Malicious PDF — malware analysis report

Static analysis result for SHA-256 b90112e831bb9e1b…

MALICIOUS

PDF

120.7 KB Created: 2021-08-15 00:54:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 29e52af068265d6e6ff742d74d38ec33 SHA-1: eadfee9531d349f8678bbc8ecebfcb96efcdc50d SHA-256: b90112e831bb9e1b012ecae2edcd0c52eb76aa67f0aa013d9dce5b6c6fb788f2
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a phishing or trojan threat. The document body is heavily obfuscated, but heuristics indicate it functions as a link farm and a callback phishing lure, prompting users to call a number for fake issues. The embedded URLs point to compromised WordPress sites, suggesting a method for hosting malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607f73ab5710e---wuposezisakusolajo.pdf In PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac9655d490---mawil.pdfIn PDF document text
    • https://santehsevast.ru/userfiles/files/rewenoteriwomafunesi.pdfIn PDF document text
    • http://www.dramayaramendes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16079fc6171f0e---vubelununa.pdfIn PDF document text
    • http://timelessmebel.ru/wp-content/plugins/super-forms/uploads/php/files/5f1d5c4980314fed34ce55066aa712aa/gekisaguwikilol.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/83ebvgatee621t24qn4hilo0d1/dusikozukev.pdfIn PDF document text
    • http://stylekd.ru/files/paxuzibegisijadaduzozi.pdfIn PDF document text
    • http://videofilm-tv.ru/content/File/gepuxejatanemejajizud.pdfIn PDF document text
    • https://ols.lighting/wp-content/plugins/super-forms/uploads/php/files/5e831793e988414b53bab7543b772e76/kuvopigejerotisomij.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a6fca9ccdad---rivikapid.pdfIn PDF document text
    • http://aquamedia.cn/ckfinder/userfiles/files/80886370022.pdfIn PDF document text
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/cf16e47eafe45a9f9a3e142fddf90b55/mabaruzubevugu.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a34b4416445---16042426118.pdfIn PDF document text
    • http://studiomarcheluzzo.it/userfiles/files/xejakok.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/1610660b82cf76---68901536971.pdfIn PDF document text
    • http://airsoft1.ro/files/file/fetorowupenaxorojari.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609606d92b7de---fafikejidisonimax.pdfIn PDF document text
    • https://appvid.eus/userfiles/files/47233072082.pdfIn PDF document text
    • https://rmp-familienanzeigen.de/cms/files/neveserelobipa.pdfIn PDF document text
    • http://wangyiphk.com/userfiles/58193419008.pdfIn PDF document text
    • http://mid-europe-ex.com/images/blog//file/dapewumezodamumebofeziz.pdfIn PDF document text
    • http://yogathoitrang.com/quangbasanpham/app/webroot/upload/image/files/25540987140.pdfIn PDF document text
    • https://deltagroup.bg/uploads/file/bakidaridugopev.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/743baecfe6d768643b1e082b12ed4038/dorafemalejasapekuduranof.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/ralixu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=12th+maths+pta+solution+book+pdf+free+download+english+mediumPDF 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_off000172c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x172C6 17112 bytes
SHA-256: 48f86154b6633c83894176f6825bc69600ded86206c4e3f037bafb6cd5aa4f75
font_01_sfnt_off00019f81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19F81 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001b798.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B798 11436 bytes
SHA-256: b155593e00aa27c3e08d65e212d7c8ea451d7e7c9fa86cb5013f2bae8b83fe8d

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