Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cb4a5f203feda64…

MALICIOUS

PDF

77.7 KB Created: 2021-09-05 02:06:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 71468efc8f51af35861d5645b3c61d78 SHA-1: ab9a027d8a44aa0b92cd495f473ed9cf8fea21f7 SHA-256: 9cb4a5f203feda64cdee6a90958ee8c561b4493af03dbd5ab5b0434ab9af5f25
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and a link farm pointing to compromised WordPress upload storage. The embedded JavaScript likely facilitates the download and execution of a second-stage payload from one of the numerous provided URLs, many of which are hosted on disposable domains or compromised sites. This indicates a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b554d9bb42c---8549123652.pdf In PDF document text
    • http://easyreturn.store/userfiles/file/ponudifigefudoboluka.pdfIn PDF document text
    • http://efuturesthai.com/uploads/files/dixuwewexulakazaf.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/b00a52615f79d0e37e3ba7ef7dad03aa/81708848662.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16070f87e9c7fe---92303193636.pdfIn PDF document text
    • http://cropscipublisher.com/files/upfiles/file/jupozulezipuwuwulifotazu.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/160beffa3b2944---vinovatimiruxu.pdfIn PDF document text
    • http://sns-russia.ru/userfiles/file/lixigarukuvexanofugaluj.pdfIn PDF document text
    • http://moristas.com/userfiles/files/69110177015.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160f59d919c7d1---zomegaw.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/zomoferelupadivibukevodob.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bb90919533b---sutuga.pdfIn PDF document text
    • https://reazfarah.com/ckfinder/userfiles/files/59554907709.pdfIn PDF document text
    • https://gimenezricarte-deltabogados.com/ckfinder/userfiles/files/30400334775.pdfIn PDF document text
    • http://anatolianlgs.com/userfiles/file/bapotonabilozefenip.pdfIn PDF document text
    • http://diversecityuk.com/userfiles/file/27815658513.pdfIn PDF document text
    • http://5lovestartw.com/CKEdit/upload/files/17981170928.pdfIn PDF document text
    • http://cogersquest.com/clients/f/f6/f6194b381802d71b6842d6160e8859b1/File/8020397887.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/39dec6252123ed0024de3a664b4202ff/mikopukurezikerodetuz.pdfIn PDF document text
    • http://taketty.xyz/js/ckfinder/userfiles/files/ruzikuvubepasub.pdfIn PDF document text
    • https://topclassgreenery.nl/images/file/58086940844.pdfIn PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/fe72f5093e2358b31be8b7414fd13cc7/gerubobijezat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=convert+pdf+to+machine+readable+textPDF 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_off0000c9d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9D6 11056 bytes
SHA-256: c82b1ca16a1aba559826293a230beb2d705dad798cfbf1acaef67dc575a9cbb0
font_01_sfnt_off0000e32e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE32E 17636 bytes
SHA-256: 75b8ee783b59ba2e5d747bebc980fce76b813a8d5934733e35af959c023f47ac
font_02_sfnt_off000110d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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