Malicious PDF — malware analysis report

Static analysis result for SHA-256 b591436c7ef071a4…

MALICIOUS

PDF

77.5 KB Created: 2021-09-09 07:05:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7441a288177d42b3ea057e332ff2fd54 SHA-1: 9c9f7d36fead1d953673ef5a1dacf2ca5cc011e0 SHA-256: b591436c7ef071a4f886276ac9bdee199ff7948847ca536daa323edf0724dcb7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm or phishing lure. The PDF structure and embedded content are consistent with attempts to redirect users to malicious sites, likely for phishing or malware distribution.

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://drafthe.ru/uplcv?utm_term=how+to+cast+android+tablet+to+tv PDF link annotation
    • https://cyberbirddog.com/userfiles/files/65437110160.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/161311f1189d79---kusozifinimujap.pdfIn PDF document text
    • https://marlin-aquarium.ru/ckfinder/userfiles/files/jaliki.pdfIn PDF document text
    • http://szyuangang.com/UserFiles/file///sivorenewisarexu.pdfIn PDF document text
    • http://sspvjd.com/FileData/ckfinder/files/20210908_90E86FB932A76804.pdfIn PDF document text
    • https://mbzgogo.xyz/web/img/podborky/files/83992644434.pdfIn PDF document text
    • http://szentdorottyapatika.hu/files/biroduvixojopuxemif.pdfIn PDF document text
    • http://zagazzo.com/userfiles/file/migetanizepuji.pdfIn PDF document text
    • http://lenosada.sk/editor_uploads/files/70190763825.pdfIn PDF document text
    • https://247christianity.org/fckeditor/userfiles/file/82898611891630457483.pdfIn PDF document text
    • http://thesciencenetwork.org/uploads/files/movupi.pdfIn PDF document text
    • https://goldfieldssanddrags.com.au/ckfinder/userfiles/files/luxapawev.pdfIn PDF document text
    • http://henca.com/files/details/file/gopobikopasogidotujigod.pdfIn PDF document text
    • http://ryukatsu.com/userData/board/file/48207293859.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///nijojufidum.pdfIn PDF document text
    • http://laihoawedding.com/app/webroot/upload/files/rawalusorepa.pdfIn PDF document text
    • https://kaxtongroup.com/home5/maxconne/public_html/kaxtongroup/assets/images/newspostimages/files/18851474368.pdfIn PDF document text
    • http://dioceseofniranam.org/userfiles/file/rujanu.pdfIn PDF document text
    • http://www.cavice.fi/tiedostot/files/59309412583.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131a286d222d---56416838028.pdfIn PDF document text
    • http://paradisetourkorea.com/FileData/ckfinder/files/20210906_112EC916BF640548.pdfIn PDF document text
    • https://infypos.com/infyposcms/media/zeguluxe.pdfIn PDF document text
    • http://thuduchouse.vn/pics/file/gimojukobodatetanurusadi.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/3761abb65416395ca993fcc835fe09e2/kimebil.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_off0000ca8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA8C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e2a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2A3 10644 bytes
SHA-256: 7656370bbeb67dee88280cfa58f5e5b65bb9dbf2e4e800081609c4cc53c1bf0a
font_02_sfnt_off0000fb1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB1C 17420 bytes
SHA-256: 714842fa2589b4a7c7794d0b5d999c2c8a71a93400e9f05e56173644a73f3228

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