Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba45bfa3747646b7…

MALICIOUS

PDF

82.7 KB Created: 2021-09-03 05:19:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8447afb596d448f7d2d064a45cc8dbc9 SHA-1: 12f1e53c92119a7881bf274a2ff4b57965d5f091 SHA-256: ba45bfa3747646b7f9dd9983e2a95921619f38d91f15c1e9fa88ed3214d93eb7
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm hosted on compromised WordPress sites, with numerous links pointing to potentially malicious PDF files. The document body was unreadable, but the presence of these links strongly suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dba74b8065e---gazifusuto.pdf In PDF document text
    • http://bbfederico2.net/userfiles/file/ridekab.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/t0qg45l1m7qonnavm9te53ou8v/92363308930.pdfIn PDF document text
    • https://famecosmica.it/file/mitobudu.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b70616dd49---23457708960.pdfIn PDF document text
    • http://www.dilipprabhavalkar.com/images/file/12952587780.pdfIn PDF document text
    • http://ort168.com/upload/ckeditor/files/95381390984.pdfIn PDF document text
    • https://autotrans911.com/thread/admin/uploads/file/71758180806.pdfIn PDF document text
    • https://termofriz.rs//files/91526712315.pdfIn PDF document text
    • http://jjinline.org/file_upload/file/biresufuderawefatoxexadi.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/7uhsf3c5t5asajtevo97rtekpc/15921213655.pdfIn PDF document text
    • https://jxloanchien.com/style/postimage/file/jirewoferiwi.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/1o4vquojhjkoj8f19l4k55rl27/38149760671.pdfIn PDF document text
    • https://mayurherbal.com/userfiles/file/1595697700.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071a8d4ae464---jigoxavudinusoju.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/8l6n5unpu30pcgr5gt92o32jj6/karitavujuzigorenuponeg.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/62f5v50fsoia2ap3pt0jpn55n0/7798805190.pdfIn PDF document text
    • http://escuelasfutbol8.com/docs/files/14231656442.pdfIn PDF document text
    • http://www.evisiontiendaonline.com/ckfinder/userfiles/files/xenudijelubegiturosapira.pdfIn PDF document text
    • https://motelandratecuci.ro/userfiles/file/jidasu.pdfIn PDF document text
    • http://sentezetutmerkezi.com/upload/ckfinder/files/wuzaz.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608201ef7fc2c---zaxederam.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/4db3f4a7c16fe98e368a6bfcdb749239/11709964583.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-5-23/20210523175451624242.pdfIn PDF document text
    • http://na3.it/misc/file/56737230787.pdfIn PDF document text
    • http://ecompletecontact.com/ckfinder/userfiles/files/gifunerigexuw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=praying+the+rosary+without+distractions+pdfPDF 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_off0000dc71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC71 11156 bytes
SHA-256: 7d659e5e59379580747aecb09f92ac03e325ebecdd2d7f08487662ddbf800339
font_01_sfnt_off0000f659.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF659 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E6B 17960 bytes
SHA-256: 2b49d2c7a056065cbfab51cf7064c286aa4535cebcb750fd2b1d4245006fa02a

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