Malicious PDF — malware analysis report

Static analysis result for SHA-256 be433c178ffd2686…

MALICIOUS

PDF

92.5 KB Created: 2021-08-03 16:14:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: dde0f00b6b552bea5b04e8a75ed70391 SHA-1: e3b043314dee3abff18bd2c0bdf1165f65a46e21 SHA-256: be433c178ffd2686475aa3ee05df869312968707a3c94d702bc9755c383aa0d8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to distribute malicious content. While no scripts were explicitly extracted, the nature of the URLs and the detection indicate an attempt to lure users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099b2cd5cf22---polaluxobexozavojape.pdf In PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e87218b3a0---nutes.pdfIn PDF document text
    • http://yanarfabrics.com/firma/files/8028805546.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1608528300b96d---26321937663.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609e9718ba7ce---fonujugodowumexamomow.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160caed2e49dae---68349420385.pdfIn PDF document text
    • http://slphs66.com/clients/e/e6/e62fa13cff665df70d7481f632b33819/File/fanalibapete.pdfIn PDF document text
    • https://monocroma.it/wp-content/plugins/super-forms/uploads/php/files/29fa5b3f91d6ddac6189be01a62285ab/xudifijop.pdfIn PDF document text
    • http://maxidmum.com/images/upload/fck/file/64847898001.pdfIn PDF document text
    • http://www.bash.cl/media/file/29771798483.pdfIn PDF document text
    • http://thaiboxes.com/piceditor/file/11893108064.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/af791b4b1bb6f3a830dca9c25ac03e70/19457970133.pdfIn PDF document text
    • http://appletechsolutions.com/userfiles/file/25421715580.pdfIn PDF document text
    • http://haithuanphat.com/uploads/files/mifuti.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-5-2/20210502204600370929.pdfIn PDF document text
    • http://iowatriallawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/12587361479.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/manedi.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/5bs6vv634mr1qj4bj18227fb15/sixutipuzesubapuroxupid.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608e270abadd9---mirodujivibig.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1ece810ab---bimonapiloleluzebo.pdfIn PDF document text
    • http://bajcsidavidfoto.com/_user/file/81896008727.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160804c989872f---rogatiwewizof.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=parallel+lines+and+transversals+worksheet+gina+wilson+%28all+things+algebra%29+2014PDF 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_off0000fc38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC38 19232 bytes
SHA-256: 1aad07c45350911a4d50f745dbd23ff7d5c60ff4f1c29e769d9ef1bc5dd603fe
font_01_sfnt_off00012fd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FD1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000147e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147E8 11440 bytes
SHA-256: 12a3551b63b751697215662c48ad613db8e10a6da761e2bb8884140f3ea30cb8