Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3ee581c04ffa283…

MALICIOUS

PDF

92.3 KB Created: 2021-07-02 05:32:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f8acea3d6a311f249ecc7121446d4972 SHA-1: f5fe7920a42052fed709f1bfde61909e6f01a3d2 SHA-256: f3ee581c04ffa283cde4cd829c317e95fe8d335ce7da64865c6b4fd6cc2ad7ce
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised CMS upload storage and disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded URLs and the PDF structure itself are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/52deef5f8c7ec03664cc5347fc773206/seguvijufobovenugebu.pdf
    • http://whatdwellswithin.com/file/vuselixofimar.pdf
    • https://healthmatters.me/userfiles/file/pajerarividavewam.pdf
    • https://anmimar.com/royal/userfiles/file/lofiwaputikir.pdf
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/erlusp7g7rn42pa8a9dqff1i4h/1062377583.pdf
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160810e01d37dd---nomodu.pdf
    • http://sjhrz.com/images/upload/File/jazinazuvozeluzoded.pdf
    • https://nhachoxebus.com/upload/fck/file/zipiwelukilogowesab.pdf
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098762287151---4504135895.pdf
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082a2c70cb4d---kepuzudemigutaro.pdf
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/5hav1micr5pvl832jptgum3ra2/kewigudotejirimisapumez.pdf
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/75fefe4052454c095658df776e623b71/71556143831.pdf
    • http://centroolosprato.it/userfiles/files/poduxuneribavabeves.pdf
    • http://twfbs.com/ckfinder/userfiles/files/36992948934.pdf
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a99036d40d5---jomagekazase.pdf
    • http://sl1971.com/clients/5/51/517263f0417f9379c67e6eba0e0bdfe8/File/68105370764.pdf
    • https://mannerfeltdesignteam.se/ckfinder/userfiles/files/61916420426.pdf
    • http://saharun.org/uploads/ckfinder/userfiles/files/basij.pdf
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c9a3b55349c---zunaxarobari.pdf
    • https://pypconsultores.mx/userfiles/file/kunukuninogesorugafatane.pdf
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/mgu2n52sf60qub28ub1e1aulan/tabuluzapezawuvobevikuki.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=list+of+foods+for+a+balanced+diet+minecraft
    • 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_off00010470.bin
aa9cbcf1554acb4a7de763892e34bb9fbb6b9808f70239e0f96d777e6dea35ed
pdf-font-stream PDF embedded font (sfnt) at offset 0x10470 10732 bytes
font_01_sfnt_off00011d13.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11D13 16792 bytes
font_02_sfnt_off00013525.bin
9d001edf81ef48edd257528b28a1db6d1b98a54df394e21556740566604018c8
pdf-font-stream PDF embedded font (sfnt) at offset 0x13525 17300 bytes