Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3dfbcc49a4f33bb…

MALICIOUS

PDF

77.1 KB Created: 2021-09-12 19:07:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f5bf0c9357dafa27ffd39c363491b7f3 SHA-1: 36471ecc269becedce30d75e17150de090443042 SHA-256: f3dfbcc49a4f33bb258b678bbefa2f7a84f89b40bc321cdf8837234782832fde
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to various PDF files hosted on compromised or disposable domains, indicating a potential distribution or phishing campaign. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were directly extracted, the structure and URL patterns are consistent with malware delivery or phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://hydrem.ru/images/file/75343596772.pdf In PDF document text
    • http://aristosaigonhotel.com/uploads/files/93809075143.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.fr/userfiles/file/suditeges.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/58283519762.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/08b245a30ef8bddb27e0cb44ecbcb439/zozosonikunafejebojofiju.pdfIn PDF document text
    • https://gitteszoneklinik.dk/ckfinder/userfiles/files/xajefosavejar.pdfIn PDF document text
    • http://www.enredmail.com/templates/files/idCliente_/file/mekipirubibuwemoleral.pdfIn PDF document text
    • http://archiw.bibliotekalesmierz.eu/img/upload/files/mazerideselakarozuwupe.pdfIn PDF document text
    • https://emilline.dk/ckfinder/userfiles/files/43214691235.pdfIn PDF document text
    • http://01host.ru/userfiles/files/xirorudol.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/d487b5168fb905bf949769b52cd1b703/15260888090.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131c71b17506---veteloget.pdfIn PDF document text
    • http://benhvienlaptop.biz/userfiles/file/23173065940.pdfIn PDF document text
    • http://zajazd-broadway.pl/galeria/file/41847778961.pdfIn PDF document text
    • http://floramarble.com/uploads/jilebuvujekotetuwajitixa.pdfIn PDF document text
    • https://fishboat.hr/files/kufadosademufemipukuxose.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/qjnmqbietomt15c1recl93ju4i/83572793447.pdfIn PDF document text
    • https://ms2oke.com/contents/files/zorikutavewatewurad.pdfIn PDF document text
    • http://angel-conference.org/upload_fck/file/2021-9-4/20210904022010265218.pdfIn PDF document text
    • https://skywaytravelandholidays.com/ckfinder/userfiles/files/suxusapedep.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/161315c9dcd88d---52164273491.pdfIn PDF document text
    • https://magicdiscoradio.com/userfiles/file/sujurafipes.pdfIn PDF document text
    • https://nurea.se/currency/userfiles/file/8563788888.pdfIn PDF document text
    • https://gtijsr.com/userfiles/file/xasakatirifusomolezetig.pdfIn PDF document text
    • http://www.dr.schure.net/ckfinder/userfiles/files/58188786388.pdfIn PDF document text
    • https://pisangmanis.com/contents/files/serureratezeweza.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=igloo+tamil+movie+downloadPDF 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_off0000cb7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB7E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e390.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE390 17036 bytes
SHA-256: a5609fcb091ba1a2684570df93d06b6f52d98239abbfff6cec5953eb93fd75dd
font_02_sfnt_off00010f7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F7D 10424 bytes
SHA-256: bd176a973128a9cb3b3f4bd2faf48384f289e053735f28fd732ce3971793f427

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