Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6284f42292f4981…

MALICIOUS

PDF

87.7 KB Created: 2021-07-06 04:20:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 308430b60507510f1b86628e62fecad0 SHA-1: c86da763b4f3b091208141e741f17fccf3f17ddc SHA-256: d6284f42292f498144d210832d5a829b145f2aed7a01efd3929bef17cd7fab8e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, many pointing to compromised CMS upload directories and disposable hosting, indicative of a link farm or SEO manipulation scheme. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. While no scripts were explicitly extracted, the nature of the links and the detection suggests a phishing or malicious content delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 http://urduhadith.org/survey/userfiles/files/saweradadomewipaj.pdf In PDF document text
    • http://www.ochoadentalcare.com/tacgestorcontenidos_ochoa/documentos/file/In PDF document text
    • http://vaness-sens.fr/ckfinder/userfiles/files/29295653239.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607cbafa8a2a8---60603583570.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/98692328765.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c2f8397af68---pavekiluli.pdfIn PDF document text
    • https://acornschoolcharleston.org/wp-content/plugins/super-forms/uploads/php/files/29e6f5e411cddef79a1337a2c8e91679/wijoniwuge.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16085903f92bb2---jaterofomu.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/vf24t83j9eseep2450r3ts3bt1/52273136741.pdfIn PDF document text
    • https://www.treehousecare.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff06ecd8d5---benebikilar.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/h507i1mmpij4cjnubphe0kvp85/38296097974.pdfIn PDF document text
    • http://urgentcarepb.net/userfiles/file/70555141812.pdfIn PDF document text
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/d8b6e705cea6c97a3e22206c53395392/kememuxafutewajiw.pdfIn PDF document text
    • https://free-spirit-city.eu/uploads/wysiwyg/files/95336688896.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3a5814ebd---pikovixefazukukoruragosuj.pdfIn PDF document text
    • https://www.temsilcifirsatlari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160865dc72b6c0---70014523653.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b834cad486b---30966109445.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a85c07f1058---jotimolazedejul.pdfIn PDF document text
    • http://logisticsnetworks.net/ckfinder/userfiles/files/38341444130.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d80f320fdd---bunanirojexu.pdfIn PDF document text
    • https://iguanapools.com.au/wp-content/plugins/super-forms/uploads/php/files/6ioj1c19u35bloac3fc8n3g6qj/ninonibobebol.pdfIn PDF document text
    • http://cateringkieuan.com/uploads/userfiles/file/lapumidesumigate.pdfIn PDF document text
    • http://droprint.my/home/ququ4923/public_html/userfiles/file/demufuvinu.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c41be3d9902---bovukajemir.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/savuzuvazasugepanevo.pdfIn PDF document text
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/0c09707af0261c992719de2ead7eb159/jibadix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=i+can+never+sleep+at+nightPDF 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_off0000f5db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5DB 16684 bytes
SHA-256: 6cd02af3c6b648315078c71fb84e57764eaebb2150a1ba96cbb6f657b6bc15ee
font_01_sfnt_off0001214b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1214B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013962.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13962 10552 bytes
SHA-256: 8d4518d68c5407464d55a5a6465921ee8e1c20d8a82c8b3c753a3ebe81ad53f3