Malicious PDF — malware analysis report

Static analysis result for SHA-256 10088b7fe7a76587…

MALICIOUS

PDF

94.3 KB Created: 2021-08-19 10:02:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7407fa5b942c99839fa9ac26ce2ba38d SHA-1: 750d2cfe968f00d14b4a5584525043ff6f9f888c SHA-256: 10088b7fe7a76587e580378621a2c0408862cb811da72f8a38e2e56c7529f25d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised CMS uploads or are part of a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9876

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://crysiq.ru/uplcv?utm_term=car+racing+games+unblocked+google+sites PDF link annotation
    • https://le27.fr/docs/file/kamiwedanasol.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160abe99cdaa6d---zopizinozutavuduxaguziw.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/16084176c93b5f---76968856183.pdfIn PDF document text
    • http://zonwering-belgie.com/ckfinder/userfiles/files/xebakoxisixanugoziki.pdfIn PDF document text
    • http://sakuragiramenandsushi.com/uploads/files/zetoj.pdfIn PDF document text
    • http://www.toeterloeh44.de/files/zebigejinese.pdfIn PDF document text
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/o9pb1d18lghmgrvmqp0vr3p663/51750492941.pdfIn PDF document text
    • https://saleskerala.com/ckfinder/userfiles/files/22776029801.pdfIn PDF document text
    • http://trunglam.vn/uploads/userfiles/file/sazuperef.pdfIn PDF document text
    • http://xn--vb0b83rba554gca.kr/page_data/file/20210617193107.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/161045cdbe3c6e---tiveminanupozu.pdfIn PDF document text
    • http://abpaluso.com/upload/file/1358574894.pdfIn PDF document text
    • http://duepassidalcentro.it/userfiles/files/werol.pdfIn PDF document text
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/53401e7c14230677d60a0d15ea07b384/gobogodejunisago.pdfIn PDF document text
    • http://www.velkoobchod-man.eu/ckfinder/userfiles/files/babetovoxi.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1609cd68499174---12366375903.pdfIn PDF document text
    • http://cosyromania.com/media/file/dulirawuxalekemo.pdfIn PDF document text
    • http://sincaremedicaltour.com/js/upload/bazizifurapo.pdfIn PDF document text
    • https://www.wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/wokajuwudegamasumuze.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1232e84c4e---sikagofigerudonemetupefup.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/e3f455b56b13f1d9a96a0941da0841fa/gimorujekofifusev.pdfIn PDF document text
    • https://tdfstore.it/file/rikosetoletasemazivavelo.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160774f5653ac8---26477170417.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/qgiac86q5csbq3flqklkcfg3r7/80329217222.pdfIn PDF document text
    • https://oteaexpert.fr/cite_imgs/file/97580558152.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/a46db912ddadd2fa7e3f04d613b9fb1d/31019400651.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_off00010ad4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AD4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000122eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122EB 11076 bytes
SHA-256: 9488ff10491d1bbfffbe889d18ad9df37f8007a7795f2ab064b4fa104ffa2a4c
font_02_sfnt_off00013c86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C86 16788 bytes
SHA-256: 19280be20761963f1ea2961959cb07b377b659f2f89f51fbfa4dbf54bf8f83d3