Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c2f3f80403e5e43…

MALICIOUS

PDF

77.2 KB Created: 2021-09-05 03:28:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 06019a78a09436f88be5003b6b8013bb SHA-1: a343b8450ef95e053604141656b237d4d55ed88c SHA-256: 4c2f3f80403e5e43f991d61d7cd7f60d7f1efb833ca561f4cb9595925fc5ef8a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. No scripts were extracted, but the PDF structure and link farm heuristics point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/7eab845d5203a0f3911753a230aa855d/66632966469.pdf In PDF document text
    • http://jkohut.pl/file/83977825312.pdfIn PDF document text
    • https://malashealthcare.com/userfiles/files/kopasorotimutosu.pdfIn PDF document text
    • http://winfielddeli.com/ckfinder/userfiles/files/31628485140.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c1e4ef618de---62364517043.pdfIn PDF document text
    • http://swaving-stalinrichting.nl/ckfinder/userfiles/files/xekonagodawekarozireduz.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f1076f83b97---dawalapumilekozaj.pdfIn PDF document text
    • http://macabrey-luthier.fr/data/Files/66544619164.pdfIn PDF document text
    • https://subarini.ro/mm/file/74141580316.pdfIn PDF document text
    • https://alarrabnews.com/images/content/content/file/28169635519.pdfIn PDF document text
    • https://amerismithenterprises.com/wp-content/plugins/super-forms/uploads/php/files/859bd710f38ff5fe8b39e6f70ea3c086/fujifodifunipakizif.pdfIn PDF document text
    • http://sangtaoad.com/uploads/userfiles/file/53223624926.pdfIn PDF document text
    • http://yksskj.com/ckfinder/userfiles/files/rogaxizix.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6013e24c47---tojivemanatebilufovuvaxu.pdfIn PDF document text
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a90734ef1e5---57967302679.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1c8d038df---77659697557.pdfIn PDF document text
    • http://enjoy.sk/editor_uploads/system/files/vobukunawejifubofamipemog.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//59454327567.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/22716958b4b1b4a4ebb96b2515363610/62128544891.pdfIn PDF document text
    • https://digicpictures.com/downloads/fexezixikevev.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160e97102b995a---nonekiligir.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/394ec625d0cbd4277d036ea555ece5fa/30733988027.pdfIn PDF document text
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/90be0b4843000c81a7b3b9f4da4837b0/13147200694.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=chess+rules+pdf+in+gujaratiPDF 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_off0000cb68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB68 16772 bytes
SHA-256: f137f331915700c4a195eb773e5a9b88c42f58142d4db9e071506d503a60e067
font_01_sfnt_off0000f65f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF65F 10920 bytes
SHA-256: d4f2e84124e8aaf25fc3b42a746b8b4336e81cbee5f4ec891f4130704de5fd9d
font_02_sfnt_off00010f5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F5E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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