Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce32ac7a59d5eb46…

MALICIOUS

PDF

91.7 KB Created: 2021-09-06 02:21:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9f26a3b85e3fad94776d00f866ea45eb SHA-1: a2e4624c8bd013cd036dab40265498b584334510 SHA-256: ce32ac7a59d5eb46830b7ab2e61b0856e16a646df7f787554ffbfe060eb432a7
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous links, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall detection profile strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 https://thuanxuongmonmb.com/admin/webroot/upload/image/files/ferog.pdf In PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/6311809c1e907f37083e8fbd9a2627cb/rusig.pdfIn PDF document text
    • http://sskj.pl/userfiles/file/68062010945.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/17793e840837974e5b6bb98f4794d98d/tufijepilav.pdfIn PDF document text
    • https://quatcongnghieput.com/uploads/files/sididavipog.pdfIn PDF document text
    • http://doo-san.com/userfiles/file/20210529070448.pdfIn PDF document text
    • http://fairmonteast1969.com/clients/876766/File/lanekovobodewoguki.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/26bdd520c6ee21e6ccc89eb3f525072e/pajumasevotufijuli.pdfIn PDF document text
    • http://mientrungland.net/uploads/image/files/tibipatorumaveju.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/31f03f11c958d8671b01dd61f4a33ed9/waxumezedad.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/nebesemipul.pdfIn PDF document text
    • http://manpukulivermore.com/uploads/files/kapifekebubozivid.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b5d72bdf0a7---87992847558.pdfIn PDF document text
    • http://flooroverstock.com/admin/userfiles/file/didigugapota.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/eb2675ec8a872e9ba58cd144d7b12caf/zisepuxesisip.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16082aad752228---43560932887.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/tebikokadurufiturilip.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a81c208d0de---nepufukanegu.pdfIn PDF document text
    • http://xn--66-6kc8bfmkmjd.xn--p1ai/admin/ckfinder/userfiles/files/rowuvuwu.pdfIn PDF document text
    • http://dfwsedan.com/nbloom/fckuploads/file/duvibenimugujew.pdfIn PDF document text
    • https://ecotranslation.ca/upload/editor/file/bozisiduvegusegosozas.pdfIn PDF document text
    • http://self119.net/upload/userfiles/2021/07/files/210701211011.pdfIn PDF document text
    • http://alrehabourhome.com/userfiles/files/66277281339.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/161110d4313cff---lukalib.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=estimating+weight+worksheets+2nd+gradePDF 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_off0001040c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1040C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011c23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C23 10932 bytes
SHA-256: fde676e2f0d8061239f0e80d556d3a8da74df709c0e173376a876d95e67dc8ba
font_02_sfnt_off00013525.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13525 16928 bytes
SHA-256: 9568a9f92c377f26682f97cda290825b455fb42fccf213b7314ab15ace1b5b53