Malicious PDF — malware analysis report

Static analysis result for SHA-256 961de813861c21b2…

MALICIOUS

PDF

90.6 KB Created: 2021-09-20 03:06:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4dadcdffff8fd523709e7915240fcfc4 SHA-1: 85cffee82cbd9d52746f41780bbab5a6c79afbd6 SHA-256: 961de813861c21b283ebea940c15770d0ac05b5ce663e38a95a16c3e00ab676a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm, with numerous URLs pointing to potentially compromised WordPress sites and disposable hosting. The embedded URLs, such as 'https://smidgel.ru/uplcv?utm_term=jak+ogl%C4%85da%C4%87+filmy+na+androidzie', suggest a lure for users to click through to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://smidgel.ru/uplcv?utm_term=jak+ogl%C4%85da%C4%87+filmy+na+androidzie PDF link annotation
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/161408d13c4158---36492619790.pdfIn PDF document text
    • http://linker-apps.com/files/36020429839.pdfIn PDF document text
    • http://haisushitogo.com/uploads/files/mijegafumijupa.pdfIn PDF document text
    • http://industra.sk/userfiles/file/93215578594.pdfIn PDF document text
    • http://goodlack.cz/userfiles/file/53574112062.pdfIn PDF document text
    • https://www.la-melodie-des-saveurs.fr/ckfinder/userfiles/files/weletupawanoxuxadedem.pdfIn PDF document text
    • http://cungcapbaoduongcuanhatban.com/upload/files/49070058183.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/63257255657.pdfIn PDF document text
    • https://idd.no/ckfinder/userfiles/files/22175070431.pdfIn PDF document text
    • http://vandofigueiredo.com/userfiles/file///pokuwulopu.pdfIn PDF document text
    • http://hzzxtl.com/UploadFile/file/20210914011314797.pdfIn PDF document text
    • http://www.vinoplaza.nl/img/upload/files/menexanewararexodo.pdfIn PDF document text
    • http://spodne-pradlo-2bpoint.sk/UserFiles/File/39980342590.pdfIn PDF document text
    • http://gardena.crazyrockinsushi.com/uploads/files/wilet.pdfIn PDF document text
    • https://cfi-registration.amyhalter.com/buzzboxgift/img/userfiles/files/20117955023.pdfIn PDF document text
    • http://wakesup.org/userfiles/file/juloxapubizowase.pdfIn PDF document text
    • http://dsagco.com/Upload/file/42002767149.pdfIn PDF document text
    • http://odumakus.com/uploads/files/sunamudewala.pdfIn PDF document text
    • http://equipociclistaugeraga.com/ciclistas/userfiles/file/tefipotosobo.pdfIn PDF document text
    • http://savitapiti.org/ckfinder/userfiles/files/xukatumagunugaf.pdfIn PDF document text
    • https://all-stage-meditation.tw/uploads/files/6133b1d5657f0.pdfIn PDF document text
    • http://kemmurad.com/webroot/img/files/32985955330.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/mp7lcpvkkfrsj7q8p7j0ol2rju/dugefurerema.pdfIn PDF document text
    • http://mackielaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/5446186658.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16147b07b8a367---zunutotiluxaxedapefegi.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_off0000f9b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9B7 18500 bytes
SHA-256: c4c4c9d940f6e89524c2c946aff60a4d422f237d252ef6fce05e9eae2aa376eb
font_01_sfnt_off000128e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128E6 11060 bytes
SHA-256: 9ee5dfdfc6146abf5d4e14b23b4486f5909b023479dd19e8d811061cf900f6ef
font_02_sfnt_off00014221.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14221 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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