Malicious PDF — malware analysis report

Static analysis result for SHA-256 afcdbe6cd82a2101…

MALICIOUS

PDF

81.1 KB Created: 2021-09-19 12:56:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: b82ba1d42c3ccfc16587d4373992a613 SHA-1: c2011a9add2456ca3f2bdb1087600af792dfa613 SHA-256: afcdbe6cd82a210177671538a3215eeab333dc82e26f70f4404ba3aec7cbcb07
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, with several heuristics indicating a link farm pointing to compromised CMS uploads and disposable hosting. ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious sites, which are designed to host phishing content or distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://101doctor.com/uploads/ckfiles/files/6134b8276730f.pdf In PDF document text
    • http://toyteepee.com/uploadfiles/file/210906135408892178wdxib1.pdfIn PDF document text
    • http://autolavaggiocraparotta.it/userfiles/files/wefoziwivulosubogogaw.pdfIn PDF document text
    • http://oresteruggiero.com/userfiles/files/finarojetujiso.pdfIn PDF document text
    • http://influences-vegetales.eu/assets/Image/files/52385829288.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/161404f2375c42---sixexemo.pdfIn PDF document text
    • http://mamnonkitty.com/webroot/img/posts/files/dalagokotedalufeparuso.pdfIn PDF document text
    • https://maharajganjtimes.com/assets/ckfinder/core/connector/php/uploads/files/38224875844.pdfIn PDF document text
    • http://flapboxes.custompackageboxes.com/userfiles/files/33610314417.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ee00108504---pepisugobidovorepebiweru.pdfIn PDF document text
    • http://ashole.hu/UserFiles/File/vezuvesutone.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/kivavetepufejeji.pdfIn PDF document text
    • https://limberhurstgallery.com/imageuploads/file/fejudew.pdfIn PDF document text
    • http://wcsps.com.tw/ckfinder/userfiles/files/90091667530.pdfIn PDF document text
    • http://tunglamgarden.com/images/fck/file/kewafubofuj.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210905045710226.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613937b95c6e0---rajekazo.pdfIn PDF document text
    • https://artistprasanna.com/userfiles/file/mumipajuwerukopifuwevaxa.pdfIn PDF document text
    • https://shunnasato.com/buresegebafifemiluvuti.pdfIn PDF document text
    • https://iphone-odklep.si/vsebina/lerututijagajakolaxu.pdfIn PDF document text
    • http://agriturismocorteerbatici.it/userfiles/files/lidazabifoguvugugofusa.pdfIn PDF document text
    • http://mesterteto.hu/userfiles/file/59298163394.pdfIn PDF document text
    • https://www.theoakshealthcare.com/my_content/js/ckfinder/userfiles/files/desosuruzimaliwewuderu.pdfIn PDF document text
    • https://nguoixunghekiev.vn/userfiles/file/74892693455.pdfIn PDF document text
    • http://lsneotek.com/ckupload/files/xinubovokakosenemunejoni.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/0829c996a7c9d61fe05c7e41718f1259/sakexu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=gta+san+andreas+cheats+apk+androidPDF 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_off0000d8ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8AD 17436 bytes
SHA-256: 1c351e1cb8663724d52c6d63f56a52afc8fe4c057d00c0f28f827a5c83dfece7
font_01_sfnt_off00010580.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10580 10696 bytes
SHA-256: 6f23695ed2f0d6da710f219d6ecead409ed7cc98153585652db4a450ecb3c2b7
font_02_sfnt_off00011e02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E02 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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