Malicious PDF — malware analysis report

Static analysis result for SHA-256 b062a4cdac7b8d17…

MALICIOUS

PDF

86.4 KB Created: 2021-09-04 07:45:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: bcf056fc9adc743738fc5049d249946f SHA-1: a632ad7e997b49fa2cde8d209573490757e38225 SHA-256: b062a4cdac7b8d17e78d4e56125ff77d70aed92d727f9038a1cb4ee772e88ccd
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with numerous URLs pointing to compromised WordPress sites and other domains, suggesting a phishing or malware distribution lure. The PDF structure and embedded links are consistent with attempts to trick users into visiting external, potentially harmful, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://pablohernandes.com/wp-content/plugins/super-forms/uploads/php/files/204307c1541934bcc3c1f98020117bca/vubasotamogej.pdf In PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608e99db5b7de---32085101973.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606e765b9078f---19479878519.pdfIn PDF document text
    • http://naturallabs.fr/userfiles/file/13701755476.pdfIn PDF document text
    • http://prospekt-rostov.ru/ckfinder/userfiles/files/41239014543.pdfIn PDF document text
    • http://autoscuolapezzano.it/userfiles/files/dubivu.pdfIn PDF document text
    • http://nktrading.qa/file/files/xavijurakobo.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16117a4727d78e---zutubus.pdfIn PDF document text
    • http://danieldesignpro.com/userfiles/fubujetomigiloxagod.pdfIn PDF document text
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/bea4a93f2810e4026ff5bbcf2d83ea70/782759489.pdfIn PDF document text
    • http://autodilykanka.cz/cmsimple/images/file/67100940787.pdfIn PDF document text
    • https://haidangpc.com/contents/files/rinonapaxab.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a41e717d8ff---kobubimejugukomojugo.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/vakul.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/69957773944.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/ts2c251nmnltdlrpusms6855q2/76819632207.pdfIn PDF document text
    • http://antasboru.com/guvennet/resimlerfiles/nokozikulowunotune.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/882ee7ccb23e994c08e1cad3d16ae6fe/gadavanavobonopobusabobet.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160770eb86e399---xomuruliwolu.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b4cf707b297---dadutexuvegitub.pdfIn PDF document text
    • https://jbdclothiers.net/emailer/userfiles/file/fokitamosakeb.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16072f48369bdb---18632666230.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/77f7a3e467d9a0d99cad952b125641ba/7156171550.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/4dcba224fc61db8a6ca91e59acdeb58e/14628801023.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160899da507ca3---lamejibosenavawawukul.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=surface+area+of+cube+worksheetPDF 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_off0000e736.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE736 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF4D 10684 bytes
SHA-256: 8650ece4a8dc38a3f180ca281a4b84daea2dd32e2cc4d742894fbc1c73d274bb
font_02_sfnt_off0001180e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1180E 20184 bytes
SHA-256: 8052f2f3a8bf3b7a8df6db200167d1c6741c5bbab92d9ecc4e3f446e4a2afaf6