Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd1c6b80b922fa96…

MALICIOUS

PDF

98.3 KB Created: 2021-06-30 04:51:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 78427e3e6ebfdb2f9fcac73f51d4ec47 SHA-1: 64079f5595fa27daf75d9b407c5497e8f0316497 SHA-256: dd1c6b80b922fa968f9bf7440566ace4a1e9107f8ef26a171688ef6548bea09e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm directing users to multiple URLs hosted on compromised CMS upload directories, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

Heuristics 6

  • 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
  • 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://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/a8db7165380988ccaa9bb125dca394fe/70565011724.pdf
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608171c175757---bililinera.pdf
    • http://laser-piskovani.cz/democms/userfiles/file/nerasamolovutemokusabajis.pdf
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607903eb5975e---mamoxefutijenojebobeb.pdf
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c21690d17c7---95074526651.pdf
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cf6ee4262cc---87549433687.pdf
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/3690145d42ba7733fb8f213b84f4bb49/wuwufutojojule.pdf
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608d7d1355fb3---12435979807.pdf
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/160bb28528bdb1---koragenoxulipegipoj.pdf
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/28b3e05b597c0d8356d2bfe214c26084/60980222823.pdf
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/ff2f182177bf2eb06b4266c90fc6146e/68990758017.pdf
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/160764039bf0a4---letuzas.pdf
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b86d641a380---41519279972.pdf
    • https://floridaholidayplanner.com/wp-content/plugins/super-forms/uploads/php/files/f191641114933b838d4efe8d4955c8eb/55109166223.pdf
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/f2fikit0kokp963sdo9v3i0037/gejugi.pdf
    • https://www.visitrwanda.com/wp-content/plugins/super-forms/uploads/php/files/d27020a8b1ccd75aaa1cb03ed19d2d9c/tipedamelubikadosobi.pdf
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/ec690b87af35e3267c0b6156fc221a15/pofowuninafuxemikivusa.pdf
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/799b3614de54149e6bcb6a417a916926/tezinik.pdf
    • https://sjalikave.hu/pictures/file/jonajawemoxutarara.pdf
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5f08a9f44f---18655552124.pdf
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160ce177208dd4---53672059683.pdf
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/6r24k51qg95j2a93b36utl8akq/rojuzop.pdf
    • http://alnadaoil.com/userfiles/file/nitome.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=cheese+similar+to+brie
    • 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_off00011e6f.bin
a3287278cdf262217dbc67acda3f627f715c053e666427988461f7206cffe922
pdf-font-stream PDF embedded font (sfnt) at offset 0x11E6F 18020 bytes
font_01_sfnt_off00014c26.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14C26 16792 bytes
font_02_sfnt_off0001643d.bin
f8cb86bd7554e555048110fccc635d60d2f25e347639a566461b9bc9230026e5
pdf-font-stream PDF embedded font (sfnt) at offset 0x1643D 10440 bytes