Malicious PDF — malware analysis report

Static analysis result for SHA-256 9976e4d95e61f450…

MALICIOUS

PDF

90.8 KB Created: 2021-09-20 12:48:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5afcf7cebf9c394f3c9e6ab42a61758d SHA-1: cf659da9312a5da7fc62037e4e9a8b6ce0e5c92f SHA-256: 9976e4d95e61f4500365fcd3b5b8fcd4907722a139cbe4021fb0dc3994f94964
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external resources, many of which are hosted on compromised CMS upload storage or disposable hosting, suggesting a link farm designed to distribute malicious content. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to decrypt an archive, a common tactic to evade static analysis. ClamAV detection and ML classification further confirm its malicious nature, pointing towards a phishing or trojan distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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
  • 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://smidgel.ru/uplcv?utm_term=pattern+lock+on+android PDF link annotation
    • http://evo-models.com/uploads/userfiles/files/deravasu.pdfIn PDF document text
    • http://savages.lu/imagesRTE/files/18936988969.pdfIn PDF document text
    • https://rosedreamholidayhomes.com/ckfinder/userfiles/files/loposib.pdfIn PDF document text
    • http://rtm-plus.com/ckfinder/userfiles/files/kodomesejebifeloxe.pdfIn PDF document text
    • http://unityproductions.com/upload/files/94210848145.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/1bde4f595469c4677911064f91c52501/27853767627.pdfIn PDF document text
    • http://illinoislivestock.org/userfiles/file/wisopatagonopodawugejinon.pdfIn PDF document text
    • http://zhizhencn.com/filespath/files/20210913010155.pdfIn PDF document text
    • http://studioriboldi.eu/userfiles/files/vurerivurijowodebuve.pdfIn PDF document text
    • https://pastijptoto.com/contents/files/fakolofizibatopove.pdfIn PDF document text
    • https://kaptenhoki.net/contents/files/1577202012.pdfIn PDF document text
    • http://mediacast.vn/ckeditor/upload/files/92281930489.pdfIn PDF document text
    • https://expomediainc.com/upload/file/jujelulivumor.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136bb6168cac---zokoladikozi.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/6623abd5ab4ba3e920a58a29e18dbadf/kufawutu.pdfIn PDF document text
    • https://swagath.co/new/ckfinder/userfiles/files/56692968258.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/638dc4f6d02edad0dee403ffa3743f69/14226656283.pdfIn PDF document text
    • https://ingatlansos.hu/images/userfiles/file/juguj.pdfIn PDF document text
    • http://ccspatti.org/userfiles/file/niverejelimixosufej.pdfIn PDF document text
    • https://khyatiinfotech.biz/ckfinder/userfiles/files/33756905807.pdfIn PDF document text
    • http://www.parinet.fi/tiedostot/files/69470646718.pdfIn PDF document text
    • https://sanghvicranes.com/staging/media/vezebirez.pdfIn PDF document text
    • https://araprinter.com/ckfinder/userfiles/files/kakekepegojomedabunugo.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614773797d7d5---53121178378.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/161328d455c8ed---38840993197.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_off0000fb6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB6A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001137c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1137C 19320 bytes
SHA-256: b2a370917a441b70e8d7fdd452a5a1c539b80907ea3b30767daed94819be9fcb
font_02_sfnt_off0001463a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1463A 10288 bytes
SHA-256: 3ab4dadd91d8ef36717e15863b15e296668f978f28d79c1a79b66d90c92dc17d

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