Malicious PDF — malware analysis report

Static analysis result for SHA-256 fecba0c8f2f30552…

MALICIOUS

PDF

75.9 KB Created: 2021-09-06 05:29:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a6a4aff9dac5c5721f003ec00a13bc84 SHA-1: 54ba5035f3e93cf99de5eb39a0dadeb3400a131d SHA-256: fecba0c8f2f305525dd640fe26696952a6d41c662a264f1f941e6a3559e38466
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. Static analysis revealed the document functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS upload storage and disposable domains. These links are likely intended to lead users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://xn--h49al33a2zdp0eo1x.com/DATA/file/20210604122707.pdf In PDF document text
    • http://drironcat.com/images/file/58590012032.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1608b666878857---winadozugakufedoneg.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1896ee5de---dakepupevu.pdfIn PDF document text
    • https://classykitchen.pl/web/uploads/files/molojofev.pdfIn PDF document text
    • https://bodegoncriollo.com/userfiles/file/31001582387.pdfIn PDF document text
    • https://medtek.vn/storage/file/4598605019.pdfIn PDF document text
    • https://eghamatyab.com/basefile/bainbookcom/files/11398211350.pdfIn PDF document text
    • https://apoiotelecom.com/imagens/img_fckeditor/file/69204326226.pdfIn PDF document text
    • http://cariboohose.com/userfiles/file/vupizofavavojabimoxuxus.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/112faff96146882a795056c825561855/79793969205.pdfIn PDF document text
    • http://mictrogiang.com/userfiles/files/sezamexew.pdfIn PDF document text
    • http://casier-a-bouteilles.fr/file/ketiwijifunamigetoz.pdfIn PDF document text
    • http://stringquartet.biz/web/images/fck/file/86174509108.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1607256c1e2f56---83383043672.pdfIn PDF document text
    • http://w-f-l.de/user_img/file/72223745154.pdfIn PDF document text
    • http://ntep2008.com/UserFiles/File/6629410889.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/5b8013323613156069b9f5e3dc7db7c1/89559880563.pdfIn PDF document text
    • https://stollerco.com/testingsites/advantage_aviation/assets/media/file/botefeturibevilemuruke.pdfIn PDF document text
    • http://top1np.com/ckfinder/userfiles/files/27318940605.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/v9v6t4o3kdcmfv0hjhnqeuthog/25945518320.pdfIn PDF document text
    • http://sevennews.com.br/ckfinder/userfiles/files/wazikoxa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=srimad+bhagwat+geeta+in+odia+pdfPDF 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_off0000c220.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC220 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000da37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA37 11032 bytes
SHA-256: 62beca6fd8925296504c6aa21efdf2980bd915d474a15e7492a87cab1c892f5d
font_02_sfnt_off0000f350.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF350 18156 bytes
SHA-256: a7146fddbfc32f51826988adcc1f3f347a50fb221bac73cb49ad80792981a4d5