Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c89b7052722fb50…

MALICIOUS

PDF

81.3 KB Created: 2021-09-03 23:54:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 388218d474fd907cd72410317a6ca1ed SHA-1: f149323181f7359c07042080a8e7d3a413b2d74d SHA-256: 7c89b7052722fb50d79ead2f76ba95baa7862cff696f6bee42394781f11273b2
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with numerous URLs hosted on potentially compromised or disposable domains. The document body is unreadable, but the presence of multiple external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest the document's purpose is to redirect users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://dentalclinicbangalore.com/uploads/79481995327.pdf In PDF document text
    • http://ikhmongol.mn/ckfinder/userfiles/files/kefekufagevufivuju.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/7cb1f71268ec20323da2cdc447a83dcc/xobulifomuvavib.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608994bd2a2d8---79074266523.pdfIn PDF document text
    • http://partnercable.hu/files/neforo.pdfIn PDF document text
    • https://rusepress.com/uploads/wysiwyg/files/2495963231.pdfIn PDF document text
    • https://foundryindia.org/userfiles/file/4623153971.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608c8b5d58376---62850805639.pdfIn PDF document text
    • http://rld-carbon.ru/file/kivazuzetekaveduzabaxuvug.pdfIn PDF document text
    • http://asbu.net/uploads/FCK_files/file/23225130677.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/160beb62755ed8---kuvagerin.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607871220358a---pasonifun.pdfIn PDF document text
    • http://balassalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bifuforugubunagokezi.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/m1poce4k7upv7fftr2rhafvqul/kokufojan.pdfIn PDF document text
    • https://gionggiacam.com/ckfinder/userfiles/files/wemawaxinunifubimugomez.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160782774a0e39---lulolo.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b3e100350c9---pimes.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/160b035260028b---83446064569.pdfIn PDF document text
    • https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/pqfm93652sip7qi0n4k4q9a1b0/48497548204.pdfIn PDF document text
    • http://pk.mo/userfiles/file/vekekixubiwegemupak.pdfIn PDF document text
    • http://workcoop.org/fckeditor/userimages/file/20210612201424.pdfIn PDF document text
    • https://aashianarealty.com/file/fejagetumud.pdfIn PDF document text
    • http://web68s.com/upload/files/jaxumopakegofusegaludal.pdfIn PDF document text
    • http://st-communications.com/ckfinder/userfiles/files/tizibaverewanizupo.pdfIn PDF document text
    • http://www.biotanika.pl/upload/file/25689009686.pdfIn PDF document text
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/437489233010b5a813bea551ad3234a3/95569341908.pdfIn PDF document text
    • http://archerelectricsupply.com/userfiles/file/68161328218.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=test+print+warna+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_off0000ced6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCED6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e6ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6ED 10376 bytes
SHA-256: 5807952eaef2cd6d4f24fdd8f0c8c4988ca04797b4c87f2e737829fb2ace9526
font_02_sfnt_off0000fe8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE8E 21744 bytes
SHA-256: 32b40392b05fbe200951a93863d8ff1cc12e7f021f36c6278ce09bf1b8887386

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