Malicious PDF — malware analysis report

Static analysis result for SHA-256 83a215f60ba1c002…

MALICIOUS

PDF

73.6 KB Created: 2021-09-07 12:28:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 126e0d450f90ec77c44c564b4d3eb9f5 SHA-1: e4ddf2de686a134e1ed65e933bb547b2816a78d3 SHA-256: 83a215f60ba1c002e1bed71710dcd61c5efc4f32928d8d517cdab4f2b7387643
154 Risk Score

Malware Insights

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

The PDF file contains numerous links, many of which point to compromised CMS upload directories, suggesting a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier further support its malicious nature. No scripts were extracted, and the document body was unreadable, so the rationale is based on the URL heuristics and the PDF structure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6526

Heuristics 5

  • 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
  • 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://hitecds.com/userfiles/file/buvak.pdf In PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b425ea62893---totesugoranu.pdfIn PDF document text
    • http://rmgoals.com/userfiles/files/viziwifusasuwuranepokevop.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/92d21a19f39bbedcc74468dfe848aac7/34111373770.pdfIn PDF document text
    • https://seo-methodes.com/userfiles/file/zexisezifujetagezixib.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/07ddotejgc4qvl3megigkavgm3/15882801622.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0c731106d8---konukarubaxafawipagiwu.pdfIn PDF document text
    • https://partnyor.az/userfiles/file/72528313896.pdfIn PDF document text
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/mv7mqrfqcfrds8nop1rg0lo5pb/wegivimijulikeda.pdfIn PDF document text
    • http://learnazia.com/fck/imagesfile/lufufepesubimeguk.pdfIn PDF document text
    • http://vladjurnalist.ru/archive/file/57886715504.pdfIn PDF document text
    • https://walnutcreekguide.com/wysiwygfiles/file/jojakezofi.pdfIn PDF document text
    • http://attep.com/home/sandbox/domains/heekee.com.hk/public_html/ckfinder/userfiles/files/47579078112.pdfIn PDF document text
    • http://fourfoods.com/images/files/73792847873.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d49daa834cf---resoropugerepesawute.pdfIn PDF document text
    • https://tuoitre.bacgiang.gov.vn/lib/ckfinder/files/65078399818.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac44830c14---jezajuzisizozepemol.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3d79c5637---52492137945.pdfIn PDF document text
    • http://frezerovka.by/images/fxeditor/file/xesabavefigawavusowokori.pdfIn PDF document text
    • http://iwishop.hu/file/futugid.pdfIn PDF document text
    • http://aexpress.lv/index/images/up/file/62595907922.pdfIn PDF document text
    • https://mamalight.net/business_school/uploads/file/forosemij.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/c920ce2ae7632f01df47aee371c1efc3/25222512115.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=plant+cell+and+animal+cell+comparison+worksheetPDF link annotation
    • 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_off0000c74f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC74F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000df61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF61 16000 bytes
SHA-256: 60247ca09635e5d50c0387ce76400a6e7d6d13298880093549bc19422d7898f2
font_02_sfnt_off0001085e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1085E 10956 bytes
SHA-256: 9294826477fe17c0528757ed1735c967cc9c2c1428f3df3b0a4ed4863a384869