Malicious PDF — malware analysis report

Static analysis result for SHA-256 d18c7ae615bb0a09…

MALICIOUS

PDF

174.0 KB Created: 2021-07-15 13:11:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 6acfbfc0e6cb6120a22cfc6e344e7826 SHA-1: 1d0d25520f7f5c4ca7ad0fd3835dc6e655407702 SHA-256: d18c7ae615bb0a0971616b48050232793d6fd808b9f87fb8f55a422a7894c0fc
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains a link farm pointing to numerous PDF files hosted on compromised websites, suggesting a phishing or SEO poisoning campaign. No scripts were extracted, but the presence of multiple external links to potentially malicious content is the primary indicator of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9825

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://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/7aqap67dbfgu5e5vqj0erkkk35/kazenigifunipovivamon.pdf In PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/5mvl3kak166874iufjeh5bo2p0/taruvozapogesav.pdfIn PDF document text
    • http://artecgroupservices.com/imagenes/file/55047068398.pdfIn PDF document text
    • https://shaplaconsulting.com/app/webroot/ckfinder/userfiles/files/fowugatudibepomiru.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1608c3f7a9e5c2---malal.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/h7htdlv48fcludmvgen1ts8nl5/dizopezulatilididawap.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b7a462ae6e0---39627954191.pdfIn PDF document text
    • https://hzautomatisering.nl/userfiles/file/38828833114.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/u1muluqu7s1dekb4lj531abgcv/73872885045.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16091efb0b5fe2---52988337201.pdfIn PDF document text
    • http://gsmontaggi.it/userfiles/files/vejutufitomufutesa.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/1607f62595ad24---54668536565.pdfIn PDF document text
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/8889c90c344888ff8b9dc19ce98ec2f2/85501539058.pdfIn PDF document text
    • http://zkojicin.cz/userfiles/file/nanugefip.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c3d057b7e1b---80554692743.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16071764b7881a---62018110976.pdfIn PDF document text
    • http://tydafa.com/dafa/uploadfiles/20210622185403.pdfIn PDF document text
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/0c831484ee744f005f25e2930dec3db9/95081367472.pdfIn PDF document text
    • http://daehwa.info/uploaded/file/buzapubusexaniges.pdfIn PDF document text
    • http://hurtmar.pl/Upload/file/lutez.pdfIn PDF document text
    • http://sva-jeanroze.com/xmedia/file/wokiligu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=most+abundant+type+of+cartilage+in+the+bodyPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0002303c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2303C 19060 bytes
SHA-256: 4527c96c3362b799bab2817c302dca9997f8cd6673d835692cd003fdd4d7314a
font_01_sfnt_off00026250.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x26250 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00027a61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x27A61 16168 bytes
SHA-256: 9444e4cba4f3f12f93f6279c336b69ac7e8979fe57769abced50af79e14b2d56
font_03_sfnt_off00028ff3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x28FF3 11244 bytes
SHA-256: ccb8491aa20ca4863a49f65ce577b74f2041fa7d77889fa60509a8003c2b5a9f

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