Malicious PDF — malware analysis report

Static analysis result for SHA-256 937b32adb556fb90…

MALICIOUS

PDF

91.9 KB Created: 2021-06-28 04:47:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: beb9316e80bbd68014f82e1565277b3e SHA-1: 930b36abfacd6afb32874cd76cbfc095919c8f5d SHA-256: 937b32adb556fb90807a24386607e19209d6283c0e665cc019c8bcf02a1fd83a
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting an attempt to redirect users to malicious sites. The presence of external URIs and a high ML score indicate a strong likelihood of phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/d7ca3128602a1462711a1f173681e483/17726583817.pdf
    • http://instant-image.net/UserFiles/Site/File/tarexuteluxunofix.pdf
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/1nc63744e8nljm8lhpo3kiflq1/45219818592.pdf
    • http://learnersdigest.org/userfiles/file/21129083769.pdf
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/3f3583f12415691396625afe8324fc12/topotepibol.pdf
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/8789978569b0f45c7fb7bf728aa04212/95624611409.pdf
    • http://macautemple.com/userfiles/file/rafezuzu.pdf
    • https://accesoriosalmayor.com/images/userfiles/file/xovof.pdf
    • https://grup-insaat.com/userfiles/file/zunivepapufijajuwakub.pdf
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092b2c4ede10---1351966947.pdf
    • http://amexeuro.com/an3_Uploads/file/forimatonixuv.pdf
    • https://zlato-eu.sk/upload/files/76568759270.pdf
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4f721ec5f0---baxitomila.pdf
    • http://bocghedanang.com/media/ftp/file/97842168277.pdf
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/f0fe479831ce7a2f82754035f9505bfd/6106479603.pdf
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609e192980984---92061699380.pdf
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/ac0df7aba037a58a573ab0a8bd81fa29/galamosivifetoz.pdf
    • http://ohsclassof73.com/clients/9/9a/9a21b0b253f7c4eafe662346d237c286/File/pifejipesizevomutem.pdf
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/d454acfca00d2bd2fc7cf99194f1582a/zotos.pdf
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/cd0048d36544a548e18c8074e3c09c7c/19478324286.pdf
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/15a6ad94d08e4e6cc9de6cdf47c7a9f6/59974286297.pdf
    • http://lnaixi.com/userfiles/file/20210620173229_1935838671.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=chopin+pianist+and+teacher
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010593.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10593 16792 bytes
font_01_sfnt_off00011daa.bin
201b7bed19f7ddf2a9536f116e84af7c3b4ed2d40cdab99344a7692afeb36278
pdf-font-stream PDF embedded font (sfnt) at offset 0x11DAA 10596 bytes
font_02_sfnt_off000135d7.bin
7f329edc0cd81705e4ebddf6c282adb64e4e56e2ef75861ae8270ce2e30acc87
pdf-font-stream PDF embedded font (sfnt) at offset 0x135D7 17744 bytes