Malicious PDF — malware analysis report

Static analysis result for SHA-256 7df12a414ff64844…

MALICIOUS

PDF

74.5 KB Created: 2021-09-12 09:07:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4717eeb6926f67e07766cd77056cede6 SHA-1: e68c884bebb8a8ed170d548786a431aa0bdeb8b5 SHA-256: 7df12a414ff6484416e9b239e14ea6792e13304a9e4bacd0de505ae51e21b7f2
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many pointing to disposable hosting or compromised CMS upload storage, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of multiple PDF link farm heuristics reinforces the conclusion that this document is part of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://decaiyun.com/upload/file/210904180549196192921doex7rrhv.pdf In PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/16132112e32109---75381663012.pdfIn PDF document text
    • https://ghnservizi.com/file/wowalubapuwekuli.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/ca73cb9d0c5c8b1ba6663d0d93448fc2/diwaxovobogaduxodofema.pdfIn PDF document text
    • http://goodwill.pl/userfiles/file/podixefavexakibo.pdfIn PDF document text
    • http://c2ctrading.org/cms_upload/files/42727258754.pdfIn PDF document text
    • https://rasathantrananotech.com/ckfinder/userfiles/files/pupubizemukegoxezov.pdfIn PDF document text
    • https://sitarasign.ir/data/file/xisegun.pdfIn PDF document text
    • https://hophamthaibinh.com/upload/files/vigabubogeva.pdfIn PDF document text
    • https://farmaciasacoor.com/site/upload/file/setutapaxatoluruxitot.pdfIn PDF document text
    • http://phuwangnam.com/user_file/file/84905538861.pdfIn PDF document text
    • http://dreesmann-foto.de/userfiles/file/fowixukamodimateguf.pdfIn PDF document text
    • https://pelletier-tp.fr/ckfinder/userfiles/files/subekimajetokepubet.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/urlcl3ll3llni3ai8q7n6qj6r5/witisorezikosalur.pdfIn PDF document text
    • http://sictombbi.fr/ckfinder/userfiles/files/28193567578.pdfIn PDF document text
    • https://onderhoudnlgarantie.nl/upload/file/46886338819.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/78400398006.pdfIn PDF document text
    • http://gaushalango.com/uploaded_files/userfiles/files/57176512876.pdfIn PDF document text
    • http://sicilyontable.it/userfiles/files/zudew.pdfIn PDF document text
    • http://kitpaisal.com/mypicture/file/pezekaxidukisofixulit.pdfIn PDF document text
    • http://bbmeti.it/userfiles/files/vilekumigupimixora.pdfIn PDF document text
    • http://enjoyisagenix.com/ckfinder/userfiles/files/pinudobetidugubobaboripa.pdfIn PDF document text
    • http://kunbot.com/upload/files/15581549598.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/161383e1587769.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=watch+john+wick+3+for+freePDF 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_off0000c103.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC103 16860 bytes
SHA-256: 87725cfea571f131aef058b00d84b755910a8d9334ff1b3ec6a31cf56bf75ddd
font_01_sfnt_off0000ec04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC04 10692 bytes
SHA-256: fa54ddb7337721f2c111f5ef7caa33a7cdb285d8b61491d637df5f1df01ce42c
font_02_sfnt_off00010495.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10495 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1