Malicious PDF — malware analysis report

Static analysis result for SHA-256 4558b777e4242700…

MALICIOUS

PDF

101.8 KB Created: 2021-08-06 08:46:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6ab72e927b6d5c6c271d566043562196 SHA-1: 1d44559a40864cd4e26d87577306bf08a5a80286 SHA-256: 4558b777e42427000f81397dadd37a44c50f5a7b33a4ff1f626903b52fabafd8
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, presenting numerous URLs that point to potentially compromised WordPress upload storage and other disposable hosting sites. The primary goal appears to be directing users to external malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9868

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 http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/26kqrcofaduph1f4rtunbrrsa6/41850539916.pdf In PDF document text
    • http://reikihaus.com/clients/75291/File/37914262380.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/96549041512.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/9e5f6fad37aa4662d4eb2372bf79fef8/92474374784.pdfIn PDF document text
    • http://zlato-invest.cz/upload/files/53883919461.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/1d6c8b73357e766bd0ce497061f1cf47/pegizikaboziwusawa.pdfIn PDF document text
    • http://elitvorota.ru/f/file/zulotuwure.pdfIn PDF document text
    • http://fsgpj.com/upfolder/e/files/20210617155453.pdfIn PDF document text
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/e8d5e24b0c4b8d7890202383f6c8f4b5/rejofawokesigadif.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/36207770905.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/2mhrn0vvr4ebv2j20m7vdi740e/buwaxetubezadumesajimema.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/3b7f152b9ae39e166c98ea20bb545594/97479558854.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b8a5d543515---zitokelaxisizusexinuw.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/7a16cdad55c7425d69b87172de1a45b4/77043117960.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8233e1860---sesirijazuloforeda.pdfIn PDF document text
    • http://stroisvias.ru/userfiles/file/2727729810.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/160887b7a6913c---xilekarizigekej.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160804482551a5---31444912711.pdfIn PDF document text
    • https://lastcallslc.com/wp-content/plugins/super-forms/uploads/php/files/ba084553a0ad305deadbde15cdda8620/80011879327.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608d312f607a3---46724863587.pdfIn PDF document text
    • http://www.radiooro.com.mx/media/images/uploads/files/kolinesiruzuni.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/tgp9n226dcv6uepr6aqmkpprn6/95050559607.pdfIn PDF document text
    • https://observatoire-omic.org/documents/file/97462994003.pdfIn PDF document text
    • http://www.look4job.gr/images/_user_na/file/45095104323.pdfIn PDF document text
    • http://kaies.cn/upfiles/file/41842538286.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/evql432d71u7f5jibsdjt3gp71/94871942485.pdfIn PDF document text
    • http://apvn.info/userfiles/file/90318375782.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=mcgraw+hill+connect+business+math+answersPDF 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_off00012919.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12919 17408 bytes
SHA-256: 4702c8e082cacf14fdf25457596d71899bbc7e9891e0ea2d8eff540c5b5621be
font_01_sfnt_off00015688.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15688 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016e9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16E9F 10996 bytes
SHA-256: 96a16de7fd5e5afd44978f448e1e42a758bf2935ef3f2507a92aac7908300e25

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