Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c95c4426b214266…

MALICIOUS

PDF

81.0 KB Created: 2021-09-20 23:15:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a2cbef4520a57f1662c35e92fb2e9550 SHA-1: a1f9ca1df74b974ac1c6aeef8f03e11fb042d796 SHA-256: 9c95c4426b214266cdd8c2cb4eac34b29219c0ec4765ea5e45fac5df115b1178
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm directing to multiple domains, many of which are hosted on compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, so the primary attack vector appears to be social engineering via the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/f580ab567e7a3ea6daf361181b5d0f5f/71300001610.pdf In PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fac8516d5d---relizaput.pdfIn PDF document text
    • http://teenmag.cz/userfiles/file/57760223453.pdfIn PDF document text
    • https://jurad.eu/files/file/59637124382.pdfIn PDF document text
    • https://rafautama.com/uploads/file/16281567660.pdfIn PDF document text
    • http://rockhouseschool.com/rockhouse/uploads/files/92110007385.pdfIn PDF document text
    • http://technimexvn.com/images/ckeditor/files/21613139984.pdfIn PDF document text
    • http://tzoetemondje.be/uploads/files/kudawusulajutuvowino.pdfIn PDF document text
    • https://betsin.org/userfiles/files/xewewapefeviko.pdfIn PDF document text
    • http://klick-tipp.at/ckfinder/userfiles/publics/files/tatinirujumipekamiguzadi.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16138c6ae46eef---kujutogagowolopetari.pdfIn PDF document text
    • https://rajatotogroup3.com/contents/files/97412878139.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/1613a168b4d087---giwejozikowuf.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/hdddqdeev9qem4uangqhq0a4gr/50652854151.pdfIn PDF document text
    • https://tyko.pl/userfiles/file/44356958643.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/026bee71918ba0c2aece4a1d19382ac0/linirexupesiwe.pdfIn PDF document text
    • http://www.logistiekverbeteren.nl/ckfinder/userfiles/files/54954922611.pdfIn PDF document text
    • http://imbirimbir.ru/files/gidopepitepur.pdfIn PDF document text
    • http://precisao.org/files/files/detibominajo.pdfIn PDF document text
    • http://xn--b1agaa2anfqdp.xn--p1ai/ckfinder/userfiles/files/82910934588.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161300b5d2766b---ridelifidusop.pdfIn PDF document text
    • http://happyorderfood.com/uploads/files/2328875869.pdfIn PDF document text
    • https://searchkar.com/ci/userfiles/files/81086678258.pdfIn PDF document text
    • https://onutglen.com/caningest/images/file/46554679772.pdfIn PDF document text
    • http://donauwell.at/userfiles/file/49988463928.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=how+to+update+android+sdk+in+unityPDF 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_off0000d63d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD63D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE4F 18344 bytes
SHA-256: 4fc237074075d06a2e6502cf0a2bc2d160a943c22942c121c48f3c7e16d5b06d
font_02_sfnt_off00011e01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E01 10720 bytes
SHA-256: 7a24f85eb63ed249f65efa22ce8a07ba88d0763798c17959327f5f0c394110cf

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