Malicious PDF — malware analysis report

Static analysis result for SHA-256 96c99bfdf8b955f5…

MALICIOUS

PDF

70.5 KB Created: 2021-09-28 20:34:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 008e10d29ddd872a3ba073f34f5e175e SHA-1: 95418d9f8bb43517f4930c9f8d31867e8a656bad SHA-256: 96c99bfdf8b955f58d7f2fc478bdb058ce7114f1eeeeb4ae595008d7f582f5c1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the presence of multiple PDF link farm heuristics points to a common tactic for distributing malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://posicert.com/upload_fck/file/2021-9-11/20210911182337106697.pdf In PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/161371b222ff59---gurumavavuradetuvugilo.pdfIn PDF document text
    • http://bigbulkbags.ahmadpackages.com/survey/userfiles/files/moliveme.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16141cfd0b6472---56601326939.pdfIn PDF document text
    • https://strechybenesov.cz/content/48212634145.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f7b79c0d62---dagarokapipenax.pdfIn PDF document text
    • http://roocenter.ru/upload/file/kudemozetuliso.pdfIn PDF document text
    • https://aluvioneschicamocha.sinecsas.com/ckfinder/userfiles/files/24963838214.pdfIn PDF document text
    • http://qdsenfeng.com/data/files/zikep.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613488316a43d---sisunevibageduw.pdfIn PDF document text
    • http://splogservice.ru/content/files/vekokigogadodu.pdfIn PDF document text
    • http://gibkrakow.pl/uploads/files/7569323846.pdfIn PDF document text
    • https://umiyawoodworks.com/fckdb/userfiles/file/duguvezafipipazuwiregajep.pdfIn PDF document text
    • http://interroadholland.nl/userfiles/file/witexejimedunemufo.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149de7481b31---jimudavalawe.pdfIn PDF document text
    • http://prunay-en-yvelines.fr/ckfinder/userfiles/files/87951120500.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/94v4lmlt7c27vs1m5slupae9k3/jigafoxenetulogenewetuwuf.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133940974913---fijebojanotaxanis.pdfIn PDF document text
    • http://indianapit.thriftstorewebsites.net/flash/indianapit.thriftstorewebsites.net/file/tedam.pdfIn PDF document text
    • https://selapro.com.au/application/third_party/ckfinder/userfiles/files/93819405898.pdfIn PDF document text
    • http://dyccpharma.com/upload/files/52152668049.pdfIn PDF document text
    • https://bselink.com/userfiles/file/64704113736.pdfIn PDF document text
    • http://hcwan.com/userfiles/file/85303147404.pdfIn PDF document text
    • https://elemental-ia.com/userfiles/file/84842589872.pdfIn PDF document text
    • http://agriturismolataggiasca.eu/userfiles/files/bubunujetokir.pdfIn PDF document text
    • https://akproauto.net/nbloom/fckuploads/file/69275087811.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=transfer+from+phone+to+phonePDF 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_off0000b36a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB36A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB7C 16632 bytes
SHA-256: 4af92f13b132beadecfd07a615caae35d308c46d041cbbadf1c12e0e0176e8f4
font_02_sfnt_off0000f4d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D5 10448 bytes
SHA-256: b9ee867e7550827d685ee01aab9454fe0a86fac99778234699ebba02ae1edc86

Open this report in the interactive analyzer, or submit your own file for analysis.