Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a0370f80b258db4…

MALICIOUS

PDF

79.9 KB Created: 2021-07-17 05:43:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: fd619a218d8a417327ac3d623c2c8937 SHA-1: 99e82cd976038fb01c5645084af179d3a151eb49 SHA-256: 5a0370f80b258db488bd22e22d6375485fbf894eb02011e7ec4613acff28e4e4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution intent. It functions as a link farm, containing numerous URLs that point to compromised WordPress sites hosting further PDF files. These embedded links are designed to lure users into downloading additional malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1606c97226344f---delorogenujikipuv.pdf In PDF document text
    • http://akwarella.pl/user_uploads/file/jusanepijin.pdfIn PDF document text
    • http://thrifty-uy.com/files/others/safugifilefe.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/f3dd256c604d8fb82e68d692b9704231/fipofelipazijopawaziti.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/2099988113cb291e1ca300249778fcd0/movowuvubatopulejanomure.pdfIn PDF document text
    • http://duocmyphamcongty.com/app/webroot/uploads/files/47641358977.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a6a331efd74---bosojesomodezurawe.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a73fe68c455---biradalepex.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6276ae4379---33862534350.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607d4c927d180---99625461425.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/c5pdofrc94blnojg9j2sldtof9/wakutufugevuvajakofividaw.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c4e8196b5de---geribirunepinolabera.pdfIn PDF document text
    • http://rsst77.ru/upload/files/vusubeselijexigovu.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607587edcddeb---24282790811.pdfIn PDF document text
    • http://iwishop.hu/file/zuwadavivaxuxuxex.pdfIn PDF document text
    • http://www.hussco-steel.com/husscofiles/files/23181353897.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/9ec6a43591b3f20b8f514cfeb9f69e45/4931857660.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16080e6c9c2c42---desuwumamudo.pdfIn PDF document text
    • http://jjinline.org/file_upload/file/15764382806.pdfIn PDF document text
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/76s09mgeh2stca850mu3vbcq35/vuzumufega.pdfIn PDF document text
    • http://zdrowejaja.com/Upload/file/58050635532.pdfIn PDF document text
    • http://artospace.com/pics/file/tirim.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c1db3f0395c---tonekemafogaliwo.pdfIn PDF document text
    • https://www.ideaklinikizmir.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073b028daa63---daloxetezuxogumetadul.pdfIn PDF document text
    • http://leadershipcareer.kr/fckeditor/_upload/file/47286822707.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=rest+of+peace+imagesPDF 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_off0000d5e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5E8 17016 bytes
SHA-256: 50ca0eacd4173cc772d04d34fc6f01da47c067ec9ab343f784700a140eebb7a8
font_01_sfnt_off000101f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101F6 10620 bytes
SHA-256: 7341348f2d13dfea93c655f04c27f2a4c7855a69d830ab97494a72c883e7b705
font_02_sfnt_off00011a58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A58 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1