Malicious PDF — malware analysis report

Static analysis result for SHA-256 155a432389f5dc1a…

MALICIOUS

PDF

80.6 KB Created: 2021-09-14 13:06:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: df4660e9d04286ca72767f98c3d44a40 SHA-1: 996711b140c2e1f5b7bbd92077a659e4f5177413 SHA-256: 155a432389f5dc1ad65a4255e91bda6c66de9d5e3911690b77eafcc943584ac0
164 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 phishing or trojan-like behavior. It contains a link farm pointing to various PDF files hosted on potentially compromised or disposable domains, suggesting an attempt to distribute malicious content or redirect users to phishing sites. The presence of multiple external URIs and a link farm heuristic strongly suggests a phishing or content distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://orgue-chantepie.info/FCKeditor/upload/file/ludejizenipotit.pdf In PDF document text
    • https://dichvumayphoto.vn/webroot/img/files/titipezubujini.pdfIn PDF document text
    • https://highlander-inn.com/assets/userfiles/files/19085516154.pdfIn PDF document text
    • http://haiphongcontest.com/images/files/disezigifuvutuxinopururi.pdfIn PDF document text
    • http://hongphuc.vn/userfiles/file/24072252535.pdfIn PDF document text
    • https://mlbcsimleague.com/ckfinder/userfiles/files/85549859463.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/161345c8cc8a6a---60667969548.pdfIn PDF document text
    • http://medeeatour.ro/mm/file/zipasisumaludod.pdfIn PDF document text
    • http://eco-versute.com/app/webroot/ckfinder/userfiles/files/nimoxibapamikifavoju.pdfIn PDF document text
    • https://bocrangsuthammy.vn/upload/files/6509481723.pdfIn PDF document text
    • https://samuelben-horin.com/userfiles/file/xexir.pdfIn PDF document text
    • http://nj-rshb.com/v15/Upload/file/2021913115097736.pdfIn PDF document text
    • https://fengshan-zhennangong.org/upload/ckfinder/files/76836794323.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/6e8c7a7273983fb891c3b2cc112a2658/kuravurikoraxorog.pdfIn PDF document text
    • http://ambulatorioveterinariorigolon.eu/userfiles/files/midewalijowesilinit.pdfIn PDF document text
    • https://bliznacite.dvsportbg.com/files/35744294197.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612f1571170a0---86862422174.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e3736c90a5---34744602467.pdfIn PDF document text
    • http://lexxyin.net/files/fckeditor/file/domogokemadadizowodeso.pdfIn PDF document text
    • http://www.globalnautique.nl/upload/files/forejubadosogoge.pdfIn PDF document text
    • http://sinojjacob.com/userfiles/file/niluzodoxa.pdfIn PDF document text
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/suletupafatudelerajewaf.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd0738788a---tojirewadukixisinugipu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=vishram+singh+neuroanatomy+pdfPDF 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_off0000d6a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6A4 11080 bytes
SHA-256: 91a149e77787ca1a36cebb647e342ad337df12083f5b9ba616c81e711c073a17
font_01_sfnt_off0000f02b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF02B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001083d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1083D 17244 bytes
SHA-256: 345efbb1c3dd83cafacf4cf1ccd6424e38f6894335620553a5c81ceac92b525b

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