Malicious PDF — malware analysis report

Static analysis result for SHA-256 c37f1f43be9fe951…

MALICIOUS

PDF

76.5 KB Created: 2021-06-29 20:02:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d963eb98dcac6df3949092b9b56a4ede SHA-1: 8face09f6dc06d52ff2c9a2516de45a9c1f2dada SHA-256: c37f1f43be9fe951e0668b86c74234505e1c8900730ff38e8485d1104502522a
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress upload directories and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is unreadable, but the heuristics and URLs clearly indicate a pattern of directing users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/99cjt9ag324vvt1g76f3bbt833/94564652739.pdf
    • http://candientushinko.com/images/file/58730453824.pdf
    • https://hmanagement.net/userfiles/file/72850886193.pdf
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/d62e141ca5094b6e5c959b518c0b1445/berafafisimidejujojegos.pdf
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/hhu6h3cl2cuopgsc0naei3j0s5/19795570750.pdf
    • http://remont-elektro.eu/archiv/file/parosuvejemoruwo.pdf
    • https://capecoralliving.com/media/file/83310260624.pdf
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608ecec735b3a---51183260520.pdf
    • http://sztarmedia.hu/_user/file/sukegide.pdf
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5cba731ebe---10916845993.pdf
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608a254cb7e42---kibodafirabanomotavuxalu.pdf
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c8cb9b7a895---92464130645.pdf
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/16071a7f37cbeb---tebexujifupanaxup.pdf
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/860001879ffc894d9a7d7069ed132e69/39396866219.pdf
    • http://btc-ltd.com/upload/file/rujisatuvu.pdf
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/82c4c2ed50e6be44aecdd9465ba17d51/32526452133.pdf
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/cc854rh6sibbbaf59m0avnm4g6/jinewabokul.pdf
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afbbd9933fe---betokumofejo.pdf
    • http://theofficefurniturestore.com/ckfinder/userfiles/files/86455888168.pdf
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/bsmptmdfkvip063dotalf1ou0l/durubepelenasogujilije.pdf
    • http://baigeleather.com/userfiles/file/66278377055.pdf
    • https://alexandrapanayotou.com/web/images/static/file/popiwexatalidum.pdf
    • https://parfumzone.ro/files/file/77391847360.pdf
    • http://andreaslasnik.com/data/files/wibaselar.pdf
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607cd108e44e5---57330531073.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=prachi+excellence+in+mathematics+class+8+solutions+pdf+free+download
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c519.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC519 16792 bytes
font_01_sfnt_off0000dd2b.bin
59b3be9a629b898f17ca99d6bba30337ca1002245d05d91ad9fb5246950c043c
pdf-font-stream PDF embedded font (sfnt) at offset 0xDD2B 16280 bytes
font_02_sfnt_off00010764.bin
1a69ac43c69f15133386234c44408515fd56ea9e7db34a464f9022fb2619b592
pdf-font-stream PDF embedded font (sfnt) at offset 0x10764 11384 bytes