Malicious PDF — malware analysis report

Static analysis result for SHA-256 710d86cc1a809cf8…

MALICIOUS

PDF

82.5 KB Created: 2021-06-04 10:35:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 9e5d84ba455122f5e2a09fe555739fc5 SHA-1: 325e1004c6a1eb028b91c8ab9899fae182f7f19a SHA-256: 710d86cc1a809cf867e804f6f87b860b2749aaa57202c3d48cfa0bbeb604700d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF file was flagged as malicious by multiple heuristics and an ML classifier, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains a link farm pointing to compromised WordPress upload storage, suggesting an attempt to redirect users to malicious content or phishing sites. The presence of embedded URIs and the nature of the heuristics indicate a likely spearphishing attachment used to deliver a payload or lead users to exploit kits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160989f7aefc60---10965974017.pdf In PDF document text
    • https://ecobox.eng.br/wp-content/plugins/super-forms/uploads/php/files/42v8oekgedhklnrd4av5f1ilt6/kixoxexu.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609090de576b4---jokegoliw.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a6ad99c4d86---depikijoravas.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/16080bf5f3daf9---wulemubopesiwenuv.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609844b5b429d---lonovuvaxo.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16077f9f6c81d6---towefoxufuzaj.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/8df7b1f30dad13ef160da5a11c10f57a/mazilax.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/160720b50b5648---xofuvapabi.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092205d9bddf---33417876229.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef86ae6d73---19442090609.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609e3a6a3c02a---41048925513.pdfIn PDF document text
    • http://eurogeographyjournal.eu/admin/fckfiles/file/96075782398.pdfIn PDF document text
    • https://bienenaktuell.com/sites/bienenaktuell.com/files/file/21413983376.pdfIn PDF document text
    • http://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/2f1e855d30b6b71b96e6d60c693b8859/33104964841.pdfIn PDF document text
    • https://tavio.ru/files/file/dolon.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=trumpet+ableton+sound+packPDF 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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn 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_off0000d05d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD05D 6588 bytes
SHA-256: 24fd6868f187b5667792517f9f69d22ac5a3de5011d4d3824467392effeade79
font_01_sfnt_off0000e0d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0D7 5372 bytes
SHA-256: b456c7bf91c53b3004f594a6fa5e654903c344362725b26e7d920399773e8107
font_02_sfnt_off0000f2f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2F1 3268 bytes
SHA-256: a4c9ec3938b04b1a0138f61954a241cbe1834c97233bed51c461fb7109542532
font_03_sfnt_off0001003c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1003C 10660 bytes
SHA-256: 715c5d7b6bfd8e36ee48ad3a0f0c7943794b513f49ca32b45105235c72f07c66
font_04_sfnt_off000124c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124C1 16336 bytes
SHA-256: cb8b0c3b75634a3ac40028f3142d2b99dbff9c8bfe93654f62892c2eba89f065

Open this report in the interactive analyzer, or submit your own file for analysis.