Malicious PDF — malware analysis report

Static analysis result for SHA-256 a31f3a8fd298a1c0…

MALICIOUS

PDF

76.3 KB Created: 2021-09-01 01:50:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9dfc7809d669edef363e314853b4f265 SHA-1: b9c732c6e1982465a37600e2b39fb6eb475ad670 SHA-256: a31f3a8fd298a1c0c38cc62bda6bb9ca28485627b7578d8ad657eeeb1b9d0c3b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, forming a link farm. The embedded JavaScript likely facilitates the redirection to these malicious sites, which are used to distribute further payloads or conduct phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://wastran.ru/uplcv?utm_term=hello+darlin+by+scotty+mccreery PDF link annotation
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/shtqn0q89fm3arijicna8br3r3/54716875347.pdfIn PDF document text
    • http://canigrup.com/userfiles/file/suzaxusumejawaninad.pdfIn PDF document text
    • https://promaxsuspension.com/csmimage/file/82708614854.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b46a716c1d2---37987709126.pdfIn PDF document text
    • http://status.cz/UserFiles/File/dukezefovozobokedozugiwo.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7412f3690f---80200467881.pdfIn PDF document text
    • http://pamatudarbai.lt/ckfinder/userfiles/files/medikinuradurodumisapo.pdfIn PDF document text
    • https://h1t-urlaurora1-turbo.com/contents//files/49295926821.pdfIn PDF document text
    • http://tsradviseurs.nl/mailing/images/photo/file/17604543087.pdfIn PDF document text
    • http://xn----dtbsgbucafmmaf.xn--p1ai/servimages/editor/files/9549105883.pdfIn PDF document text
    • https://oliogalanis.com/file/fevujogenikabuven.pdfIn PDF document text
    • http://bibliotekaludwin.pl/img/upload/files/28613482705.pdfIn PDF document text
    • https://oriental-kitchens.com/userfiles/files/nuxawabibikumadevigulu.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc7d95293f---43004829733.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/tdj4vvfifkodm6perjfvtfenv2/90523521233.pdfIn PDF document text
    • http://ibtaker.ps/userfiles/file/tuwadutamumi.pdfIn PDF document text
    • http://wami.cc/data/files/74998671220.pdfIn PDF document text
    • http://kimhoatra.vn/upload/fckimagesfile/lokuxajimodu.pdfIn PDF document text
    • http://russkiivopros.com/images/FCKeditor/file/ritijinedovajuwekabu.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/34d77a206565799003a7cdc840e8ac1f/8957017640.pdfIn PDF document text
    • https://skatrip.com/basefile/skatripcom/files/27486734354.pdfIn PDF document text
    • http://ameshamagazine.com/js/upload/files/39034975980.pdfIn PDF document text
    • http://doctour.hu/uploads/ckfinder/userfiles/files/69156133242.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_off0000c3e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3E4 10776 bytes
SHA-256: 381c5eacd1ecd7b589cff417c2186a7319d0859af1b1f2526ad310f01d24209d
font_01_sfnt_off0000dca1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCA1 18180 bytes
SHA-256: 13821b9d796c6f393824004b2ca70104ef1f8e7b855e09da5645924ca338513a
font_02_sfnt_off00010b77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B77 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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