Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f15ee3bb50c3a3c…

MALICIOUS

PDF

88.1 KB Created: 2021-09-08 11:53:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2d16f5a09b2706cbcf9173350239df71 SHA-1: c818ffa152d0fcf3ad6e887f93a7bb5301bc1b02 SHA-256: 3f15ee3bb50c3a3ce8e2c9f9283ff7bb9dca429fe40f94939184f45efcce6c81
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress upload directories, suggesting a link farm designed to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and link farm heuristic indicate a phishing or malware distribution 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://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/160845a3363fdb---9690908772.pdf In PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160fe6d3090145---guludepifojomuvov.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef60c7595f---tafizumizakinozo.pdfIn PDF document text
    • http://apple888.vn/luutru/files/29388694049.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093129e75c46---23318535983.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/160f39901e064e---vidonew.pdfIn PDF document text
    • http://hasanmasat.com/ckfinder/userfiles/files/zodunuxer.pdfIn PDF document text
    • https://truonggiangcompany.com/userfiles/file/61481526776.pdfIn PDF document text
    • http://jatyn.cn/upfiles/202109/file/1630770704.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/2496111979.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/7577ebcf69ba7bdfa1d73819da3247c1/25861293530.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/4bopmhljh93987aufnp924667u/jexoda.pdfIn PDF document text
    • http://savalis.ru/userfiles/file/54929550061.pdfIn PDF document text
    • http://chothuethietbi.info/img/files/47297946720.pdfIn PDF document text
    • http://salonorganica.ru/upload/files/meramasumatekati.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/623975143.pdfIn PDF document text
    • http://lamorenj.com/userfiles/files/tivefuxekowinebet.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/remifawibe.pdfIn PDF document text
    • https://novahealthclinic.ca/userfiles/file/nofurawolej.pdfIn PDF document text
    • http://poltinka.ru/userfiles/file/40515449164.pdfIn PDF document text
    • http://karimeh.com/public/userfiles/file/59795711994.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd4e4677c9---dijeboz.pdfIn PDF document text
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/16093002a0764c---sinelobabowo.pdfIn PDF document text
    • https://fotinepmuveszeti.hu/kovagoors/uploads/files/49941319499.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/nsfckcjmifra7cf02jsu64m743/nuxazoxidizajetedalexez.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/obiv1unlf092i3kj8gskqt2j7b/waziterev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=general+medical+check+up+list+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_off0000f4ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4AB 17460 bytes
SHA-256: 95a4a92d85b260d6c93b249ebf7a729f99fef58ccde3492f61c2cfd7196fe491
font_01_sfnt_off0001214f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1214F 10996 bytes
SHA-256: e804100ce606ddec9f1deaf34cf17ff359b51523b58f669b6c41ffaa24371a33
font_02_sfnt_off00013aa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AA2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1