Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b66a0cfb1e39be7…

MALICIOUS

PDF

86.8 KB Created: 2021-07-04 08:05:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 3a4c9b177f6a7c3401dbb3c4511e0508 SHA-1: eb6c82c453922ad20bbbcced31cdeb06d027a1d6 SHA-256: 0b66a0cfb1e39be700aad05d02bd03b19510bd24a1b349043deb1808184f6f96
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 likely lead to phishing pages or further malware downloads. The presence of multiple external URIs and compromised CMS upload links suggests a coordinated effort to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://garglob.ru/uplcv?utm_term=case+study+method+of+research+pdf PDF link annotation
    • http://bmhs71.com/clients/c/c9/c97ff408e01126d63256cf68004d6641/File/2804595163.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/99ed6d61b40a4d4bc002cd2307311056/verekegigofojededuta.pdfIn PDF document text
    • http://yucehukuk.com/resimler/files/guzelivalavuwagizisejuka.pdfIn PDF document text
    • http://remobudostol.pl/pliki/jularetinokidujogawixu.pdfIn PDF document text
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/4bb7f8c351f4c93622749ce349a134d2/83773745876.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16093e5618ce26---22772732301.pdfIn PDF document text
    • http://vyveva.eu/UserFiles/File/95610308675.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/dapivo.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/9ag0idrt82ermkm22oqeqt5j10/xolojujimajezexonaniwuxi.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/36da542e0462c38c1ee632f69cacc880/91637111280.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160858ef25e845---nisilogipokagi.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b136eb444e---rikokinumojoleve.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/hl6go8dn3k1jg8l1cqlne8o381/konupotudobudazixodep.pdfIn PDF document text
    • https://pousadamarazul.tur.br/wp-content/plugins/formcraft/file-upload/server/content/files/16093f78ddfec7---gunuvovetizawamufajupig.pdfIn PDF document text
    • https://yingzhaoliuart.com/upload/file/88506587763.pdfIn PDF document text
    • http://backkwang.com/userData/board/file/jirexelotixivero.pdfIn PDF document text
    • https://mosconi.net/userfiles/file/lawitakevupobibolej.pdfIn PDF document text
    • http://learnazia.com/fck/imagesfile/pedibatififoremete.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/mokilawinejusulo.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afd3dfeb1c4---bogumetapufigegosif.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c20cbcaa32e---38369222402.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16075b2808749c---3978982976.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/1c55ce2e1d76bdb84a6ae436a7aa8c7f/90939662095.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/16084711b661c7---85008890857.pdfIn PDF document text
    • http://henanshuangxin.com/d/files/55156485963.pdfIn PDF document text
    • 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_off0000f1ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000109fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109FC 16532 bytes
SHA-256: 15e3c824a87e1170d6740d52e9d161acc84accb1c34da8a937f5c2a190a4fa77
font_02_sfnt_off0001346c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1346C 10888 bytes
SHA-256: 457bc5e32394ecf1b9ff15a3aefe6ee5175438e7568da480e9bdd943fe45d2a9

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