Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd24c24098dda71a…

MALICIOUS

PDF

165.0 KB Created: 2021-07-16 00:31:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 2385ce0532454050137c9d3cf328bad7 SHA-1: f8c51991a79f1b09a836f25bdd72a0f4f5894fb8 SHA-256: fd24c24098dda71a4fa3fd1174ba4d122d4d634c8a534633e37741ff57f67534
164 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classification and ClamAV detection. It contains a link farm pointing to numerous external URLs, some of which are hosted on compromised WordPress sites or disposable domains, and one URL is specifically identified as a potential phishing lure. The presence of a visual download button further suggests a deceptive workflow designed to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ketchas.ru/uplcv?utm_term=cpt+code+for+bilateral+orchiopexy PDF link annotation
    • http://aquatrustfina.com/userfiles/file/fofozomifisajabubumewa.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/gasimonin.pdfIn PDF document text
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/1608d77eb48257---1751406083.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160e39c5144562---30504402899.pdfIn PDF document text
    • https://advik.net/userfiles/file/lozolapos.pdfIn PDF document text
    • https://autotronics.vn/userfiles/file/21365033472.pdfIn PDF document text
    • http://aviatechinform.ru/sadm_files/notuga.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/tajobepaner.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f0574896d8---96782737938.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160c48009c297a---bigugeforikedosedezove.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160963b19c554d---11846167616.pdfIn PDF document text
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/ee32dd6a76cb258234c6cefb756a6d91/nivigukevikugamidi.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160873bb1d3902---luxeke.pdfIn PDF document text
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/mosb15jk6use11lv2nhf8q0l82/634181229.pdfIn PDF document text
    • https://cuisinescartier.ca/upload/editor/file/32344244529.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160706509a6e94---wabivojanefijenuruw.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/296f1d2b9c4ff9ba39fc21a9a919589d/gowusifisewinixojumob.pdfIn PDF document text
    • http://rchs1964.com/clients/5/58/580abc73d3aac4ea3a2bdd7c75327783/File/ruzewej.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099829453ef9---55656550349.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/p1edhh4tb6ap7pevi2sivsvvs2/49602497316.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/4a854e477fe35c8c649f6930bb2070d9/96454135427.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c75cc33d621---18566132814.pdfIn PDF document text
    • http://myphamhelios.vn/luutru/files/sakuliguwak.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_off000223ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x223EA 10832 bytes
SHA-256: c34ce52da18783fec6fcd435ec170d397d817353cddbd1d54a07dac06fd30eba
font_01_sfnt_off00023cd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23CD5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000254e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x254E7 18556 bytes
SHA-256: 5cbf92c4a709f20db0b83e51cea79f3a3796d3450f4a188f57d574f9887e76a6

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