Malicious PDF — malware analysis report

Static analysis result for SHA-256 371b557266b5a863…

MALICIOUS

PDF

89.7 KB Created: 2021-09-04 17:16:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9b425a7362ae8151502a7bbea4d7dd9d SHA-1: 98f217c101a95f153ad30262f39f8efcb4fa1576 SHA-256: 371b557266b5a863f20dac4d7c4402763b7abc27df7ee7eeb2fb03072d96c7f1
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed to redirect users. ClamAV detected this as Pdf.Phishing.Trojan, and ML classification strongly supports maliciousness. The file's structure and URL patterns suggest it's part of a phishing campaign, likely attempting to lure users to download further malicious content or provide sensitive information.

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://funkyspa.net/ckfinder/userfiles/files/35577568358.pdf In PDF document text
    • https://tjpapigroup3.com/contents/files/bizirerugulo.pdfIn PDF document text
    • https://tlproduct.com/userfiles/file/lovotolebakaroj.pdfIn PDF document text
    • http://artecgroupservices.com/imagenes/file/gimazawunepe.pdfIn PDF document text
    • https://edu-mate.kr/_UploadFile/Images/file/sizadetasokog.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160adf9a44273c---95398385999.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160850e75c4281---rijufekipugisutixutegibez.pdfIn PDF document text
    • http://melvin.cz/data/65663882373.pdfIn PDF document text
    • http://zhouzhuank.com/v15/Upload/file/2021620442579643.pdfIn PDF document text
    • http://qunjl.com/userfiles/files/64278515898.pdfIn PDF document text
    • http://findacommodity.com/upload/file/48752363241.pdfIn PDF document text
    • http://drkoopman.nl/cmsimages/file/42282418132.pdfIn PDF document text
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a2322d9ba49---nafukiduw.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16073f45a4334a---wirumopejesulefoleretuje.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d2c2e63ba7728c44e35e97f02cc2acf4/genevogawolowoxeda.pdfIn PDF document text
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/c083a024e4e6f84ce2857e50972e146e/nofanurewu.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/f2110b3fda68499b9e9ecc072cbcbbdd/106817838.pdfIn PDF document text
    • https://ls-machinery.com/uploadpic/files/202108141018315666.pdfIn PDF document text
    • http://surrattsville69.com/clients/8/81/8122276c22396d7fa0996010cc369f50/File/37895514994.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609dabeb31533---liloxibigapega.pdfIn PDF document text
    • http://tipiland.net/upload/file/butaxuruno.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160734d7a507aa---59098683164.pdfIn PDF document text
    • http://alotercuman.com/ckfinder/userfiles/files/13095065855.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=industrial+automation+and+robotics+book+pdf+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_off0000f7d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010fe6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FE6 18080 bytes
SHA-256: 19c7a848fad8da3bc9e309f61b6b3b4946560b4b6b33e08b358aa3a34efb408c
font_02_sfnt_off00013f2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F2C 11020 bytes
SHA-256: ab76c2649a7713854b932e0b7b53eb2df324745ea25e59dbdc8fbbbbaafeef53

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