Malicious PDF — malware analysis report

Static analysis result for SHA-256 25d7443576a28a52…

MALICIOUS

PDF

86.4 KB Created: 2021-06-29 10:00:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: e7f204ace5fd304c8c362cba1ec76de1 SHA-1: cea945cb1ecb01efaa5758e56de24aef03eae978 SHA-256: 25d7443576a28a52d7d7161b889f5b01709d0fb4015cf9a85692bc268aeac5c1
156 Risk Score

Malware Insights

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

The 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 other PDF files hosted on various domains, some of which appear to be compromised. The presence of multiple distinct hosts and the use of disposable hosting suggest an attempt to obscure the ultimate destination or to leverage compromised infrastructure for distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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://sixtyguildersresearch.com/admin/photos/file/57096594779.pdf In PDF document text
    • http://kondicionery-krasnogorsk.ru/upload_picture/file/54617916068.pdfIn PDF document text
    • http://446888.top/userfiles/file/37171294624.pdfIn PDF document text
    • http://lookkorea.net/userfiles/file/wagoxa.pdfIn PDF document text
    • http://quick-thailand.com/images/uploads/file/xizoxivuwulenepokog.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/16087057985f82---zujemapirukopasapuzi.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607abfc151858---tukuwok.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609dcaaea5b10---9350287276.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160703fd4ee8ea---32307148042.pdfIn PDF document text
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/ngpgh7qn2s6e57vkttih8k9e10/48206997417.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607ebaac6c461---37067262922.pdfIn PDF document text
    • http://banghaija.com/userfiles/file/92253710558.pdfIn PDF document text
    • http://web68s.com/upload/files/junimujapasodozopuk.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/25c3c8b7d2d518dda223eb84aa64df2e/65713340090.pdfIn PDF document text
    • http://naplesredeals.com/userfiles/files/13470987380.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1608d98de1596a---pedalafabo.pdfIn PDF document text
    • http://morethancars.nl/uploads/edytor/file/pededunagalaje.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5d41844765---fatixo.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/16073c695d0809---16664729311.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aabd1672b5c---65977755089.pdfIn PDF document text
    • https://foxtailmag.net/wp-content/plugins/super-forms/uploads/php/files/e3ed9d3a7f7f1a5231e255330e6bafde/pezazojal.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/96059329975.pdfIn PDF document text
    • https://acornschoolcharleston.org/wp-content/plugins/super-forms/uploads/php/files/9828daa2989308d37be0049cb49191bc/wejus.pdfIn PDF document text
    • https://klairtransport.com/uploads/files/1310772152.pdfIn PDF document text
    • https://triangle-electronics.com/assets/userfiles/file/32473050742.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c72478d7b0b---napob.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=what+two+colors+make+brown+with+crayonsPDF 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_off0000f107.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF107 16152 bytes
SHA-256: f14b01803df9ca1e870b731575a03c8d947575f643dc4c582bc2931f4825a50d
font_01_sfnt_off00011aca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ACA 10920 bytes
SHA-256: 502f8f5c6dc97e960b9afa2eadbd78958031fe7cc5183a939a5be3c836434dc8
font_02_sfnt_off00013401.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13401 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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