Malicious PDF — malware analysis report

Static analysis result for SHA-256 461314e54548fe0c…

MALICIOUS

PDF

72.3 KB Created: 2021-09-11 08:17:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 440c889b7e06b0a5ef5ad55d91a5245c SHA-1: 2daaa295b201ac12ffce323b70473fa2ec7a793a SHA-256: 461314e54548fe0c844a6fc5d217f3410d5c8a8962a665596cf91810fee84e6b
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a malicious document, potentially leveraging embedded JavaScript for malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

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
  • 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.
  • 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://pistant.ru/uplcv?utm_term=best+android+games+of+all+time+free+download PDF link annotation
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/4717579626138b1375ffdb.pdfIn PDF document text
    • http://jinwoosmc.com/userfiles/file/gademod.pdfIn PDF document text
    • https://unitedpetexpress.unitedreloth.com/ckfinder/userfiles/files/89891882798.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131914b3c0bb---7688445070.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1613ba2057b4de---85963646385.pdfIn PDF document text
    • http://apsara.ru/userfiles/file/82049397527.pdfIn PDF document text
    • http://pcwenhua.com/uploadimg/file/1630783394851875074.pdfIn PDF document text
    • http://getampedmag.com/ckfinder/userfiles/files/53971924704.pdfIn PDF document text
    • https://lamaisonducoeur.ca/upload/editor/file/97426886982.pdfIn PDF document text
    • http://ahrestygz.com/userfiles/files/20210902_131523.pdfIn PDF document text
    • http://ih-consultant.com/ckfinder/userfiles/files/93057446240.pdfIn PDF document text
    • http://aardbeienfeesten.nl/uploadimages/files/vepoxuzeredirojakinu.pdfIn PDF document text
    • http://yizhu580.com/ckfinder/userfiles/files/xofajug.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/16134dd09a4faa---vopoxeludanikapanipazoli.pdfIn PDF document text
    • http://charmingcurls.se/upload/file/runowopunugevudakodabibal.pdfIn PDF document text
    • http://marketingnews.fr/images/file/kabazat.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/161363f09da6c5---guxaxowazojelewewo.pdfIn macro / runtime command snippet
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/pt7i4gdn49j93g230lh1f37n8l/80817543627.pdfIn PDF document text
    • http://1000projects.ru/upload_picture/file/tewofomatibopa.pdfIn PDF document text
    • http://www.primariasantana.ro/uploads/file/57268870012.pdfIn PDF document text
    • https://sadhankendra.org/erc/media/gepusiveviwogo.pdfIn PDF document text
    • http://goozzl.com/userfiles/files/99113067945.pdfIn PDF document text
    • http://mywymc.com/userfiles/file/zuzesuwubexufapudupojawe.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b34e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB34E 15008 bytes
SHA-256: 36718b2616d56f13d0f863503bed9a7b46acfe1f4278d8f3c6940dbed1d5fda6
font_01_sfnt_off0000d954.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD954 10836 bytes
SHA-256: c1c9826440d302e053591924958b0645dcdf939c0f632d9621bd799834403814
font_02_sfnt_off0000f231.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF231 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00010a3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A3E 1948 bytes
SHA-256: b033f7fcbcd390b2cb396fbb5f03ef01f7ca9afc151f9d9df21604321f961cfa

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