Malicious PDF — malware analysis report

Static analysis result for SHA-256 27effda713fd0c56…

MALICIOUS

PDF

92.8 KB Created: 2021-07-15 12:19:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 304308120c3c5650f68cd9ae9209c644 SHA-1: a9ee449162ce6200ef67e4a82bc65291bb1d0055 SHA-256: 27effda713fd0c56fd5852f8e9d552182de043894dbb2141d6b1e0ebc00b4c34
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm with numerous URLs pointing to compromised WordPress upload directories and disposable hosting domains, indicating an attempt to redirect users to malicious or phishing content. The presence of multiple external URIs and link farm heuristics strongly suggests a phishing or malware distribution vector.

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://pphjako.pl/userfiles/file/ginijirasukulajuzu.pdf In PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/85393d38561be3ec4bf7f2c04fb8e6db/ruboxepubadoguv.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/7e3aab9955ee93e1c277ab312de801bd/xufigoroxul.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/9v2uamdb279i4kl85lh5isj0a4/36003268866.pdfIn PDF document text
    • https://ooo-kenk.ru/userfiles/file/xaxizemafebiwokidup.pdfIn PDF document text
    • https://caravanandre.it/wp-content/plugins/super-forms/uploads/php/files/ac6130f2bd4f0a0f5de634d68c34a1ff/bejoleravesi.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/f2cd9482e353a86c2654ff0d8d253969/waduluwobexopudumoni.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/jadefenamuzesatofib.pdfIn PDF document text
    • http://rw-hse-businessconsulting.de/userfiles/file/76358915065.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/0fdaabd1d041078581af1b8ad743bcc8/jidoni.pdfIn PDF document text
    • http://jyotiacademicpress.org/uploads/file/93159646263.pdfIn PDF document text
    • https://wonkingchina.com/d/files/63805078802.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1608feab1103bd---robipela.pdfIn PDF document text
    • http://donaldnathanlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/warukizekipubed.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/160abd0f8d3c26---78223553226.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/i706v3coeh4liqsvohvt97a5gc/mawogifezak.pdfIn PDF document text
    • http://planbmedia.hu/files/lalunawu.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/3qq367eogd8e6ohigib57pmj7u/33257721307.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/je85f3t3ja67972p9u4gm8c8v7/kigolab.pdfIn PDF document text
    • https://elbag.net/wp-content/plugins/super-forms/uploads/php/files/6d6d955957c3d47d3389cbc1b8fb3a92/nebigonoxemuvez.pdfIn PDF document text
    • https://nguoixunghekiev.vn/userfiles/file/xonaxilinavejopagevige.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160bf9b67cf74b---xizokixazuda.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=vroom+yetton+contingency+modelPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/04ab5f7f67208b52b8ce10e7f2a6967c/dopasunokukudivu.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_off00010acc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ACC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000122de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122DE 16796 bytes
SHA-256: 1bfd5e13d1a638f2ae35d5518d0641cbd3033a3e2a652f71a2b2edeb47c56655
font_02_sfnt_off00014e79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E79 10464 bytes
SHA-256: f612283075160a612ad223c329d1f322772125fff21a1c07a8c2b4b9f3a27666

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