Malicious PDF — malware analysis report

Static analysis result for SHA-256 66bb40f8f825a7f2…

MALICIOUS

PDF

75.3 KB Created: 2021-08-22 01:02:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ac69696f676c76eb9dbf353524a15854 SHA-1: c7d6e31bd64df68235fae0b132325a6caac940be SHA-256: 66bb40f8f825a7f28415e51f5295ec3c324186c722b8366a12f524a1853abb67
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. It functions as a link farm, containing numerous embedded URLs that point to compromised websites, likely intended to lure users into phishing scams or download further malware. The presence of multiple links on disposable hosting and the use of UTM term redirectors suggest a coordinated effort to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://frangarcia.eu/upload/file/26776123653.pdf In PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b1f9fcd4010---53436457804.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/814149f168f5de298066e233f7bed9a9/sejex.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9541e710f---tewunosazesomamixigimafaf.pdfIn PDF document text
    • http://dambi.pl/userfiles/file/digotejobefedakewil.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/mazilomugujotafose.pdfIn PDF document text
    • http://toflight.mobi/attachment/ckeditor/files/27a452d9c58b825295858b1d11545c6b.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609882e01760f---nexugepixewokivexo.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/wupexupunokopirajexes.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/16083e02ee302b---moluxixutile.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/8c4150dd4082ec5823de84d6f68b9b73/lajuwivuvapixibanel.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610401e375e26---42167886427.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/7360045556.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b97a552eb5e---77699961261.pdfIn PDF document text
    • http://cesurmakina.com/userfiles/file/16928007268.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/fe77355ece7aeb858e3420574363e254/71890266785.pdfIn PDF document text
    • http://farmaciafici.com/userfiles/files/16024871382.pdfIn PDF document text
    • http://paoladebenedetti.eu/userfiles/files/14682351007.pdfIn PDF document text
    • http://chixue.com/uploadfile/file/20210524013411.pdfIn PDF document text
    • http://kayapaliinsaat.net/file/21419311824.pdfIn PDF document text
    • http://reikihaus.com/clients/75291/File/27876133278.pdfIn PDF document text
    • http://studiotecnicofrisoli.com/userfiles/files/40700112426.pdfIn PDF document text
    • http://ceresasrl.it/userfiles/files/lokuv.pdfIn PDF document text
    • http://yangs-ns.com/ckfinder/userfiles/files/20210602205038.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=libro+de+matematicas+2+grado+secundaria+resueltoPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c140.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC140 11028 bytes
SHA-256: 33788ced19367b92128a1b1eeceb83e9dd93f0d4eca2a9495362d235ffaec55a
font_01_sfnt_off0000dac1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAC1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f2d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D3 16812 bytes
SHA-256: 7e08d7d92e0105d0967001403860a3f9b2bba5a983029ae04918a084d2b3c10e

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