Malicious PDF — malware analysis report

Static analysis result for SHA-256 865e9df092551c5b…

MALICIOUS

PDF

129.3 KB Created: 2021-09-04 22:28:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 75e1b3d7df784bff9f6a6290842451c8 SHA-1: 3bc29073568ca9135fbb8eddbe96bb55df3d459b SHA-256: 865e9df092551c5bc6a89ea22429a95eff059d75bcdbf6c7917d931fa269a2a3
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. Heuristics indicate the PDF contains a link farm pointing to compromised WordPress upload directories, suggesting an attempt to distribute malicious content or phish users. The document body is unreadable, but the presence of numerous links to potentially compromised sites strongly supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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 http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adc68d68d41---9797738268.pdf
    • https://lanna-flyingclub.com/ckfinder/userfiles/files/wofakifekajozaxa.pdf
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160779c13459ec---42269883028.pdf
    • http://jinyezi.cn/upload/zesufilixinob.pdf
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/0604ca216584bc3c47de2638bbb4506b/zipakenirusox.pdf
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160724ca845529---76192304845.pdf
    • http://ikra-ekb.ru/files/fckeditor/file/30053373912.pdf
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cc4ab6ea86---tabadi.pdf
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160caed7aa773d---58702622865.pdf
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/d239bfa197e9daf7e16487caceb92b0d/46880176368.pdf
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160a0dc544c26f---66542633054.pdf
    • https://associazionedynamica.it/uploads/file/90559575911.pdf
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/9d47346b5bdd387e2ae586db271cdf30/24186755670.pdf
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1608631f27df98---31749552827.pdf
    • https://atcotourismtravel.com/userfiles/file/vasevewurebew.pdf
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/888edb0e24833ffc37d6dd0b7bf7b1e0/dinabugatat.pdf
    • https://bya-ingenieria.com/ckfinder/userfiles/files/bizazonawibo.pdf
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160775085c3ab6---82254636041.pdf
    • http://xn--k1akb4c.xn--p1ai/userfiles/file/89098500075.pdf
    • http://mexxeopaint.com/upload/files/jirisavepapogas.pdf
    • http://rungrawin-itt.com/userfiles/files/35185446989.pdf
    • http://sevinctekstil.com/resimler/files/pemusadadodegidufedopef.pdf
    • http://kwartetproforma.com/userfiles/file/lugugabobu.pdf
    • http://mitsubishilongbien.vn/images/ckeditor/files/sinumajogezofesu.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=gun+digest+2020+pdf
    • 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_off00019274.bin
478121f8fe626e4a25043aaa377534079a6309f8f9afa94f5e4fae7adcc67679
pdf-font-stream PDF embedded font (sfnt) at offset 0x19274 10624 bytes
font_01_sfnt_off0001aabd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1AABD 16792 bytes
font_02_sfnt_off0001c2cf.bin
e9359e151b1249c5c7ffc9256ec1c11fdbd14dec63744d78635b3b69c04a4a2d
pdf-font-stream PDF embedded font (sfnt) at offset 0x1C2CF 20316 bytes