Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab425a937e83007e…

MALICIOUS

PDF

104.0 KB Created: 2021-09-04 13:07:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: cbb1879ab3d6f7f9aa9b7c8166d36c4f SHA-1: 39a1ca5b3ff7f96c9a52ee6a1a5830efd09ccf42 SHA-256: ab425a937e83007edffb5b3ab4085d118d54e5f080b430175a76ffb52ee011f1
192 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to download and execute a second-stage payload. The presence of multiple links pointing to potentially compromised or disposable hosting, combined with the 'Fake invoice / payment lure' heuristic, strongly suggests a phishing or malware distribution scheme. The ClamAV detection and ML classifier further confirm its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://tempegaring.com/contents//files/26682804139.pdf In PDF document text
    • http://stsmcc.org/www/js/ckfinder/userfiles/files/tikokiruzitafoniporomuze.pdfIn PDF document text
    • https://glaze-metalart.com/upload/files/jusopefavapupoxokivukoxuw.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609fdab206db7---60021261262.pdfIn PDF document text
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/fcb2314cc7f278f44fe0e9de6f94d0c0/pufutefixeva.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e112b080f2e---wizaminumexatasibedidusot.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608e624711a44---97225359165.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bacffcc9e29---15160183620.pdfIn PDF document text
    • https://condominiovillage.com/userfiles/file/93216816733.pdfIn PDF document text
    • http://gramercygrand.ru/files/file/23467505308.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2b97321c7a---85023504926.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/ee701833dcf40d3e245f3a7503fe218e/77243655953.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/q2pitjdq18f63ptb45p962i7re/losetelakewesa.pdfIn PDF document text
    • http://k1a.ru/images/files/file/filagojekiguxaribise.pdfIn PDF document text
    • http://westernmaki.com/uploads/files/23527660443.pdfIn PDF document text
    • http://mobilesamara.com/img/files/file/sapedegukodozew.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b77d741ca7e---84321715535.pdfIn PDF document text
    • https://patoman.ro/ckfinder/userfiles/files/potomazadomikowuf.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ad3e35997e2---pubokatibupep.pdfIn PDF document text
    • http://178.62.148.222:300/ckeditor/ckfinder/userfiles/files/radumemezesoxanozofilola.pdfPDF link annotation
    • http://dblbtech.com/userfiles/file/nirowujobekuto.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090042de0141---rizudiwutodimepuzilav.pdfIn PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/6643887d26b62dadf79a8ed2b5802c3a/60355592577.pdfIn PDF document text
    • http://mamtomchabahai.com/uploads/files/files/53612497057.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=coinco+mag32sa+bill+acceptor+manualPDF 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_off00012d14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D14 19264 bytes
SHA-256: 64d52944a5cfe289ccf160234369d6faf74dbde7a5d298f073e9126d5644dc0b
font_01_sfnt_off00015fc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15FC3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000177da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x177DA 11280 bytes
SHA-256: b2ec18f41d8fd279b951aef52b9ec76ac988b3c1cc6c04e7ce7fd8a88f407236

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