Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b68a38fbc71765b…

MALICIOUS

PDF

75.6 KB Created: 2021-09-02 08:10:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: f7b67ba6b17c1bd98ce16b827524cd50 SHA-1: 259a16c4f75c6192d4bded14995050b8fae35add SHA-256: 9b68a38fbc71765bafe43dafdd0b9a4a85bba1f2ac3c669a0d7c5f3d203109cd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to compromised websites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The file likely serves as a lure to direct users to these compromised hosts, potentially for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://musorcentrum.hu/files/article/file/rovedowi.pdf In PDF document text
    • http://tiszaladany.hu/upload/file/6689504202.pdfIn PDF document text
    • http://pytextiles.com/userfiles/file/27034086947.pdfIn PDF document text
    • http://orikon.net/Images_upload/files/32889945725.pdfIn PDF document text
    • http://wowbond.com/upload/Fckeditor/file/68538420037.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b42ad5194cf---58531434534.pdfIn PDF document text
    • https://democv.associasuite.com/imagenes/contenidos/files/leponur.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/7d57f6be8598eb8eeb04a4acd2490362/sojugifofezov.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/c6052f35b5a6180688d278d04b5bb7a5/zemepa.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c18b339e49---xujametesotesapiminosas.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608e42e252ff1---33733289293.pdfIn PDF document text
    • https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/f4b3a1a349d773e91ac4e8a469684bf2/45637373473.pdfIn PDF document text
    • https://hssanesteban.cl/files/joluvisijedi.pdfIn PDF document text
    • https://upchealth.net/wp-content/plugins/super-forms/uploads/php/files/0f088305c6fd7fa07c10aa8a8aa5838a/janiwedisavijabipajirub.pdfIn PDF document text
    • https://vvpta-irvine.org/userfiles/file/93650077976.pdfIn PDF document text
    • http://coinproject.com/userfiles/image/file/ledapiropetojiv.pdfIn PDF document text
    • http://flemisterbauldingfamily.com/clients/8/82/82a21d9598fc66f9117a8fb7222c8fd0/File/lodufefogi.pdfIn PDF document text
    • https://alianzatours.com/imagenes/file/85663454802.pdfIn PDF document text
    • http://tcihk.com/userfiles/35454818086.pdfIn PDF document text
    • http://dezmaster.com/userfiles/file/wovirafox.pdfIn PDF document text
    • https://www.drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c6be09ee91a---lojeresanubava.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/47243efe5117ef5ae87c4f157fdc7be4/wosopubegatulaze.pdfIn PDF document text
    • https://shoppingplanet.ro/ckfinder/userfiles/files/90289560632.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079881c9d9c1---wufanidepozaxulo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=from+pdf+to+dwg+onlinePDF 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_off0000c5ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5FF 10576 bytes
SHA-256: fe147f4b780223d2d44824602b997368b4c8b0500f6024476836ec3c5a3d2706
font_01_sfnt_off0000dddd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDDD 16396 bytes
SHA-256: c0b27e5be85769d7e18841477956b52c49edb80370170102c9c8c43f69113f9f
font_02_sfnt_off0001082c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1082C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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