Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad4e785bc29125af…

MALICIOUS

PDF

72.5 KB Created: 2021-09-13 17:45:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6838c1ea9a573c8fab81d57f110c5521 SHA-1: 2be9e9c0e68ada55b18180d0cb2027181d87da1a SHA-256: ad4e785bc29125af008d1977989efd64bd2f7a142db08b12b5ff0c22bf440453
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised WordPress sites, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://pixomot.ru/uplcv?utm_term=alfred+piano+level+1b+pdf
    • https://momentous-inst.com/uploads/image/files/popivo.pdf
    • http://xn--hazrdner-r4a10d.com/alisveris/yollanan_resimler/file/67341204402.pdf
    • http://gshosnab.ru/userfiles/file/vawasusipiliwulosubejet.pdf
    • https://derya.afmiletisimajansi.info/resimler/files/tanataxuxonomaw.pdf
    • http://hytechcommunications.com/userfiles/file/tamipotubodarojamafemuge.pdf
    • https://ganganagardentist.com/userfiles/file/lovazixapipebobaxitopen.pdf
    • http://trivio.it/userfiles/files/66256684588.pdf
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613e871d85d6a---65031883541.pdf
    • http://rld-carbon.ru/file/77070576360.pdf
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/2867985870.pdf
    • https://myvideoclasses.com/ci/userfiles/files/xesajuxezabetelusugivex.pdf
    • http://mea-travel.pl/userfiles/file/kedapewaranimofi.pdf
    • https://thietkewebseo.com/webroot/img/files/fuwikefakukapegepurak.pdf
    • http://kanchanaspa.com/ckfinder/userfiles/files/ligababawebirij.pdf
    • http://www.taimaobi.com/admin/ckfinder/userfiles/files/46506851360.pdf
    • https://groupunsur2.com/contents/files/87625562434.pdf
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/56bdrb2so0mjtjbl6sq7s09j6i/nejijutotunof.pdf
    • http://vibrobeton.by/pics/files/vakidijabejupabuleluwe.pdf
    • https://luatsuavina.com/userfiles/file/82518952117.pdf
    • https://cissud.it/uploads/ck_editor/files/83025047574.pdf
    • http://diencongnghiepvohoang.com/uploads/files/zeketokefuxewiletisa.pdf
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161314068a7c38---nojejasuxononekegoxul.pdf
    • 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_off0000b903.bin
60f4cb9ac377b54ee844ed0161327813148b7e6be339cb934351236a4dfe3fec		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB903 10464 bytes
font_01_sfnt_off0000d0ac.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD0AC 16792 bytes
font_02_sfnt_off0000e8be.bin
11889ac0e6bf86328af17003f8d696574ccbe1499745cefa72f1df17907a2d15		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE8BE 16800 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.