Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ab130c4bf71d66b…

MALICIOUS

PDF

84.8 KB Created: 2021-09-04 06:46:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 65fe05cd5bc8732926f427dac02a60c7 SHA-1: f6491faa5af78fa41b2209edd2b63e8a237f9b90 SHA-256: 8ab130c4bf71d66bd98d4021db9d2a6183985fac9a58bf761370a2553f4019d3
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 0.9974

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://smidgel.ru/uplcv?utm_term=sadhu+singh+pdf+download PDF link annotation
    • http://ladakhtripmaker.com/userfiles/files/89454630559.pdfIn PDF document text
    • https://fullgame.hu/uploads/files/tujafadeboj.pdfIn PDF document text
    • http://plncse.hu/php_data/file/varaloj.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f718d7866a4---potironovamitonegegez.pdfIn PDF document text
    • http://ibrahimalsada.com/pics/file/41752717832.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607e45a7962b7---setajukuzozogakogexum.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/68e674f5352e71df525b3155998b046f/44605606672.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa7d661c270---ronakoropidajosil.pdfIn PDF document text
    • http://toyotalongbien.org/data/dulieu/files/pezup.pdfIn PDF document text
    • http://tele-fonika.pl/upload/file/97392210164.pdfIn PDF document text
    • http://www.europesolidaire.eu/userfiles/files/76018155720.pdfIn PDF document text
    • http://zekejozsef.eu/FCKfeltoltott/file/pisavafaxawurevaje.pdfIn PDF document text
    • http://grodgolf.com/clients/f/fd/fd83fa7079552abb47853a85229f74c1/File/rabadedimujape.pdfIn PDF document text
    • http://beastyenergy.com/userfiles/file/29088290312.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/47761519538.pdfIn PDF document text
    • http://mrhobbscoffee.com/images/uploads/file/30249439665.pdfIn PDF document text
    • https://airflow-skateboards.com/upload/file/29976966248.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160840509d9ffd---zibubotapelekodupodudo.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/e53644299d8dff9666453eaf98f8027d/55263814407.pdfIn PDF document text
    • http://tipiland.net/upload/file/fowezajabowosomi.pdfIn PDF document text
    • http://wahibluedevils76.com/clients/5/55/55d7338a7abcce318bc847d7f34994f5/File/pimukuzudazuvonurezoxo.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160841c9973ded---guguloxolusogusuvuvuz.pdfIn PDF document text
    • http://wuxihemei.com/ckfinder/userfiles/files/20210627_190726.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/16102156583.pdfIn PDF document text
    • http://villapellegrino.it/userfiles/files/11672025946.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_off0000e619.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE619 10708 bytes
SHA-256: c13abb58bd619bf9bd58bfddbe3e5d12d2a00cfccdb8b7923527b0e06dcf6123
font_01_sfnt_off0000fe61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE61 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011673.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11673 18004 bytes
SHA-256: 807548e1c93f88b586a7800944e1c88349a248d5d15ec5c1349df94174c28e00