Malicious PDF — malware analysis report

Static analysis result for SHA-256 5952d972260414a6…

MALICIOUS

PDF

81.6 KB Created: 2021-08-13 18:31:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 4d9cf633c0021cc35c52f311465dd721 SHA-1: e940c240456965eda61ef3d93e01740b6b57bbe1 SHA-256: 5952d972260414a67eafa1e2f3f5aeeef4652b929fab00f02e09529a3fc8bd88
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of links, many pointing to compromised CMS uploads and disposable hosting, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://szolnokepul.hu/userfiles/file/xafizajagiw.pdf In PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606ceacc412fb---14420342611.pdfIn PDF document text
    • https://aedwea.com/upload/foto/16401520121.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/5e6780a1cfd386a3138144c86edb7fbc/77058459824.pdfIn PDF document text
    • http://phelieuviethung.vn/upload/files/44288713091.pdfIn PDF document text
    • http://jyotiacademicpress.org/uploads/file/68953110581.pdfIn PDF document text
    • http://ewinghighclassof1963.com/clients/e/e4/e4cb61fc1babc639533983e887b7272d/File/mamapawubizutenaxo.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/40ce023aef9db67c746d756fc50a9c91/fuweparerujuxuputuwu.pdfIn PDF document text
    • https://eccdc.org/application/webroot/userfiles/file/jiferukofekuxuluxowosefa.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16104a07ab2858---vaziwusugoxesoza.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160f71662a8ae4---zitegunatifojogelagifet.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/3938398415.pdfIn PDF document text
    • https://louvre.lv/res/wysiwyg/file/78851871801.pdfIn PDF document text
    • http://project-lovcen.me/userfiles/file/febinasaxeriliraketusulu.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/56375532248.pdfIn PDF document text
    • http://booklandbooks.com/userfiles/file/67263255452.pdfIn PDF document text
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/rafupapalonuf.pdfIn PDF document text
    • http://ducthoaudio.com/upload/files/dijira.pdfIn PDF document text
    • https://verandapattaya.com/userfiles/files/didowagarito.pdfIn PDF document text
    • https://hondamienbac.vn/userfiles/file/55872262712.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/16085794f430aa---kabavaza.pdfIn PDF document text
    • http://fxmeat.com/upload/file/dfc16be52e75627dbad65adc2f69a5b4.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160811ff4e344f---piverekof.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/mafegow.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/ff5dcltuilpqcbk88ah1h89s75/87530452810.pdfIn PDF document text
    • http://phayaotechno.com/UserFiles/File/70267000875.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=intro+template+cinema+4dPDF 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_off0000d9c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9C7 17200 bytes
SHA-256: ba5b87cf3fa2757c6f77aab55d09b65ba3ef19eb859aeb4e77549348d9425fee
font_01_sfnt_off00010646.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10646 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E5D 10536 bytes
SHA-256: 966a3848276a75d846bf3429733eafcaaca10f66f30a9b5d0aaaf2777ab94562

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