Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba672d69d0cb9091…

MALICIOUS

PDF

72.1 KB Created: 2021-09-03 13:48:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 93e8c04581ab4d3b7a5a11b1578c2ac8 SHA-1: 20547315a109fa0d44d9f51d6f2f80586a1d7ffd SHA-256: ba672d69d0cb909186dfae8b07cdeac376ef2a604fd31cdf0fa0d5165479bd85
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads or disposable hosting, suggesting it's used to distribute or redirect to malicious content. The document body is heavily obfuscated and unreadable, but the presence of numerous external URIs and the link farm heuristic strongly suggest a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://teplorium.su/userfiles/file/gizewi.pdf In PDF document text
    • http://france-ex.com/images/blog//file/mawamivemaval.pdfIn PDF document text
    • https://boucherienabli.com/uploads/FCK_files/file/19780355770.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a9ee7c6460b---tuwafatojutilifasigiwovo.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f07e63222a---xikokusixo.pdfIn PDF document text
    • http://meijialx.com/ckfinder/userfiles/files/jadejanuzafizezilefo.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/98958831903.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/b6cce32b988209e84b591ee1bb7f6bd0/47151218569.pdfIn PDF document text
    • https://okazdedziecko.pl/_files/Media/file/63917867311.pdfIn PDF document text
    • https://shoppingplanet.ro/ckfinder/userfiles/files/jetukivewuju.pdfIn PDF document text
    • http://radio-salsa.com/php/rs/filesupload/file/25789692951.pdfIn PDF document text
    • http://thaimassageboy.com/ckfinder/userfiles/files/migavanafapulereziparaj.pdfIn PDF document text
    • https://christianklein.eu/Quansis/ckfinder/userfiles/files/2586672954.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/f78e85a43222c1e34902041943e45f56/1320117702.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609cccabd0593---28340476860.pdfIn PDF document text
    • http://logo4you.dk/userfiles/file/botox.pdfIn PDF document text
    • https://kvkumariajnkvv.org/singhania/downloads/file/32951928547.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/bhouiagu1g9rsomumaotqv1c5d/fofunalijusumomojeku.pdfIn PDF document text
    • http://arabstina.com/ckfinder/userfiles/files/dadewozanevedomeveponazo.pdfIn PDF document text
    • http://wm-meyer.de/meyer/admin/editor/ckfinder/userfiles/files/patogupirukaguta.pdfIn PDF document text
    • http://erbaytag.com/resimler/files/93382908985.pdfIn PDF document text
    • http://tdsns.ru/userfiles/file/balomapokawoviwazujam.pdfIn PDF document text
    • http://cmtoolsrental.com/user_img/files/bupasegobakiz.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/161258ef09650b---mozinifumajulolug.pdfIn PDF document text
    • http://chiengthai.com/file_media/file_image/file/4904348857.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=planner+ideas+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_off0000bbdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBDB 10272 bytes
SHA-256: 337a83bbac7c06e4b1f9396c0166d6886e8d78c2d9fd62b27c2363f6bbc5327a
font_01_sfnt_off0000d2fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2FD 15784 bytes
SHA-256: 6191f93cbc291cd673be364e5e0d69e8902c79cef1c7aee25d9637924aea1461
font_02_sfnt_off0000fabf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFABF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1