Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac6e3982e77dcdd3…

MALICIOUS

PDF

80.2 KB Created: 2021-07-21 21:50:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 54742ee04a5e82f7a72afe9f926bf58a SHA-1: 6c0fac49eaca32f36cd912d58f53cd1f47f69738 SHA-256: ac6e3982e77dcdd377d3229b290f9fa4fa96de81688c30df77bcf36eb9ffb2f5
164 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate it functions as a link farm, directing users to compromised WordPress upload storage and other unknown URLs, likely to facilitate further downloads. The presence of a 'download button' lure further supports a phishing or social engineering attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/f2b308d5c406d06781c44d8eb8641897/mufiruwuzidawi.pdf
    • http://9meclinic.com/ckfinder/userfiles/files/65616494239.pdf
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf5f771560---nebukap.pdf
    • http://emilygrilltogo.com/uploads/files/mozemokipinenedava.pdf
    • http://mediaworld.pro/ckfinder/userfiles/files/87141849988.pdf
    • https://aadhaarretail.com/administrator/imagetemp/file/96501468508.pdf
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607394e1518be---sobepadagomefalikafakitu.pdf
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609825865e43e---rupowukuwupupeg.pdf
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609f02b59d2b8---woxag.pdf
    • http://fixafilm.se/userfiles/file/wiziligurujunodo.pdf
    • http://nicosiacaffe.it/file/120710622.pdf
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/03700780422aa3cc9555cc294def6824/86721872797.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16081257d7103c---54673764388.pdf
    • https://birudongker.com/contents//files/44857307784.pdf
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160c060005257f---fegap.pdf
    • http://nyett.hk/uploads/news/files/71320866733.pdf
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609df86a5283b---95395178927.pdf
    • http://ronaldtan.nl/images/photo/bogelalaru.pdf
    • http://cancunday.com/travela/img/files/10065080056.pdf
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/1b7aaecba6258b2e927d9502d3c27c1f/7806008898.pdf
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/0bb6552413518cb961dfd4bf58b3a23d/59619963495.pdf
    • http://xn--e1aaafipco3bk8gra3b.xn--p1ai/upload_picture/file/94493584606.pdf
    • http://intergeored.com/upload/File/24455489741.pdf
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/950c443f470c8023fc6dcfdb48f48d4d/xakopiteririzagagif.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+convert+pdf+to+word+document+without+software
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d3c6.bin
b9b8b569b7b38621292b7f257ce671c71f33f575129d2b90b273096721fd1f33
pdf-font-stream PDF embedded font (sfnt) at offset 0xD3C6 17152 bytes
font_01_sfnt_off0000ffb0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFFB0 16792 bytes
font_02_sfnt_off000117c7.bin
d4f577fe883720ddb7f86012f03c2743528e60e4faa406ce19e2d50bfa5e5fbd
pdf-font-stream PDF embedded font (sfnt) at offset 0x117C7 11084 bytes