Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca734eb7bde44ded…

MALICIOUS

PDF

83.7 KB Created: 2021-09-04 09:59:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7f4e9524073a23c436414818a949408a SHA-1: 4f6ee089d426c10259fd5620e409c4d59b8bdd7a SHA-256: ca734eb7bde44ded47614f9fc93a3c9f2ad5193cbb09f71e5f3bd3a0a826c94f
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 to potentially malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://rajatotogroup1.com/contents/files/nagiravomi.pdf In PDF document text
    • http://niestachow.pl/data/aktualnosci_imgs/file/dofil.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160a8be1c3bc97---57589633291.pdfIn PDF document text
    • https://economiadecomunion.com/ckfinder/userfiles/files/bipujokufalaz.pdfIn PDF document text
    • https://byocamacho.com/ckfinder/userfiles/files/16246174886.pdfIn PDF document text
    • http://babyshelter.net/assets/upload/files/15460226480.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/wirinij.pdfIn PDF document text
    • http://nuovojob.com/userfiles/files/bafiwuxiwegodutag.pdfIn PDF document text
    • http://hani-bee.com/userfiles/files/lubapogowofezefeso.pdfIn PDF document text
    • http://skogsformedling.se/bilder_umeny/File/pafuzedatawadigujinikaw.pdfIn PDF document text
    • https://bistakalikotenetwork.com/userfiles/file/96770310266.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1610361c02640c---joxinerevafiji.pdfIn PDF document text
    • http://csc0851.com/userfiles/file/20210620133504_6lce64.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16089b4996e1b0---48440254094.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/tuwuripa.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/e453689432be4ddab55fc5d53497ab5f/31888532245.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/58866149512.pdfIn PDF document text
    • http://eastmoorclassof1970.com/clients/4/43/4343e427eb1b0a0668350338a4d6b623/File/49185118591.pdfIn PDF document text
    • https://aglogistics-bo.net/userfiles/file/lazevabetaved.pdfIn PDF document text
    • http://unseenadventure.com/userfiles/file/jaburirubupinumipef.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/96904711463.pdfIn PDF document text
    • https://www.alugutader.fr/ckfinder/userfiles/files/nuvomuwasuvazal.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/snj3qeuckl1n8vijrtbvhn5dqa/29279406484.pdfIn PDF document text
    • http://dienmaythanglong.org/uploads/files/45306290433.pdfIn PDF document text
    • http://fizjoactiv.eu/Upload/file/vededefetavatulivop.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=tesseract+hocr+to+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_off0000e33a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE33A 10440 bytes
SHA-256: d8cc5e659ac8e2325e9815df78e6296a4a6f6b7c15cbe5922db23b14f6ec9150
font_01_sfnt_off0000fb14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB14 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011326.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11326 17592 bytes
SHA-256: 1103df06950b42a61806a8626668520342b98a5dad9d5ecb6b21a70dd1a27c2b

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