Malicious PDF — malware analysis report

Static analysis result for SHA-256 156e91e1b97f63e1…

MALICIOUS

PDF

76.9 KB Created: 2021-07-26 17:11:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 97109e5d706ce93021dacd70547e157e SHA-1: 94f5ac6232fd30edfc34682f5900b1b67b688921 SHA-256: 156e91e1b97f63e1b195b9d267eddcde038da6928d43de8241ce5f1a64e4ade4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm with numerous URLs pointing to compromised CMS uploads and disposable hosting, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious sites. No scripts were extracted, but the structure and URL patterns are consistent with phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://anfauglir.com/images/file/9147357159.pdf In PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ada68c558a1---30870407392.pdfIn PDF document text
    • http://ttlh.vn/storage/ckfinder/files/sugugisojeja.pdfIn PDF document text
    • http://nature-revive.org/files/file/2112677172.pdfIn PDF document text
    • http://vnndt.com/Images_upload/files/75713229046.pdfIn PDF document text
    • http://cisseo.net/userfiles/files/wajivigaluzusepub.pdfIn PDF document text
    • http://christschoolblr.in/userfiles/file/korukixubufine.pdfIn PDF document text
    • http://montagnobozzone.it/userfiles/files/morunowikigusuw.pdfIn PDF document text
    • http://caphegiabao.com/upload/fck/file/13780531921.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/2dccff9b6e022575a637a2f619869a39/tigexugurusozu.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/16074c73e94675---xorenumajogaf.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/5d3e5e486f6023cd350fa24cecdb9b55/39091539232.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/iqijm8k9otgbvdjc23hj86hc4q/divolaxanafavetamosol.pdfIn PDF document text
    • https://digireg.nz/upload/43208670420.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa3dca354df---pevududasiwimurigemisawi.pdfIn PDF document text
    • http://guanzhuli.com/userfiles/file/mugowegonaditigipivako.pdfIn PDF document text
    • http://ctkupavna.ru/upload/file/zevalasigizulegulokunato.pdfIn PDF document text
    • http://riversedgefm.com/files/file/tibomunexawowowipi.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/kilugmmoo1ek3ssc90nlnop8r3/vesomelanuj.pdfIn PDF document text
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/64d0e9438d012647a5d59c87024dc821/22957641266.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/bolatuvosifuvo.pdfIn PDF document text
    • http://siltherm.com/ckfinder/userfiles/files/vegoviwatumafatibawar.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078d7fe6dd4d---tuxobavesad.pdfIn PDF document text
    • http://americusfelderfamily.com/clients/0/0c/0c5e5e27a4da9db51eb23c24aa0fa274/File/tukomezulowu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=making+declarations+biblePDF link annotation
    • http://s292376414.onlinehome.fr/datas/imgmail/file/9174300445.pdfIn PDF document text
    • 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_off0000c7f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7F0 10768 bytes
SHA-256: 81d3ab8e5380a81182f8ac4b76131ad1abbacedf27dbb93791c0ce5c17e50481
font_01_sfnt_off0000e0a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0A1 17300 bytes
SHA-256: 8605a64a4e551b92c871adc27d404571f555f7dacefeb969c8f3a7e328905520
font_02_sfnt_off00010de1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DE1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1