Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfb98622c2379366…

MALICIOUS

PDF

97.8 KB Created: 2021-06-25 20:08:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1ee5922940f364ab19e2179e36f7d9c7 SHA-1: 0b32af8ad6b20e0c9978bff650828e6b038bd65c SHA-256: dfb98622c237936619028481600ac062aea2aefa7d8d7337f4464392d619d3af
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, so the primary attack vector appears to be social engineering via link redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9784

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 http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a333cde236e---96930460057.pdf
    • https://aravlicraft.com/cmsCart//upload/file/tajadurume.pdf
    • http://phukhoabacninh.com/images/files/latusa.pdf
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/309e283c311018de3c1c2906f24a2d36/36223673712.pdf
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/17ba618fa4762ceaf5e8537a9d753c64/situmisukunurode.pdf
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608e8cef5a24c---wawuzowutogo.pdf
    • http://www.reenactmentmarket.eu/images/wyswig_images/file/5582703790.pdf
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5712d99f84---wutoxepawizenaxala.pdf
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/hqb5qs9cqkrs0esalobvh96s57/wutefojasudosawe.pdf
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5785a6eca5---29139068853.pdf
    • https://webfox.net.au/wp-content/plugins/super-forms/uploads/php/files/14bb5c6e5a69fa62239384f618f9ffcd/53313002481.pdf
    • https://bangprice.combangprice.com/beta/cms_image/file/gaxesi.pdf
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/0a61bdf2f5720a13853df5b66f8f4e87/11881944765.pdf
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/20457a6df7bd83cd87254e2e2804378c/fopaledogeremesivabomij.pdf
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5d8789679---1160626277.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160b3a4aa295d2---vinesadolitumunekat.pdf
    • http://fotografiafrancescosomma.com/userfiles/files/55068167475.pdf
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/06edac373a6415667df8929d46cf9703/72794886640.pdf
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608c5bd162f23---77460414832.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c21773d65f9---vagateli.pdf
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/3fd6upj5npi22vj1fep29587a8/mifatawep.pdf
    • http://getem.eu/files/file/xefekukufuroxijivexisono.pdf
    • http://greenbiotech.vn/uploads/userfiles/file/56996278961.pdf
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160819e3134584---rewodujewudezojoxodoza.pdf
    • https://boucherienabli.com/uploads/FCK_files/file/jisidujalavenujuv.pdf
    • http://johncarroll1967.com/clients/1/18/1896e795ecc2602204d707ec4e69586f/File/72119341993.pdf
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca89506c0f---jowutumi.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=marge+simpson+french
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011c4e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11C4E 16792 bytes
font_01_sfnt_off00013460.bin
7896b566034fde014f4933dee06f85be40a50316ce1bf83882b53f11ca448aa3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13460 17284 bytes
font_02_sfnt_off0001611d.bin
4841361e50ce29ff77e41b6d20fd77f0e1f08e1fda3cd2c543597f84da606417		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1611D 10776 bytes

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