Malicious PDF — malware analysis report

Static analysis result for SHA-256 9716bf475e7712d6…

MALICIOUS

PDF

83.9 KB Created: 2021-07-08 00:38:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 6a2285357a7bbdd8ed36654da6f161e0 SHA-1: 0a43a68ee4541a59afe387d4bbf088e0e7470581 SHA-256: 9716bf475e7712d6da730f9cc8c6b04e4dc179ec339c728196c3b9afeaa73add
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites. These links form a link farm, suggesting the document's primary purpose is to redirect users to potentially malicious or phishing content. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9766

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/bc3bdd6c8ab81e43216f988ca837894c/62447071638.pdf In PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/c2752ddb5991e4f249dfe9119a2818f6/ninapoxilupitekimex.pdfIn PDF document text
    • https://lavaecucebrescia.it/file/jotunabuxuj.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608567fac86ba---jidinutorekupanelum.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/vixabolanezavopebiwo.pdfIn PDF document text
    • http://buchtel1967.com/clients/26382/File/28945573862.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d65464064bd---lumetimodivakewurevol.pdfIn PDF document text
    • http://phuvuongcorp.com/luutru/files/sotarat.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bffdff21ac5---43261634400.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d88c7fa8ae3---31551913592.pdfIn PDF document text
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/5c94e6369013cca38e0b76bba33aa5ce/1089399060.pdfIn PDF document text
    • https://fotofidelity.cz/userfiles/file/15519389760.pdfIn PDF document text
    • https://lentes123.com/aym_image/files/toxos.pdfIn PDF document text
    • http://irina-beha.com/ckfinder/userfiles/files/51184171024.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160812bd9cc146---toseniwavofekejutojukibu.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1ea652f7a8---67626545279.pdfIn PDF document text
    • https://lasanisports.com/files/kasumofugabiwabufuvere.pdfIn PDF document text
    • https://dolnoslaskialarmsmogowy.pl/imgturysta/files/7778407469.pdfIn PDF document text
    • https://mimpishio1bet.net/contents//files/sokurave.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fee5b6e077---66355255967.pdfIn PDF document text
    • http://magnachip.cn/userfiles/file/20210521233117.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d0940f2c964---26624042449.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c1505007f51---mopowudesesagulibuki.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/a8521306810085d5598cacea04850e23/53685571813.pdfIn PDF document text
    • https://superchills.com/userfiles/file/22243258596.pdfIn PDF document text
    • http://htwy.com/upload/file/93510849223.pdfIn PDF document text
    • http://arserwood.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210707085612482682bg97nl.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=referee+meaning+in+englishPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cb67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB67 16060 bytes
SHA-256: 8bfc5e2f6383778b4716e60c732a7e5228106b692ca52c1f6b3c0b2892049825
font_01_sfnt_off0000e076.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE076 18696 bytes
SHA-256: 01ec7c0bf8b4eb537e95eb429919073edd1f077250aa255e46f020df7b8e00ed
font_02_sfnt_off0001121b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1121B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00012a32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A32 10488 bytes
SHA-256: acd95a421a0f1855fa95304cd2d2a5e75b21d8029b0065f10be9eeb87bfee3ad

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