Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a31ed36485ce149…

MALICIOUS

PDF

76.4 KB Created: 2021-09-01 00:19:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 540c730083e1129b444d5c4216342b3a SHA-1: 120c511946e488429f8a35a8474fd2974b4398cf SHA-256: 8a31ed36485ce149f43f2e8bb4460ae114759eb44daf3dd86dc23374e7964b31
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, indicating a link farm designed to redirect users to potentially malicious content. ClamAV detection and ML classification strongly suggest malicious intent. The presence of multiple external URIs and a link farm heuristic points towards an attempt to lure users to external resources, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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 http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/1610523151eab9---58149327142.pdf In PDF document text
    • http://siripanyalamphun.com/user_img/files/90605295576.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608d7ded1057e---gokibafafal.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc6fac431ea---95852074206.pdfIn PDF document text
    • https://navoloki.mebel18.com/uploads/files/fukepogotojegi.pdfIn PDF document text
    • http://ergo-logo-bamberg.de/userfiles/file/73176618015.pdfIn PDF document text
    • http://modern-pro.ru/files/file/kodawederoxukasogepu.pdfIn PDF document text
    • http://billedbutikken.dk/articlefiles/file/zireworerajasobugef.pdfIn PDF document text
    • https://micsys.in/userfiles/file/bulakabonivoli.pdfIn PDF document text
    • http://studiogeologicotrilobite.com/userfiles/files/sebaf.pdfIn PDF document text
    • https://clickkedai.com/userfiles/file/11202101094.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160dfd8c3ce609---sewosotob.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/pieq9aa3rn63cfpm0gm9d7421b/92015386695.pdfIn PDF document text
    • http://mellorymotors.ru/admin/ckfinder/userfiles/files/28443445920.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16079275ba194b---32224241578.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075631abe853---76050493026.pdfIn PDF document text
    • http://ashioke.com/images/library/File/8492322165.pdfIn PDF document text
    • https://nepalimodelagency.com/userfiles/file/wogitaro.pdfIn PDF document text
    • https://dammesliepas.lv/ckfinder/userfiles/files/15474117156.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/3600a679a83eb724e5a5cbb66d75c9fa/5273293684.pdfIn PDF document text
    • http://gift-founder.com/archive/upload/files/dijekipiginemixafok.pdfIn PDF document text
    • https://stancijanegrin.com/UserFiles/files/puzunebarupizin.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/55amf6a225f3o394av8r5otmdt/tugizutan.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=android+app+lock+source+code+free+downloadPDF link annotation
    • 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_off0000c540.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC540 17864 bytes
SHA-256: 318e5cbeb0b8ed1bf1844608c0688b8b2fae45b5bac0cc59811c904c1ffe6e91
font_01_sfnt_off0000f316.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF316 10776 bytes
SHA-256: 55ebdedd0ca93827a76504c1024fc0e0c43e5c6def813125de7af4679e4026b0
font_02_sfnt_off00010c12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C12 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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