Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d9342126a03e4a9…

MALICIOUS

PDF

154.7 KB Created: 2021-08-11 21:03:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-23
MD5: 7466550cdf976013d2979d6a5a3df582 SHA-1: ca0146da87c144394f970a8b488c80cf30a4e464 SHA-256: 3d9342126a03e4a91de09fc6510716020e09984d1cc54e8f112922c8e67ab02c
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

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://irlanc.ru/uplcv?utm_term=goodman+and+gilman+14th+edition PDF link annotation
    • https://hw-power.com/uploads/ckfiles/files/60e4fc6cc86a4.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/160fdab686cf1b---fipodojosikopefubita.pdfIn PDF document text
    • http://abwrichmond.com/uploads/files/40768868997.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0ifkojq7a3dk0alilnbdmafu12/rodufinijakojuzez.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161087ee4d8525---pufod.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/palibesunewunejewurumo.pdfIn PDF document text
    • http://caf-ljubljana.si/docs/50107824085.pdfIn PDF document text
    • http://limeitec.com/upfiles/editor/files/komaf.pdfIn PDF document text
    • http://bhs1966maui.com/clients/64750/File/89255824578.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/e80ff99df826b925163399bf76518e01/28807945436.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072c0fb5f7a7---parofuwevawemuzogeb.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160ed9f3e42dc6---59126269008.pdfIn PDF document text
    • https://hpsoft.shop/upload/files/gamapubunapoferobabir.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/41bf0d0740df5dfd086d0107b25814b0/veferijegenofujox.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/16076906f448d4---baguronetapijamugepa.pdfIn PDF document text
    • http://gaskinfamilyreunion.com/clients/b/b7/b798c9f9e2af69c3a5b950a06e4ade8e/File/77707742472.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072321b1d6fa---14290657698.pdfIn PDF document text
    • http://ukrainski-rosyjski.pl/userfiles/file/xenuzawodag.pdfIn PDF document text
    • http://j-line.ca/fck_upload/file/49189772008.pdfIn PDF document text
    • http://carrollcountylawyers.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/78803061562.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/1610b3af302f6e---5144535060.pdfIn PDF document text
    • https://glaze-metalart.com/upload/files/14141664428.pdfIn PDF document text
    • https://jasz-pap.hu/UserFiles/file/daxatilomefedosipumonek.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b18aa94cb1---lonobowa.pdfIn PDF document text
    • http://studioambienteterritorio.it/userfiles/files/61995616917.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_off0001f911.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F911 19556 bytes
SHA-256: bed56fee0bf3017edf567c2f370eb501eb49d99579cb85efb016285505a0d4ed
font_01_sfnt_off00022cc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22CC1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000244d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x244D8 10596 bytes
SHA-256: 98ac349fb8e0ad889e12f67a77149a1ce765bf040d652f86457e3681b3ee3b46