Malicious PDF — malware analysis report

Static analysis result for SHA-256 c51c386ee51dbcff…

MALICIOUS

PDF

88.1 KB Created: 2021-06-30 16:26:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: b49cbc5230a38625baa7c5da4f023bba SHA-1: 641708734b5e86ed3cbf1c46b636aa9e6ecfd9a4 SHA-256: c51c386ee51dbcff0aa1245e7b73a34aeb35fef34bcf5dc3ef55cb9d0d5e3f44
164 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and exhibits characteristics of a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting. The presence of a 'download button' heuristic further suggests a lure to download a malicious payload. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://irlanc.ru/uplcv?utm_term=ias+mcq+questions+with+answers PDF link annotation
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072b38152b6a---tasugasodaxunoliz.pdfIn PDF document text
    • https://an-professional.ru/img/files/file/gibuzi.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd4220dcc9d---80639080525.pdfIn PDF document text
    • http://aucoindeshalles.com/menu/file/77531339519.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ae79476141f---xapexix.pdfIn PDF document text
    • http://wjcopy.com/upload/files/2385135487.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/52987936477.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/877f4362fd3ad78ab93f77da0a4c0db8/beberubopodanulujopato.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608bdd0f4123e---81664959900.pdfIn PDF document text
    • http://soft-pro.hr/upload/datoteke/kaxubivosesenorusominiro.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/7aff4f6859505abeaebce4f6263a353e/dezuvu.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/88394013305.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608246d800b58---sonalipepukuzepalutu.pdfIn PDF document text
    • http://hkt-optics.com/hkt/images/userfiles/file/wuvomerawapezavezi.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160bbff133caaa---8672930452.pdfIn PDF document text
    • https://menuiserie-sainte-anne.fr/userfiles/file/75103365867.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16088926699967---zijotagixaz.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/16076dbeb016d8---midegotewa.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/160986ff262998---81138535109.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bad0d1cbdfb---dimisimoxi.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/ponepedakedakulekonatazaf.pdfIn PDF document text
    • http://pincailight.com/zk/UploadFile/file/2021062101042273499.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a64c423f2aa---wuzigabu.pdfIn PDF document text
    • http://peak-experience-japan.com/jumaxipesirojugapewupixe.pdfIn PDF document text
    • https://gastriklandsbf.se/UserFiles/files/5527198600.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/e8knf2o74nitirhep287qqhips/48231771238.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_off0000f3ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3AB 17728 bytes
SHA-256: 1b8a6be50a8be49ac9d13af35c7a5538a3289536904f59f2e58912257090144e
font_01_sfnt_off00012264.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12264 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013a7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A7B 10732 bytes
SHA-256: b8240f4385195a1aee3c4aa647b2e18685246711c089880067cbfaa4f9e62a96