Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d833526413ce2e6…

MALICIOUS

PDF

105.7 KB Created: 2021-07-05 00:44:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 5ee346690367039ff1da93ffb9029d68 SHA-1: 50354bfba9ee81028060c02cd37961cabb70dde0 SHA-256: 1d833526413ce2e688d69abbc2ccdd645a25aa9c806181dc2c46ca2688f9223c
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains a large number of links, many pointing to compromised WordPress sites, suggesting it functions as a link farm. These links likely lead to phishing pages or serve as a distribution mechanism for further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9959

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://queure.ru/uplcv?utm_term=attacking+fielding+positions+in+cricket PDF link annotation
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/fmclq9nst9rdg803ntfh3dm1cn/divevuto.pdfIn PDF document text
    • https://electrabicycles.pl/app/webroot/uploads/file/1624364076027.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608df95f4a58a---fokafekeg.pdfIn PDF document text
    • http://wang023spa.com/userfiles/202106file/2021062721270870554.pdfIn PDF document text
    • http://thetownsendfamily.net/clients/a/ab/ab79602242cca8f930cd52af13df1d51/File/8817671915.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/611c2e72fdc1c0396eb4160a8588a92f/96626138676.pdfIn PDF document text
    • http://mg001.cn/upload_fck/file/2021-5-30/20210530032556277018.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/3418b4bdf05479f3285b00baea94d003/gubexeligixuxe.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097c85b29f72---gibazisalozexila.pdfIn PDF document text
    • http://livinglearningandworking.org/clients/e/e0/e05af8355f71d8da3aa90f500b9284b3/File/3885290439.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/pltpl05vgkmrlotign788jp2mc/85198746186.pdfIn PDF document text
    • http://garderoba.sk/images/_file/wuvapazezumivola.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6bda4b2bd---noguxa.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160874e5585989---jolamuki.pdfIn PDF document text
    • https://aplusadvance.com/naver_editor/data/file/dixanapineverad.pdfIn PDF document text
    • https://digireg.it/upload/tabijafidogo.pdfIn PDF document text
    • https://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/os09hdrfkd5afethm1pp6e0v22/damifupi.pdfIn PDF document text
    • http://usmleworkout.com/files/file/pevewefonixakej.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16079049cbb8a6---91487998002.pdfIn PDF document text
    • https://chp-travel.ir/data/file/xawapuwaxasu.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609c62414444d---newifebaji.pdfIn PDF document text
    • http://panziofabian.hu/fck_kepek/22115366498.pdfIn PDF document text
    • https://capital-tic.com/upload/ckfinder_temp/files/20210526181240.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_off00013d72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D72 10868 bytes
SHA-256: a2fc388f4b9b30ff3b87bcefe94e196ac0a0ec378f32a950603ee79fd6d21725
font_01_sfnt_off0001568b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1568B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016e9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16E9D 16564 bytes
SHA-256: 553e4a204cae4c34f314861022637efc6bd09ec9988f5be7a8d0190b606c5354

Open this report in the interactive analyzer, or submit your own file for analysis.