Malicious PDF — malware analysis report

Static analysis result for SHA-256 b57a71912975bc4e…

MALICIOUS

PDF

87.0 KB Created: 2021-06-25 20:44:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 949905e438a4af5b9c34b54a1cf005fd SHA-1: 3183c0d18a4e77a592d1b173558aff57374628f6 SHA-256: b57a71912975bc4edec1fde4cceb572a396bcacd1e24bd05b61ea8f2cc16f471
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body is heavily obfuscated and unreadable, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • 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.
  • 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.logomarcanet.com/userfiles/file/tuxojerakodasat.pdf
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160c6b5e5abf45---gilejitorifomomafipalumuj.pdf
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a61fdaa364e---wikimag.pdf
    • https://flardochform.se/userfiles/file/17172974261.pdf
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608b0e6ef0db0---bokefo.pdf
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097707cbb5e3---jolukerarexazuver.pdf
    • http://businessvaluationapp.com//fck_files/file/12028084576.pdf
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c4acbc80f8---gefogagizowar.pdf
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160cdbc392d46a---wuzutu.pdf
    • http://afghansolar.com/userfiles/file/tudugu.pdf
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/495409624dcc9f8bd0a2fb3435fb1a67/zedefajesisemeguwim.pdf
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/5cb81ced9a59fc517e5697c0b5dba5d0/zanowekubomerovefeditupu.pdf
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081db8213b5a---xafunofadabizo.pdf
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/bcmsbaahp0eeom2mnlq43p0311/penepobazobavup.pdf
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074cd9231f5a---funixifanabiwimaxig.pdf
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/6d8b0a3f314abbcfba364c87c1f1b9cd/figabuwisavuxonulatu.pdf
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e2988dd5d3---vitix.pdf
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/6mpns1tkqej54b3armkuovn3gs/wusemubijuzemefadulemuj.pdf
    • https://ferado.vn/userfiles/file/nudobexowapedewalore.pdf
    • https://dgaspcsm.ro/ckfinder/userfiles/files/67247560245.pdf
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087afaa16df9---suminusozuwobagefowesuka.pdf
    • http://xn--vb0b83rba554gca.kr/page_data/file/20210510055218.pdf
    • https://kitapkaplama.com/upload/ckfinder/files/73032604652.pdf
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a4a3bd9de33---30620848479.pdf
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/gfbdksqfq42l9jst197dq5v747/potidevuvelidigowijemo.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=laurie+cougar+town
    • 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_off0000f28b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF28B 16792 bytes
font_01_sfnt_off00010a9d.bin
be6780d489ebf577053cd88b1b8d5f005c615b0e2044400b194b55043f54c717		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A9D 17204 bytes
font_02_sfnt_off00013772.bin
7df51151a38041316f5b28c95c4ee034c53f609e70c53a22d7e990d1ec5c6d9f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13772 10336 bytes

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