Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea37cf74e5703ac3…

MALICIOUS

PDF

79.9 KB Created: 2021-09-06 01:23:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 51d40f20de7e3873476278053dfb5550 SHA-1: b100cadbefb922e551310888fc3e256de7d69f64 SHA-256: ea37cf74e5703ac37d57aa30e4f92d9d9af6f9a8dac38f8de539144890394af3
156 Risk Score

Malware Insights

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

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, containing numerous URLs pointing to potentially compromised websites or disposable hosting, likely intended to lure users into downloading further malware or engaging in phishing activities. The presence of multiple external URIs and link farm heuristics strongly suggests this is a distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 https://laborke.ru/uplcv?utm_term=instruction+manual+template+free+download PDF link annotation
    • http://akkoryazilim.com/userfiles/file/lowotewawuzuvimurudos.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/mesonufarojijofepela.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/12950721391.pdfIn PDF document text
    • https://nguyenhungstone.com/uploads/image/files/gokewovikojeguku.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/4525272c9154cec841a71e2bd633ee73/2740509152.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/u4s5c7kfhm5trbsr18kkc48jh0/danadana.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082fd431943d---96046834529.pdfIn PDF document text
    • https://juhaszautovill.hu/userfiles/file/22346410183.pdfIn PDF document text
    • https://vieclamday.com/userfiles/file/fikukupefazi.pdfIn PDF document text
    • https://hgb.se/filer/file/kageketusonexaxupizumid.pdfIn PDF document text
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/8256c243778f38fb07c4601d0c8eda2a/bolumivupepiluxivopod.pdfIn PDF document text
    • https://madhubanindiancuisine.com/nbloom/fckuploads/file/10992491123.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/nesasuvurulupaz.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607cef8b876d7---rulapojurudixara.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/v0s88cmfvmdo51oefgim706p4h/bipuwexajige.pdfIn PDF document text
    • https://novahealthclinic.ca/userfiles/file/faviruxixikibizejir.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/16091785ac0950---xulexupuxenisufonuxonan.pdfIn PDF document text
    • http://oroblupiscine.it/userfiles/files/nupowibutole.pdfIn PDF document text
    • https://gotoko.com/cmsv2/upload/files/vipepezujiwokafaxizinef.pdfIn PDF document text
    • https://yomadesign.com/userfiles/Proj_Name//files/wetesuxa.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160f6734d56fcb---linegoniwidunasigaw.pdfIn PDF document text
    • https://universal4shipping.net/userfiles/file/29167319128.pdfIn PDF document text
    • http://korea-labels.com/ckfinder/userfiles/files/wijetavitogekuxebanu.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_off0000d182.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD182 18000 bytes
SHA-256: 73dcdc9d029773fe6180c832c2974a9a33e9e5801841a24d599d36b3567db3f4
font_01_sfnt_off0001009e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1009E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000118b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118B5 10916 bytes
SHA-256: 6621f516be1e910d7ae561d5610ef86079284de6d3b925cb1c9514b62dfef5b3

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