Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a3d5daeeb2c3874…

MALICIOUS

PDF

93.4 KB Created: 2021-08-30 04:05:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 8f45213704960120e3feffb715a99040 SHA-1: a7d10ed9a3020d1bf2ca0d799de7fafc4c19a317 SHA-256: 1a3d5daeeb2c3874c7090be3d8944dcc94136820ac372691dd838ebe5534ea65
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a link farm or phishing lure. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9876

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://oniceh.ru/uplcv?utm_term=brain+and+its+parts+diagram PDF link annotation
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607302bb48889---zofalebelobesin.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/ag6l2mo3k6vpbfsvilus4qhpij/jowudefo.pdfIn PDF document text
    • https://aronabritcan.com/userfiles/file/41315207309.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160876fa23df86---82795458464.pdfIn PDF document text
    • https://www.westcountrystoves.co.uk/wp-content/plugins/super-forms/uploads/php/files/e231af26ebf7ce3a15bcdc2202c56180/susogutagebusawamezep.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc5c19c99d---53053503567.pdfIn PDF document text
    • http://ninda.vn/userfiles/files/tejotinegijumurakukam.pdfIn PDF document text
    • https://www.scmsgroup.org/ckfinder/userfiles/files/zipipame.pdfIn PDF document text
    • https://marblobaths.com/app/webroot/img/files/6663857647.pdfIn PDF document text
    • https://xn--90aweabvm.xn--p1ai/ckfinder/userfiles/files/mujutupun.pdfIn PDF document text
    • https://triosms.com/userfiles/file/25954692504.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-6-13/20210613165749737664.pdfIn PDF document text
    • https://dailyhondaotomientay.com/upload/files/tofowugigiti.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/278cf103c0fdbb641d5c09b83161ed60/38846644205.pdfIn PDF document text
    • http://oroblupiscine.it/userfiles/files/45559194224.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/b5754905231ecfa6c22a05115dc63482/26782415388.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/c4a8f1cb7ee27219adb1a26b00147bc6/naguxewegujarezulo.pdfIn PDF document text
    • http://ndt-tl.ru/upload/file/nifimuridelavuxetewa.pdfIn PDF document text
    • http://emusicmarket.com/upfile/board/files/puwiwafumoxapefajibira.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/h1kusqbkj0f9fnc037ho6hmri2/jowon.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160e68643a0fcd---siverusaketuduxunit.pdfIn PDF document text
    • http://studioego.cz/userfiles/file/60353179587.pdfIn PDF document text
    • http://circolonauticofavignana.it/userfiles/files/17423969871.pdfIn PDF document text
    • http://stjconsulting.it/userfiles/files/95852636605.pdfIn PDF document text
    • http://stuarteisbrucklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fufutotonekuguxotir.pdfIn PDF document text
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/b7604343727ff8abe53c14b4d6556abe/rizedid.pdfIn PDF document text
    • 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_off000104c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011cd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CD9 10488 bytes
SHA-256: 73c49ec2ee89d0febd6809f01dc1d4e108b4beb2ccf11570f7d4a6f75e7befe8
font_02_sfnt_off0001346b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1346B 19144 bytes
SHA-256: e8c1216878b3b65b7631e16cc2542664e163180d9d709e9734c173ab66a2e24e

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