Malicious PDF — malware analysis report

Static analysis result for SHA-256 a945b33e3dcffcce…

MALICIOUS

PDF

179.0 KB Created: 2021-09-04 07:27:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2646bb19251a6226dc0a5b6e58b331a8 SHA-1: 03021ba1fc9a47632276f55af5a8ad24d7160cad SHA-256: a945b33e3dcffccea52302d842c00b5eadee04d94ad9d59a6e5e861de218a740
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to compromised CMS uploads and disposable hosting, a common tactic for distributing malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure suggests it's part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://minhledtran.com/luutru/files/40131725905.pdf In PDF document text
    • https://careersourcechipola.com/files/public/biluxituv.pdfIn PDF document text
    • https://jagominum.com/contents//files/99785804692.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f647f57675e---tajap.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/bc7890761715ca4af57d440814788cd3/wixiponanomoripix.pdfIn PDF document text
    • http://tochalco.com/uploads/files/44835520380.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/16088623cc304c---87517604316.pdfIn PDF document text
    • http://inventory-acepipe.com/images/uploads/files/58084801176.pdfIn PDF document text
    • http://www.smartusb.info/images/library/File/sofebifilasafulevu.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/d8a82cd9b7f42ade95a03dc8f7a5e805/5573596854.pdfIn PDF document text
    • http://dentalweek.eu/userfiles/files/gidafitifirogasimebuta.pdfIn PDF document text
    • http://ty-universe.com/image/files/20210623_201332.pdfIn PDF document text
    • http://montpellier-businessplan.com/mbp/upload/images/images/upload/ckfinder/28636310280.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/b657d65cc209d20637f54ec7d4ad5cea/jiwotubuzadi.pdfIn PDF document text
    • https://fortworthdental.net/cmsCart/upload/file/muvitovugoxil.pdfIn PDF document text
    • https://jurad.eu/files/file/ziwemovupiluzirel.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d643a62ab75---pukivekedar.pdfIn PDF document text
    • http://casier-a-bouteilles.com/file/75632099643.pdfIn PDF document text
    • https://parokisantolukas.org/Uploads/userfiles/files/rusedaxobovelolenavifile.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/16113c11fce921---17611351283.pdfIn PDF document text
    • https://www.espaciocultivarte.com/ckfinder/userfiles/files/pixuvoxavawa.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b59211c67ef---18399020718.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087d8f42db52---butiximoxewilidezodalub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=mastering+windows+server+2019+pdf+free+downloadPDF 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_off00025b16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x25B16 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00027328.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x27328 18540 bytes
SHA-256: 8d681e03eafc3b7b857836248469383f71b6087c843a2359ee04e82de4d1421b
font_02_sfnt_off0002a343.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2A343 11280 bytes
SHA-256: f691c83349b25bfbca998a205c6825459fdf7745d22a1eab26a93ee0294bb9f3

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