Malicious PDF — malware analysis report

Static analysis result for SHA-256 70e25335de7e247a…

MALICIOUS

PDF

69.4 KB Created: 2021-09-01 17:29:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2bd868c5ecbca544c65a9ba38ac1616b SHA-1: d1785ee3adc74bc6eb42fb257a9bd5daff768bdc SHA-256: 70e25335de7e247a39276acfc3e9617779b930776b923e70972e3582e092f054
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links.

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://argyleliquidations.com/userfiles/files/xejunalitarosakofupa.pdf In PDF document text
    • https://samoinstitute.mn/uploads/assets/file/17705165494.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c547f3eef4---rixabopidodu.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/160da9264063b5---96024010523.pdfIn PDF document text
    • http://studioagm.it/userfiles/files/rurefasegaj.pdfIn PDF document text
    • https://path.mn/userfiles/files/juzafufavijukigawib.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160727fb2426a4---75122805729.pdfIn PDF document text
    • https://aspaeng.com/files/image/files/85126779809.pdfIn PDF document text
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/19bf3ohg42ib9u511abgmc4c4m/ranikijot.pdfIn PDF document text
    • https://fizjolech.pl/userfiles/file/zizam.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be7cc9b6e9c---2778258910.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092581875d5e---tetewimerimovisexenano.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9ad6b40f79---98990584470.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/afef03de69050ab6b82def96373b8e15/93533295946.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/16077df2453b9e---59774938285.pdfIn PDF document text
    • http://worldnaturalfood.com/image/upload/File/ruzuv.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/c54ebacf396871caaa28a8656aefef2c/70671380927.pdfIn PDF document text
    • https://hotnews.md/upload/userfiles/files/nujukubisevoxagerume.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c6e7a280927---98739270232.pdfIn PDF document text
    • http://hoteldazegliotorino.com/userfiles/files/67030222023.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1610608d92332b---zipimo.pdfIn PDF document text
    • https://stancijanegrin.com/UserFiles/files/12238579532.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=use+inclined+in+a+sentencePDF 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_off0000b587.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB587 14384 bytes
SHA-256: 264b6cc0da100c06da274ff0175897d44765e8f083ae52d7a7c5549a4bed2242
font_01_sfnt_off0000d935.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD935 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f14c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF14C 10152 bytes
SHA-256: 35a55f0bcc5499737c037f81de5db91e641cc3d57218bb5b23d1acc47b5938ea

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