Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d3ba97ada4c7378…

MALICIOUS

PDF

79.9 KB Created: 2021-09-13 03:01:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: aa20de42c8c3c54124c9ac9097b44632 SHA-1: c23b54f4938e917defdecd4c3aa53b6ae413856a SHA-256: 5d3ba97ada4c7378d36c54b0b1e9f1b2db6f6b292886ff7a87a7a573fe5986bf
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many embedded URLs pointing to potentially compromised or disposable hosting. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for human readability but rather to host links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://tiszaikaland.hu/upload/file/luwaxenegiwegadawadiw.pdf In PDF document text
    • http://greenearthgardens.org/userfiles/63881236749.pdfIn PDF document text
    • https://tideandtigers.com/ckfinder/userfiles/files/51682372405.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/kitinuzemorizigadiruka.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613de3636beb5---12189473212.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/072585742.pdfIn PDF document text
    • http://contactfm.be/userfiles/files/88565122198.pdfIn PDF document text
    • https://cnn-logistics.com/asset/files/53465844400.pdfIn PDF document text
    • https://highlander-inn.com/assets/userfiles/files/karovafotav.pdfIn PDF document text
    • http://groupkaishan.com/d/files/51886416976.pdfIn PDF document text
    • http://abwingsva.com/uploads/files/nifukozutog.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/tu69usnqu2jtvv8nffgjp6k4c2/kuzuvupi.pdfIn PDF document text
    • http://st-johnson.com/Uploadfiles/files/delotadabemogajik.pdfIn PDF document text
    • https://vinocastillo.hu/editor_up/51346822745.pdfIn PDF document text
    • https://mrpressconsulting.com/UserFiles/file/43986268399.pdfIn PDF document text
    • http://ddaengshop.com/ckupload/files/savupivamesazazari.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613587961882f---zazepoxuvekomemabum.pdfIn PDF document text
    • https://brahmagnanam.org/fck_uploads/file/56390669282.pdfIn PDF document text
    • https://chungcungoaigiao.vnpec.xyz/uploads/files/65319973511.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/6060c39de5ab57a684e61a23df64722f/delujawutinogegopus.pdfIn PDF document text
    • https://barrierball.cl/ckfinder/userfiles/files/84535044770.pdfIn PDF document text
    • http://khacvietlaser.vn/public/images_news/files/sulozomib.pdfIn PDF document text
    • http://krzeptowski.pl/file/lapojozuminavibadikogo.pdfIn PDF document text
    • http://futsalcb.cz/picture/vtextu/file/41476407084.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=best+online+ios+games+to+play+with+friendsPDF 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_off0000d148.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD148 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e95a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE95A 17940 bytes
SHA-256: 70793a2fbd7d447b8c15e693190da8c31f2af54dd6348fe37eed4adc8e746ee1
font_02_sfnt_off00011765.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11765 11200 bytes
SHA-256: caea09eff8fb77303e6b5b978dd3e1b526c71ddb151baedd6bc50e6dae613791