Malicious PDF — malware analysis report

Static analysis result for SHA-256 312ee52ef24985c3…

MALICIOUS

PDF

72.5 KB Created: 2021-09-18 10:02:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8c9b46257732f0545a09eebcc7815416 SHA-1: 0caa55a4b79d74f65efae55ff90844e35e9b08ea SHA-256: 312ee52ef24985c36770b07feec399e7a40999f776a926d94b9603da20bbc5a0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous URLs, many of which are part of link farms hosted on disposable domains or compromised sites. These elements suggest the document's primary purpose is to lure users to external sites, likely for phishing or to download further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9940

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://infrive.ru/uplcv?utm_term=how+to+use+android+phone+as+a+hotspot PDF link annotation
    • http://happyorderfood.com/uploads/files/93004086782.pdfIn PDF document text
    • https://castel.ro/userfiles/file/legasipililolebanani.pdfIn PDF document text
    • http://tsrmmessina.it/userfiles/files/42819181077.pdfIn PDF document text
    • http://cbcom.fr/ressource/site-image/files/bovetedivotatekol.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139be0c1a384---25876730746.pdfIn PDF document text
    • http://redemaisfarma.com/userfiles/file/69185743533.pdfIn PDF document text
    • http://commsoft.nu/demo/ktb/wsmbilder/files/kezawifu.pdfIn PDF document text
    • http://ettorebelfioreliutaio.it/userfiles/files/83527786399.pdfIn PDF document text
    • http://sapthagireesyathra.srikarpagavinayagamills.com/userfiles/file/53040871049.pdfIn PDF document text
    • http://epwuae.com/userfiles/file/89510445930.pdfIn PDF document text
    • http://vitalchurchesinstitute.com/files/file/83524196997.pdfIn PDF document text
    • http://orthopaede4you.de/userfiles/file/libotagizuwewememibafuse.pdfIn PDF document text
    • https://pharma-tools.eu/galeria/file/xesemamoguxedo.pdfIn PDF document text
    • http://networkinglikepro.com/ckfinder/userfiles/files/vuzovevulepejupuzug.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d7aa286908---14059363485.pdfIn PDF document text
    • https://cordovajewelry.com/images/file/72490138251.pdfIn PDF document text
    • http://stellarp.com/userfiles/file/54262601315.pdfIn PDF document text
    • http://www.oe.com.tw/ezadmin/ckfinder/userfiles/files/28042018396.pdfIn PDF document text
    • https://ibrahimkoc.com/images/Media/files/34585428023.pdfIn PDF document text
    • http://theonejsc.com/userfiles/file/73534517886.pdfIn PDF document text
    • http://dspec-car.com/js/upload/files/73352784634.pdfIn PDF document text
    • http://telekommarketing.com/firme_data/files/84340497560.pdfIn PDF document text
    • http://thaoduocvn.com/userfiles/image/file/97864974530.pdfIn PDF document text
    • https://xenang-mitsubishi.com/fckupload/file/10791679388.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/b934aaae81f0f1ed4ac510c98980280f/8260893142.pdfIn PDF document text
    • http://julianowka.pl/ckfinder/userfiles/files/65620636562.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_off0000bdd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDD7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d5e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5E9 14972 bytes
SHA-256: fc4e3c1f0cea439de2b5104cc9a47d93306dc2bc619d59d157de0d546c345a2c
font_02_sfnt_off0000fba1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA1 10620 bytes
SHA-256: a09b221c46e3bd454dbbbe0439ac28201fbfbab90c985d77b298619fde28b0c0

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