Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3e3e5b6f7b24fce…

MALICIOUS

PDF

81.9 KB Created: 2021-09-19 02:52:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9c6f653b81bfa1d21d5a33b9abfd7570 SHA-1: debac43719f156b92b52cff100c308ae77546869 SHA-256: b3e3e5b6f7b24fcebe8df597811eed55fe256e2ced0b0dd0523a971e2803cbd6
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external sites, many of which appear to be compromised WordPress uploads or disposable hosting, suggesting a phishing or malware distribution lure. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to decrypt an archive, a common tactic to bypass security filters. ClamAV detection and ML classification further support its malicious nature, likely as a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://laborke.ru/uplcv?utm_term=zar+archiver+apk+download PDF link annotation
    • http://185.33.116.145/~acus01/upload/files/kupijubuxedinazofadekaru.pdfPDF link annotation
    • https://italvaping.com/file/tivubogejura.pdfIn PDF document text
    • http://andersonlawdecorah.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/67794488252.pdfIn PDF document text
    • http://moriefrusca.com/userfiles/files/50437569506.pdfIn PDF document text
    • http://katela.net/userData/board/file/81050287023.pdfIn PDF document text
    • http://rayanchem.com/d/files/lopepuwemu.pdfIn PDF document text
    • http://kimwendelldesign.com/ckfinder/userfiles/files/18254320574.pdfIn PDF document text
    • http://dlastudenta.org/Upload/file/86943717798.pdfIn PDF document text
    • http://fcvperu.org/data/fcvperu/userfiles/file/bopinilaxukesolove.pdfIn PDF document text
    • https://femagnet.com/upload/edu/article/file/gemorexedetavosamege.pdfIn PDF document text
    • http://kuryakyn.ru/userfiles/file/12095019871.pdfIn PDF document text
    • http://otestmanager.com/club/data/userfiles/file/20210919020353.pdfIn PDF document text
    • https://creativitagh.com/pevron/www/img/file/3050098759.pdfIn PDF document text
    • https://rcot.org/userfiles/file/12309064839.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/161332c06de8b9---gevajurezawetare.pdfIn PDF document text
    • http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/jaromukufidegatunuz.pdfIn PDF document text
    • http://ridendo.cz/files/file/vuxepugovu.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/33494677316.pdfIn PDF document text
    • http://cbcom.fr/ressource/site-image/files/97431001851.pdfIn PDF document text
    • http://ymjgolf.com/file_media/file_image/file/32335049202.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1612f717e09465---94291572489.pdfIn PDF document text
    • https://datenglagi.com/contents/files/kedoxutoluruvexewaderemu.pdfIn PDF document text
    • https://automatisme-portail-bordazzi.fr/userfiles/fichiers/99391231635.pdfIn PDF document text
    • http://air-ned.com/uploads/files/vusuvamezamemupi.pdfIn PDF document text
    • http://vistobrasil.net/uploads/file/61416240181.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/ef9ba8e9e442e6a24e482df269b21a84/92878558226.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_off0000dca4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCA4 10552 bytes
SHA-256: caaff08af514967b86974f267dd75a6be0bd1759d52c85757569d32b1cb0ff49
font_01_sfnt_off0000f4ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010cbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CBD 17368 bytes
SHA-256: 261e66de0ea02051ea1e5a7708afa862a211f584404e02c3fb9e36818bd00f6c

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