Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ad9aa6ebb45a4e0…

MALICIOUS

PDF

83.9 KB Created: 2021-09-18 05:16:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ca2793d1da08e63ec83a8761627c5867 SHA-1: e8826919bb9ff840dc1ed9d314828e201e72161f SHA-256: 5ad9aa6ebb45a4e0fba3909602792d52f86b04c3edc69c3ab112bb9dff9eafa2
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery through these links. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL structure and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://drumlockingclamp.com/FCK_Editor_Images/files/paduza.pdf In PDF document text
    • http://stellar.ru/ckfinder/userfiles/files/29716260626.pdfIn PDF document text
    • http://dc-42351dc5a6b3.prshots.es/uploads/userfiles/1631024993/files/gofuwebesejuveri.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/j5rvmtk45jhv9s1674gp0k36t3/matuxijerivodovevava.pdfIn PDF document text
    • http://ydyb.com/filespath/files/20210902042131.pdfIn PDF document text
    • https://adamant54.ru/userfiles/files/jufomo.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/hajrgt1iikc3o6vq3haimr2pvi/kagafi.pdfIn PDF document text
    • https://mystruggle.uk/indigo/ckfinder/userfiles/files/vagumugididama.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b7fdca8849---jugalajukuvixuzugudug.pdfIn PDF document text
    • https://economiadecomunion.net/ckfinder/userfiles/files/38736599492.pdfIn PDF document text
    • http://sanyosushiglendora.com/uploads/files/79362239868.pdfIn PDF document text
    • http://personal.sut.ac.th/chantira/port/ckfinder/userfiles/files/14025362083.pdfIn PDF document text
    • http://detskaoptika.cz/ckfinder/userfiles/files/88567323148.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fc3800acd2---pujosesitut.pdfIn PDF document text
    • http://missteenqueenuk.com/userfiles/file/42679500793.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140d649dcb38---20431733883.pdfIn PDF document text
    • https://hongmao.tw/uploads/files/202109111549151240.pdfIn PDF document text
    • http://sziazsauto.com/uploads/files/dakisabuset.pdfIn PDF document text
    • http://sbs-group.co/userfiles/files/71949827864.pdfIn PDF document text
    • http://culfordequestriancentre.org/UserFiles/file/gutuju.pdfIn PDF document text
    • http://urdu-hadith.com/survey/userfiles/files/12836092403.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613013a57c298---mejujefosuxa.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1612f406aa0919---77058416244.pdfIn PDF document text
    • https://dodomacnosti.net/data/file/tamimi.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/b8b536051fe75cd6b16493ddc1fd9de3/zapovamejobi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=xiaomi+mi+watch+unlock+bootloaderPDF 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_off0000e8bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8BF 10892 bytes
SHA-256: 2d39ab88bd0bc0839e04f70f359fc1fd3c9c0e16786f2e2428232ca7377c7d9f
font_01_sfnt_off000101c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000119d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119D8 15524 bytes
SHA-256: a5ba8f96fa404fc2989ca79d3c2ee8506f01b9f221aa152fa60e7be6b2e4e75a