Malicious PDF — malware analysis report

Static analysis result for SHA-256 b435357a2392f3fc…

MALICIOUS

PDF

83.0 KB Created: 2021-09-16 09:38:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 92c785e0c21b319687dee617c1d041ab SHA-1: fd489da90b0e312ede6a647cd8772ddf97b99b3e SHA-256: b435357a2392f3fcfed719633d6f78954844a4569868bfa3356d4a80892a4c6e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains a link farm pointing to compromised CMS upload storage and disposable hosting, suggesting an attempt to distribute malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution lure, likely using a spearphishing attachment as the initial access vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142e1e0c38d3---jakivipex.pdf In PDF document text
    • http://standardamulet.com/files/files/valofuxexegoxibitofaso.pdfIn PDF document text
    • http://sbs-group.co/userfiles/files/sopijaligumetirujorepan.pdfIn PDF document text
    • http://immobilieninvestors.org/userfiles/file/76719021528.pdfIn PDF document text
    • http://www.greenfield-sustainability.com/images/files/20933438653.pdfIn PDF document text
    • http://younewstoday.com/task/userimages/file/vamusagomijodedixaro.pdfIn PDF document text
    • http://crabandclaw.com/uploads/files/95756760805.pdfIn PDF document text
    • https://illustrations.noche.fr/images/files/nagolasofevimujapegamipar.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/36b11686ab4c541141ef5725870b4463/zevesadoxeburevuf.pdfIn PDF document text
    • http://talesma.com/E/file/37472432010.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/161306bb503147---46637527262.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/u52875d0p9n0fi45le2opi5957/jedugaxipisedoxatalidigu.pdfIn PDF document text
    • http://romovi.net/sgi_userfiles/userfiles/files/86921267741.pdfIn PDF document text
    • http://poslovniimenik.net/firme_data/files/99136024729.pdfIn PDF document text
    • http://traktor-tv.de/sites/default/files/file/1756276964.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/16131c8d73605c---wewafa.pdfIn PDF document text
    • https://hinodecoder.com/userfiles/file/89991970579.pdfIn PDF document text
    • https://jck.ro/userfiles/file/8098951436.pdfIn PDF document text
    • http://lezeckastenakosice.sk/upload/files/55969924764.pdfIn PDF document text
    • https://kalimati.in/userfiles/file/wemezarijukepowufu.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16141c0efe1e9a---tedumibefudofopip.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/sqmi6khhv42h4a18d6sabms1qm/jamuwabisadupi.pdfIn PDF document text
    • http://sushibelovo.ru/files/91983065091.pdfIn PDF document text
    • http://auswallendorf.de/userfiles/file/gesavisoxumiwonokavoxu.pdfIn PDF document text
    • https://dp-silver.com/userfiles/file/bagazalatozozuwojujileki.pdfIn PDF document text
    • http://agama-rc.com/upload/files/37929845690.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=download+win+7+iso+file+64+bitPDF 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_off0000db8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB8B 10772 bytes
SHA-256: 70415da607a89c371baa69ace82cb45a08ac124d65626976d103538d3a97f053
font_01_sfnt_off0000f49f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF49F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010cb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CB1 19200 bytes
SHA-256: 637285399212b995544a7673d3e2a67921ed800ea9a6c0233156c1f847665a49

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