Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5420ef8ae16d624…

MALICIOUS

PDF

98.0 KB Created: 2021-07-06 07:42:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 3b09cd68bb3bf9f09c7e4f8355e9e644 SHA-1: fe3241ed4421f58e1339fb84320a105482501b5b SHA-256: e5420ef8ae16d62447d1b87448eb74c62ba8c276555933b0ac72b7d80853da25
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other domains, likely intended to redirect users to malicious content. The presence of multiple compromised CMS upload links suggests a coordinated effort to distribute malware or phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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 https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/sujnqqsrmaerhp1qgvjemgfgnd/37219828009.pdf In PDF document text
    • http://joyear.com/ckfinder/userfiles/files/23948408779.pdfIn PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/dfc94e41d4c7ab13a4534669c78b09ee/57032719926.pdfIn PDF document text
    • http://greenworx.eu/images/uploads/files/rugivirufop.pdfIn PDF document text
    • https://paymentor.nl/uploads//file/denefaw.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/59193e5f55ca00050351f8986f99ed84/74230093336.pdfIn PDF document text
    • http://tokyosushilohaus.com/uploads/files/runikizaxexafezezovovu.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/16094d9e63aa3b---gegufutilupatenogix.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608c5f6362ad4---22918830830.pdfIn PDF document text
    • http://rolmech-strzelno.pl/Upload/file/91330369813.pdfIn PDF document text
    • http://collegium-connect.nl/ckupload/files/garazafomax.pdfIn PDF document text
    • https://unosms.us/userfiles/file/49573559950.pdfIn PDF document text
    • http://lovelyspa.net/ckfinder/userfiles/files/sokikugibaxifovajisowa.pdfIn PDF document text
    • https://triosms.com/userfiles/file/zupowenotiwasokot.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/vilegegi.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/e497733757eaa28491392ed45fa40d47/51192362648.pdfIn PDF document text
    • http://alkanboya.com/files/file///93927171955.pdfIn PDF document text
    • https://cplastik.com/data/cms/file/rojuzegozaxuruzarumuduva.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd0aa0cb80---nasowuf.pdfIn PDF document text
    • https://associazionedynamica.it/uploads/file/17679063197.pdfIn PDF document text
    • https://creativitagh.com/pevron/www/img/file/46987022076.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc9d5b1ad5---lezadipefukeguweworinitol.pdfIn PDF document text
    • https://hocngoaingu123.com/upload/files/depotelonupujejilugupabuj.pdfIn PDF document text
    • http://ownlines.com/upfiles/file/talejofew.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=breakfast+smoothie+recipes+for+weight+lossPDF 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_off000116f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116F3 18108 bytes
SHA-256: 5cb3dbfa435de5c4540e612bef5015545ec062c2ee54afe42e7abe4a6e96ef06
font_01_sfnt_off000146a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146A4 11052 bytes
SHA-256: 74c68a8a40f8093a94266e6df99974245aeaa291b19e0b1fab3be532b972d002
font_02_sfnt_off00016084.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16084 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1