Malicious PDF — malware analysis report

Static analysis result for SHA-256 f401fc609d1bd5fd…

MALICIOUS

PDF

85.5 KB Created: 2021-09-20 06:53:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7e256eb2d94db18a00074c15475c390f SHA-1: 022382a76dee64cbc1d0314b267e10278564fd64 SHA-256: f401fc609d1bd5fd190b9efd15658ef08fe028c099beb72037e675b1002177b9
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and ML classifiers, indicating a phishing or malware distribution attempt. It contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document also instructs users to scan a QR code, further supporting a phishing or social engineering attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 8

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://avtosfera28.ru/userfiles/file/3622743781.pdf In PDF document text
    • http://ukrainski-rosyjski.pl/userfiles/file/91188316325.pdfIn PDF document text
    • https://holcom-wd.holcom.vn/webroot/img/files/86478361387.pdfIn PDF document text
    • http://epoch-making.jp/js/upload/files/65730384513.pdfIn PDF document text
    • http://shengnabei.com/uploadfile/file///2021090901460954.pdfIn PDF document text
    • http://aktifithalat.com/resimlerfiles/51188555429.pdfIn PDF document text
    • http://xn--939a66v0zjo3bcvdmrp.com/data/ckfinder/files/lakusawotu.pdfIn PDF document text
    • http://kimkhimientrung.com/uploads/image/files/78986529170.pdfIn PDF document text
    • https://rsun.pro/admin/ckfinder/userfiles/files/bofepixajemewilot.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/f72dba918ca337c8259ef54836802ea4/57964393320.pdfIn PDF document text
    • http://kleinschaden-expert.de/userfiles/file/19524955837.pdfIn PDF document text
    • https://silky.ae/images/bulk_images/files/39066099308.pdfIn PDF document text
    • http://nensi.si/upload/file/pazilefirowojiboka.pdfIn PDF document text
    • http://jindi2010.com/uploadfile/files/bodig.pdfIn PDF document text
    • https://stef-nancy.fr/upload/document/raxufunepetibazik.pdfIn PDF document text
    • https://fleschimmo.lu/userfiles/files/numubunukiparaxen.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161317634a947f---47088260591.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16133a61e3af22---sodivoto.pdfIn PDF document text
    • http://groupementpecheduloir.com/ckfinder/userfiles/files/viserologivebekobaji.pdfIn PDF document text
    • http://obrienbuilders.com/userfiles/file/sifumukad.pdfIn PDF document text
    • https://rosenstein.lu/userfiles/files/tewesekupuranaxa.pdfIn PDF document text
    • http://111-orte.com/testarea/cwsCMSlight/media/files/17266265991.pdfIn PDF document text
    • http://lignumweb.com/site/webroot/uploads/files/vigamutujoxegalirirofel.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/6a75209b2bce1499b00f2c3b3ed3d363/44005833753.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/zawobed.pdfIn PDF document text
    • http://partnercable.com/files/dojurizu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=transfer+from+old+android+to+newPDF 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_off0000e774.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE774 18464 bytes
SHA-256: d0a08af32ba2ae6e0cf2032f5aa539c224c5e0f72d9a0f010e7ad311c3422de0
font_01_sfnt_off000117b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012fce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FCE 10564 bytes
SHA-256: c9958e268ac732a40aafd64c2ee41e62354a062db6c2cb4ba75c90b0c404b6ce

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