816---pedopesirotakosi.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160adc432f0323---bepigozibolafemowodeme.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/47371520018.pdfIn PDF document text
    • https://bititechnika.com/uploads/file/64564490014.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160700d83714cd---31371778034.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/3up44vn2ncf4rdff5kt2q210p6/21784901770.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/ptmsi10frqt6q7bcrkjc0ed26g/lewiz.pdfIn PDF document text
    • http://rjbmachinery.com/d/files/29796812362.pdfIn PDF document text
    • https://limsurempat.com/contents/files/7470723650.pdfIn PDF document text
    • http://steps4cancer.org/clients/a/a7/a78c374070a178914b502abaf3db82b8/File/57232772533.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8aff2144fc---wotudosuwotesixowela.pdfIn PDF document text
    • http://aep-tc.com/cache/fck_files/file/39614136706.pdfIn PDF document text
    • http://kovacsoltvaskerites.hu/images/file/90942476690.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/7a3d8bd106f89590b2cd2ee15a636a52/10292821947.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/1ep5l2k3bvga9449e104rrgq2v/nodovatomotonadovibawejez.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/a627e42d5103d1e41560261c2ecadacc/dunurulasebefow.pdfIn PDF document text
    • http://ukonlinedirect.com/userfiles/files/jutolesawuvapewuzirisol.pdfIn PDF document text
    • http://www.sas.edu.mn/ckfinder/userfiles/files/16222346341.pdfIn PDF document text
    • http://multi-accueil.fr/ressource/site-image/files/28422741745.pdfIn PDF document text
    • https://securityguardsupply.org/php/uploads/file/21000901086.pdfIn PDF document text
    • http://drkoopman.nl/cmsimages/file/savimedaxosuzapeb.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/67203961578.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160729003958c8---retamabudut.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/sidogu.pdfIn PDF document text
    • http://lapenya.cat/imgjovesnaves/file/rovakonubezoguvinikul.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=derived+quantities+and+units+pdfPDF 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_off0000f071.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF071 10640 bytes
SHA-256: dbf9a6e5b3bd1a8bd65c155b056532af39a7e41bd71247b8fb04dda79563e820
font_01_sfnt_off000108ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108BA 18116 bytes
SHA-256: f63a42dec11063418701a6bd04e6f43c9944b81b9d6957427a6f8329682d9c09
font_02_sfnt_off00013857.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13857 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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