Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a2184a18e3bbafc…

MALICIOUS

PDF

82.2 KB Created: 2021-09-23 17:25:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 911a473ee5ec6dbbd72fc33695e62242 SHA-1: 43d3b62a4f4b5640266ad7728a3ca487cae12a20 SHA-256: 9a2184a18e3bbafc0a469fa0758de7de05a1cb84994d5723d811df7f8ea132cc
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics, including ML classification and ClamAV, indicating malicious intent. The presence of numerous external URLs, many pointing to PDF files on compromised or disposable hosting, suggests a link farm designed for phishing or malware distribution. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to decrypt an archive, a common tactic to evade gateway scanning.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://crewmak.ru/uplcv?utm_term=wifi+brute+force+attack+apk PDF link annotation
    • https://rjpexport.com/files/91953908063.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16134addf37613---60364192571.pdfIn PDF document text
    • http://taxilitomerice.cz/ckfinder/userfiles/files/78173965297.pdfIn PDF document text
    • http://karpatskiles.ru/store/files/91339986076.pdfIn PDF document text
    • http://thuannam.com/image/files/vegokada.pdfIn PDF document text
    • http://indianspringhomes.net/userfiles/files/jasafaburobuzezuvaz.pdfIn PDF document text
    • https://mraos.com/web/userfiles/file/sapejov.pdfIn PDF document text
    • https://kuepancong.com/contents/files/25973794831.pdfIn PDF document text
    • http://arsvet.ru/img/upload/tipopotusom.pdfIn PDF document text
    • http://evo-models.com/uploads/userfiles/files/98474631071.pdfIn PDF document text
    • https://hotlinepro.in/admin/userfiles/file/pedirimeneriwulefunagabox.pdfIn PDF document text
    • https://jackinthegym.com/uploads/files/202109020331178557.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/c75aef342862661e8fcdd0a005ada21b/23378801885.pdfIn PDF document text
    • http://aranykoronakft.hu/userfiles/file/gevelenejusaga.pdfIn PDF document text
    • https://sharedsynergy.com/userfiles/file/rolewepavadepapife.pdfIn PDF document text
    • http://khonggianxua.samdigroup.vn/app/webroot/upload/files/bapezesobasaki.pdfIn PDF document text
    • https://fuoriscena.eu/file/9514023409.pdfIn PDF document text
    • http://cjmfgx.morefriendship.com/upload/files/1418114193.pdfIn PDF document text
    • http://lachambredechos.com/userfiles/file/mamugiwamotemug.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149778927d94---zogebixuwale.pdfIn PDF document text
    • https://matrainagycsalados.hu/userfiles/file/vovanakisumo.pdfIn PDF document text
    • https://kimcert.net/E/file/43500817232.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/db72f91761b13334ab1bfc3de07dbbf4/42261552926.pdfIn PDF document text
    • http://grubstreet.ca/ckfinder/userfiles/files/xomuvurijaborajuxunudole.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_off0000dd55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD55 10480 bytes
SHA-256: 3f231125b7bbf5e69ef99b7efeac16ed395edb551f829382f5e9891f233153d7
font_01_sfnt_off0000f51c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF51C 17824 bytes
SHA-256: 61ae4c979202ca650d1eb040d11ad57be07d62b5e734513bd5f108a9bd1eaf12
font_02_sfnt_off00012320.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12320 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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