Malicious PDF — malware analysis report

Static analysis result for SHA-256 213a88073c559b6c…

MALICIOUS

PDF

92.6 KB Created: 2021-07-02 15:26:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 45754b9d55482af52b0013d79750ff14 SHA-1: 79effe2b20a48a71e515918eb87ef75ed8446db4 SHA-256: 213a88073c559b6c792e05201becf4a155283cd3053a76a0b024175fc3da8032
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, a common technique for executing malicious code within PDFs. It also features a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites or disposable hosting, suggesting an attempt to obscure the final destination or distribute payloads. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://katheran.com/clients/55933/File/51953584187.pdf In PDF document text
    • http://ottotech.center/userfiles/file/58379538251.pdfIn PDF document text
    • https://grup-insaat.com/userfiles/file/69501342889.pdfIn PDF document text
    • https://anmimar.com/royal/userfiles/file/wasixif.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/73414872a43df9a847dea1c18625a9c1/sufigogesazefitara.pdfIn PDF document text
    • http://tafgambiatours.com/userfiles/file/kujevatezetew.pdfIn PDF document text
    • https://kop-trans.pl/uploads/userfiles/files/wipemilekoginuv.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/0c3085c411efccbdb29f45322cb2a9c3/sojabuwojali.pdfIn PDF document text
    • https://pmfegypt.com/userfiles/files/15953080124.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/jhlqnga0cnjph8ftll9f7onmnd/23660132314.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf9a69716de---54185051268.pdfIn PDF document text
    • https://comiconfezioni.it/file/22310826672.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609aa77b2958c---rilozu.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/ndi2k6a97uj3td1ajup6blb0dc/pesisirapuzigujeg.pdfIn PDF document text
    • http://globeksa.com/ckfinder/userfiles/files/37047932895.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/56804299615.pdfIn PDF document text
    • http://ehhs1969.com/clients/6/67/67a0fa02f482ea8575b7cec7429e43a8/File/26740315023.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/85850531966.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cba752b038c---76318920479.pdfIn PDF document text
    • http://www.leads-bd.org/app/webroot/js/ckfinder/userfiles/files/xurezeredebenifuta.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd8a324f4a---zabipivijibakeresaxuzote.pdfIn PDF document text
    • https://visionbrindes.com/admin/fckeditor/userfiles/file/vexekoru.pdfIn PDF document text
    • http://bookblog.kr/data/file//files/jebiwijila.pdfIn PDF document text
    • https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/s7e5slcvdg0c8hdnikocq305o5/pefijufijijowokaxonukunu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=how+many+years+it+takes+to+get+a+bachelor%27s+degreePDF 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_off000103ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103AB 17220 bytes
SHA-256: 4f232597cd03ef8a953679c3a2e9a9ccc6b2e8d7164e1d8930117f86d3c6b8d3
font_01_sfnt_off0001308a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1308A 11276 bytes
SHA-256: 6a9ed29f2d15e00f87906b3623d25475018211df234e74a542ae84701ff27d4f
font_02_sfnt_off00014ab1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14AB1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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