Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6e64115b21d903d…

MALICIOUS

PDF

73.6 KB Created: 2021-06-30 14:46:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bf3c5cdb0fe143950e3a95e05228afd1 SHA-1: 7dbc8c34fbf9543b4f93fdbec31b95749a1540b0 SHA-256: f6e64115b21d903dd9dff915e46d9d54f9b125fe15de3786180cb9603f97a7ec
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal the PDF contains a link farm pointing to numerous URLs, many hosted on compromised CMS uploads or disposable domains, suggesting a phishing or malware distribution scheme. The document body was unreadable, but the presence of numerous external links strongly supports the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://s8radziejowice-paszkow.pl/userfiles/file/kalaju.pdf
    • https://burkina-businessschool.com/business_school/uploads/file/86884357482.pdf
    • https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/bd9c164d1abc10850e01513e398845ce/82554674610.pdf
    • http://xn--or3bi2da319p.com/upload/fckeditor/file/kiraxujulavesuloz.pdf
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082b5929fb7f---lawawajukajevapo.pdf
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/4acd53d8ca3850217d7c35346a859b1d/16619110076.pdf
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/4e4ebc932ceea7c3f25b192c072437b7/81910569052.pdf
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/7e0ba732ce2d51c8fda9f4b0b8a2a920/70447666647.pdf
    • https://agronlogistics.com/userfiles/files/jokesap.pdf
    • https://ratsimae.eemedia/contents/file/sapulasuwubus.pdf
    • http://inter-travel.hu/_user/file/mojabu.pdf
    • https://olgapopovaphoto.com/wp-content/plugins/super-forms/uploads/php/files/3825b943a6080e12566a435061bb27e8/72522568200.pdf
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/dec86dbdabae3915f23071655b048e1d/19246875506.pdf
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a22dfa98078---pekuxalex.pdf
    • http://szentimresiklos.hu/upload/file/buxiwavipafutad.pdf
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ab5990d024---21759826082.pdf
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/bcebf9cc00feba041c619ef9f9b76511/gibotopub.pdf
    • http://pcccphucvinh.com/upload/files/78753349235.pdf
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a84632034f7---11138395212.pdf
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160780133f35ad---bagagadidiba.pdf
    • https://diphong.com/uploads/tixakuguvefila.pdf
    • http://bjsprt.com/uploadfile/file///2021052300322979.pdf
    • https://powermailer.in/userfiles/file/54259820611.pdf
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607eac0767f75---57098122868.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=alexis+ford+double+penetration
    • 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_off0000bf1e.bin
2d68c14a314c59ea850f06c2d6a0fd22e6701c55058747ad48cece6b7da8ecd8
pdf-font-stream PDF embedded font (sfnt) at offset 0xBF1E 10816 bytes
font_01_sfnt_off0000d804.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD804 16792 bytes
font_02_sfnt_off0000f016.bin
b396787e2dacfcd8c2f6c9170ac0cc352d835f200ce0fa9ea800191337d1cdb3
pdf-font-stream PDF embedded font (sfnt) at offset 0xF016 16016 bytes