Malicious PDF — malware analysis report

Static analysis result for SHA-256 f409589d5caaf48e…

MALICIOUS

PDF

95.9 KB Created: 2021-08-21 00:52:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: b4c82d94a090724075666bb441466897 SHA-1: 187704b3e00d8ec213e8bebd984701fd46a81411 SHA-256: f409589d5caaf48e2febf1a0cecc869e7db86b75c37ba255964e7f26b4534f49
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses an invoice-themed lure. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 7

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://ketchas.ru/uplcv?utm_term=casos+practicos+de+contabilidad+basica+resueltos+pdf PDF link annotation
    • http://maslag.eu/userfiles/file/vubasasogevomopot.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5c505d060---pinefidaxagudude.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/874012da8609c4b233e54d39bc58c7fc/63426092368.pdfIn PDF document text
    • http://kaies.cn/upfiles/21070417113783420845ngs8.pdfIn PDF document text
    • https://maplesservice.com/wp-content/plugins/super-forms/uploads/php/files/8dd7f802c458a6fef060d1766f985aeb/66158518505.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/b1fff7cc44fbca91f4923fa86196f688/18615165411.pdfIn PDF document text
    • https://store-connector.com/_upload_bilder/_filemanager/file/15949259023.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/0bl1pf3g6fsirjkciojhj57fkf/tukawil.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d495b36f0b2---mufobananovitixapibazase.pdfIn PDF document text
    • http://aktifbant.com/resimler/files/36672566159.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160ff48f8aad64---duxiza.pdfIn PDF document text
    • https://khogiaydantuonghanquoc.com/images/news/file/33384861878.pdfIn PDF document text
    • https://www.barrau-philippe-sedeco.fr/ckfinder/userfiles/files/58683878233.pdfIn PDF document text
    • http://fullcolorspandoeken.nl/userfiles/file/54861197965.pdfIn PDF document text
    • https://protechlighting.com/wp-content/plugins/super-forms/uploads/php/files/c73395415568a36730f61c8869f381d7/sapepotepepolesepumi.pdfIn PDF document text
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/10cf3b6ea7587fbe32eacb7a27645e71/29091303978.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608214c200e0b---zifoxasuxotok.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/93fd4076158703acd000769a20a1dc6e/90908276943.pdfIn PDF document text
    • https://artigianoteca.it/file/37985055132.pdfIn PDF document text
    • https://isabellepieman.com/userfiles/file/banifoniwaxivibovapamefa.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16077fd8d2bc28---66507796459.pdfIn PDF document text
    • https://durgabas.coop.np/ckfinder/userfiles/files/sobobovagepuxuzivepop.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ae37a758c25---ponisomeweboruxim.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a401caa7bab---fetetixikimezi.pdfIn PDF document text
    • http://epmresearch.org/userfiles/files/48644753982.pdfIn PDF document text
    • https://johanbjerke.se/userfiles/file/biriposipotuvoragubilu.pdfIn PDF document text
    • 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_off00010ce2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CE2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000124f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124F9 10884 bytes
SHA-256: 04a6e460abce75fdf97539887b03ec617e5e06f0d6d73732a48b7ceeb64e1dd8
font_02_sfnt_off00013e07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E07 19248 bytes
SHA-256: 859b57a2052287707b9dfbe25997566c04c2d2e483be5199e283cd0f7081b933

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