Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae2ce1275f25306b…

MALICIOUS

PDF

81.0 KB Created: 2021-09-09 13:47:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d4f62cd163c02bff87069a53afe51562 SHA-1: c8add8358f72d38a7c1fc10858ba120af8917ea8 SHA-256: ae2ce1275f25306bb8ca9c159f638696116f2c35a8d38be3c9d38041b1c6a242
236 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous URLs that form a link farm, directing users to potentially compromised websites or disposable hosting. The document also contains instructions to disable security software, indicating a malicious intent to bypass defenses and likely lead the user to download further malware or submit sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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.
  • 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://philabc.ru/uplcv?utm_term=assassin%27s+creed+4+black+flag+download+for+android PDF link annotation
    • http://dieukhactransam.com/uploads/files/29815331956.pdfIn PDF document text
    • http://tatagz.com/uploadfile/files/lerepegasobureganirawip.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16137f3916ab15---60394367701.pdfIn PDF document text
    • https://medosojewellery.com/userfiles/files/3881047851.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139aa1f3c27f---pazosolaza.pdfIn PDF document text
    • http://thevisionkharj.com/userfiles/files/80968031220.pdfIn PDF document text
    • http://charmingcurls.se/upload/file/88438156782.pdfIn PDF document text
    • https://solucionaesp.com/ckfinder/userfiles/files/jovejejubaji.pdfIn PDF document text
    • https://pezenasenchantee.fr/userfiles/file/dudov.pdfIn macro / runtime command snippet
    • http://oprandi.it/userfiles/files/xesebosu.pdfIn macro / runtime command snippet
    • http://autoneza.cz/UserFiles/File/62504406451.pdfIn PDF document text
    • http://sanraimundo.cl/dyn/uploads/file/berexozupedenojivifax.pdfIn PDF document text
    • http://rioairporttransfer.com/ckfinder/userfiles/files/7697334348.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/16134f98f8b95d---visisowigigaz.pdfIn PDF document text
    • http://samuiluxurytravel.com/Uploads/file/59171721599.pdfIn PDF document text
    • https://rajatotogroup3.com/contents/files/56229199634.pdfIn PDF document text
    • http://unitez.net/images/newtech/files/92630849071.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613604ec50b16---87379161328.pdfIn PDF document text
    • http://bygreenpure.com/userfiles/file/sexukalusabevonelus.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/5bc8be076532d88f280f27ca3616f611/24229475775.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/161389ef104c4d---wosotejofuduti.pdfIn PDF document text
    • http://jtravel.clickis.kr/FileData/ckfinder/files/20210909_27678BD6FD3F26EB.pdfIn PDF document text
    • https://solucionaesp.coIn macro / runtime command snippet
    • 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_off0000d548.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD548 18048 bytes
SHA-256: 98800e9b1bb6fa711b31d805255a47d54f68d41592c6d591971019bd2a834386
font_01_sfnt_off00010451.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10451 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C68 10964 bytes
SHA-256: de240d78da0e21d6dda88bb87f1d9c61274a93c890ade848e3b71f0d60a6fdbc

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