Malicious PDF — malware analysis report

Static analysis result for SHA-256 eeb15cb4974a0568…

MALICIOUS

PDF

191.1 KB Created: 2021-06-27 16:48:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c029a890ba0c2b05f9c6116ed7252b1c SHA-1: 50357aeedc2c4ebe7b5b234a239c86a17a82687d SHA-256: eeb15cb4974a05682fad19e613dea7bad4359c940b9481b5699474b1494aef69
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm, with multiple URLs pointing to potentially compromised WordPress sites and disposable hosting, suggesting an attempt to redirect users to malicious content. The document body was unreadable, but the presence of numerous external links and the nature of the heuristic firings strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/ff88fec3797d0629099a39c0035e1ee6/10404965406.pdf
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ac3b581e049---fotedulezusiwi.pdf
    • https://skvely-kup.cz/files/file/86962723075.pdf
    • http://fullcolorspandoeken.nl/userfiles/file/fuzabara.pdf
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc2620c765---varoja.pdf
    • https://aprilboya.com/userfiles/file/mixadivikavemekaretujif.pdf
    • https://skyzoan.com/cake/beta/userfiles/file/buwabuwapegojemux.pdf
    • http://robwalker.net/fckupload/file/kuxaniroweto.pdf
    • https://www.helmmsp.ca/wp-content/plugins/super-forms/uploads/php/files/2c19235f62381b29b1129df5f15dc8ee/rozemi.pdf
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/lgpg5qt6d6k7p0t4a8ng65n9v1/20968968451.pdf
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/o962oh4ebs1nbqukeeeec1fhl7/65858636316.pdf
    • http://pressvaluation.net/userfiles/file/13691259905.pdf
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/d32d7905c057d37159d9551bba8e9df8/gosakiwebimanitofime.pdf
    • https://istanajp2.com/contents//files/tumixudusa.pdf
    • http://billsky.ee/files/file/54444086448.pdf
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160a57c0504321---napefatulizob.pdf
    • http://nguoigiupviec99.com/webroot/img/files/zuruluvofavet.pdf
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608523eb4b74a---tiwuboj.pdf
    • http://khaskhaan.mn/uploads/userfiles/files/pojezezorikarewusudav.pdf
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1607bca059b0f0---34170381187.pdf
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c64b7f4253f---24203185140.pdf
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afb5576cd10---lofidabozowimulowovuxu.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=flat+barbell+bench+press
    • 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_off00028e16.bin
1027dec76df27557d6f49961185573a0572fa4306df60a70c0bd86cdf9b91eb2
pdf-font-stream PDF embedded font (sfnt) at offset 0x28E16 18080 bytes
font_01_sfnt_off0002bd9b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x2BD9B 16792 bytes
font_02_sfnt_off0002d5b2.bin
7cd0979acfdc2a47ed6ef6edafb4672d4070d791dd1ed06d7763ebc74971d243
pdf-font-stream PDF embedded font (sfnt) at offset 0x2D5B2 10376 bytes