Malicious PDF — malware analysis report

Static analysis result for SHA-256 17b31d226b16fb3c…

MALICIOUS

PDF

85.8 KB Created: 2021-07-02 05:38:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: b539dbf0a2e9e1b3d9a8a159c8f0c53c SHA-1: 1b4c806d046a84bc40b2612a041fcdd3be34392a SHA-256: 17b31d226b16fb3c6ddfcc3f046bf1fe5d59948c7b0314d784e404cc574f9651
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or malware distribution attempt. It contains numerous links to external websites, many hosted on compromised WordPress installations or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics strongly suggest this document is part of a phishing campaign, likely using spearphishing attachments as the initial access vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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://synerhu.ru/uplcv?utm_term=fred+vargas+have+mercy+on+us+all PDF link annotation
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/e332b8eea5629d86cad2299884f4ade5/80836636605.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/5ddd5a0e16869601134bbf26aa997430/gagirewubixe.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c1c576d7d2---78333529082.pdfIn PDF document text
    • https://pinpointfeedtech.com/ckfinder/userfiles/files/toxobub.pdfIn PDF document text
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/51306058323.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160b2bf776063b---jidexelewowafesalija.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1608ccf96326ba---rexivajezan.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb777109d8---17754507656.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/9366d580b548a9f3d8ad37684d112ed7/lawewufutogofufisikipid.pdfIn PDF document text
    • http://porpora.eu/imagenes/imagenes_contenidos///30902449106.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c976a60ed4---67053295707.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/79127225490.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b16f2294908---xatanomesidemikotuxovivil.pdfIn PDF document text
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/sgrpb7bmrdi41gs85ib004eamc/23602443872.pdfIn PDF document text
    • http://teenmag.cz/userfiles/file/kofesekikopalutemavuvetu.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/14eb69c349088768ac9c69b450455920/rafevarelirebonulirisu.pdfIn PDF document text
    • http://vivaibonomo.it/userfiles/files/4874076740.pdfIn PDF document text
    • http://obrienbuilders.com/userfiles/file/mamodirulix.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/5c2bc3b48b2c7b02012f6ce335e0e338/89391989994.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/f4ee87529c940670170db2b562f72b8c/lopipobezutuzopibuxobi.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/57500479819.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160911a03ee594---zutizevunogug.pdfIn PDF document text
    • http://fairway.cc/images/blog//file/nabidibafupowopijoge.pdfIn PDF document text
    • https://schmitz.cz/res/file/51600849915.pdfIn PDF document text
    • http://xn--9w3b11kh5l.com/ckupload/files/94590771177.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/3b0b4587b83bef0d9e5262ab4a75254c/61329643666.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_off0000eac4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAC4 17820 bytes
SHA-256: 21acf16bd076724a42624d45a053046d614db4dd114a31d74151713a0da7b373
font_01_sfnt_off00011903.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11903 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001311a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1311A 10884 bytes
SHA-256: 5500e12aa19e7ff3712740e98123ac89e7ef054a7f525923d59976acb74808bc

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