Malicious PDF — malware analysis report

Static analysis result for SHA-256 1132b59bb356eb6b…

MALICIOUS

PDF

78.8 KB Created: 2021-09-08 04:01:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a103867889354d3627a5e2f17865b69e SHA-1: 70740b342173c4ca3ad69720867b1cd31c44657f SHA-256: 1132b59bb356eb6b8387e6c9fdbce3e24f320b19f9d0a40a20ff946f872acd80
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains a link farm pointing to numerous URLs, many hosted on compromised CMS platforms or disposable domains, suggesting a phishing or malware distribution campaign. The presence of external URIs and link farms indicates an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://smidgel.ru/uplcv?utm_term=lincoln+electric+welding+machine+pdf PDF link annotation
    • https://bilalyapidekorasyon.com/userfiles/file/bazazalipuwefixisit.pdfIn PDF document text
    • https://abugfreemind.com/userfiles/file/zebopurem.pdfIn PDF document text
    • http://trimblehighalumni.com/clients/84492/File/30063542951.pdfIn PDF document text
    • https://lawyerupsmart.com/tempimg/file/74946455189.pdfIn PDF document text
    • http://dudikom.pl/userfiles/file/18882643410.pdfIn PDF document text
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/aa4c42d1ea55f079ba59b05ad0b96694/xinuratevuxorabog.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/2ac81e982e8306f38afa48abe5e87c7f/25236472126.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607f800c2d90b---1476329328.pdfIn PDF document text
    • http://janatalnajaf.com/basefile/janatalnajafcom/files/31834370231.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/72279278890.pdfIn PDF document text
    • http://biosystech.com/pdsFck/file/xevarofan.pdfIn PDF document text
    • https://mamalight.net/business_school/uploads/file/gemukifapurilumek.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/3a50dc6bb8d32dfb32a2485b594e4e8c/sovutowepekatokunal.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c64601690ca---rusome.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16098259fb39b1---jotusirodagop.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/1beeb5d8630173c4d53673d1ada67ee2/deburekut.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/48f25c5cc78493a5556d60396936cf59/nunewenojo.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161105217b63d6---78185667168.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/16128a855859ed---labedijunuwiworajaj.pdfIn PDF document text
    • http://weifong.tw/fckimages/file/19403408284.pdfIn PDF document text
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/6029c71608989190c3799100d861df69/1789919349.pdfIn PDF document text
    • http://jump360.co/upload/files/20210828191002.pdfIn PDF document text
    • https://geniodelweb.com/file/wesomor.pdfIn PDF document text
    • https://micsys.in/userfiles/file/bigewuxejugabovoto.pdfIn PDF document text
    • http://bagumul.com/file_upload/spaw_upload/file/20210616163155.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16111662f56e2f---55300183249.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_off0000ce1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE1E 17740 bytes
SHA-256: a58a78937641a963dd2d50889c17319a5a23a07f55ff296ce5bc3d0c34680d37
font_01_sfnt_off0000fc8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC8C 10940 bytes
SHA-256: 284b4e3f4f32d6f394cfa60516d9f616b77251a77d7c754c4512053dab0f7a12
font_02_sfnt_off00011581.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11581 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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