Malicious PDF — malware analysis report

Static analysis result for SHA-256 62c531de60b9d190…

MALICIOUS

PDF

121.2 KB Created: 2021-06-28 05:51:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 5cd6c8ed878fb844d6cf730104a601b6 SHA-1: 689aceaaa36b8ea8026b247dfcfd2d96a631881a SHA-256: 62c531de60b9d190de3be95f93b984ca6e9ed76e21c0eee0675a7b0c327e6c5d
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The document body was unreadable, but the presence of numerous external URLs strongly supports the link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9632

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://amphorabeautyclub.com/campannas/file/gizaletomidogifux.pdf In PDF document text
    • http://kiiga.ru/userfiles/file/gikigoj.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607cf9e386506---7637428161.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/qv90km986lk1bfv05p1mmt23rs/38982710187.pdfIn PDF document text
    • http://smflow.in/admin/uploads/file/najewarojujopewedubananu.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/sikoluduj.pdfIn PDF document text
    • https://regiefranchet.fr/userfiles/files/jirifejofimaxiwuborot.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/dg2c5krt2r4tp6cbblhagkelil/vagabimukomaj.pdfIn PDF document text
    • http://sergey-yushkov.com/pict/file/wetutazulixakolisu.pdfIn PDF document text
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/e03d77fc3599a1ae259b33c10580090b/nitamofojeroxatovufajako.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16080862e06183---balonebikemenur.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607c8099d6aef---kekofozizowapub.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c52b09c279f---gasozos.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/0e442994e224417ad790ad45490cf7b4/ruxapaniwogegubamedob.pdfIn PDF document text
    • http://rcsiprojectracker.com/userfiles/files/tadozenitavodawut.pdfIn PDF document text
    • http://albatrossmrn.com/konadnew/userfiles/file/fedodabi.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d48af70508---zafaruwewunibuxarebuwaxi.pdfIn PDF document text
    • https://boucherienabli.com/uploads/FCK_files/file/63358258806.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/29b533edjs7ig8uei2deo3marm/10609586942.pdfIn PDF document text
    • http://expresskaliski.info/file/17548390627.pdfIn PDF document text
    • http://nail-free.com/ckfinder/userfiles/files/8492614591.pdfIn PDF document text
    • https://assignmentmart.com/ckfinder/userfiles/files/15150929101.pdfIn PDF document text
    • https://towa-aaa.jp/userfiles/file/87391544589.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097849ea0e0b---mefabarumezol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=bureaucracy+meaning+in+bengaliPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015229.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15229 20340 bytes
SHA-256: b2bacaa2ff48f64833ef31d8bf5b7743cb1a1020c13179c0ebaf6cbb83b081a8
font_01_sfnt_off0001853b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1853B 16724 bytes
SHA-256: 435f6340d4d7d64fa00f1533868fc36bfc944ed909c77a0f08c8c80bb9364a2e
font_02_sfnt_off00019d17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19D17 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001b52e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B52E 10592 bytes
SHA-256: 6c3889839db39980796a57a695055f5bc9f02cba564d8b683ce06889ee43d478
font_04_sfnt_off0001cd54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CD54 2016 bytes
SHA-256: aa2653fa0171331110f10d67010af59a4ab25cf9ed9be254118a47c0d49ff3ad

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