Malicious PDF — malware analysis report

Static analysis result for SHA-256 375d5528030d0994…

MALICIOUS

PDF

102.7 KB Created: 2021-08-04 14:56:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6cd6c85f46432e1f6be2c52b6446840b SHA-1: 4a6a72245fcd744d35d888e628f2d3523c077b12 SHA-256: 375d5528030d09948a3d54a9a1c2f2c0b999c9fa4a3fa5b9732dd06a124238c9
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, indicating a high likelihood of malicious intent. The document functions as a link farm, containing numerous URLs pointing to potentially compromised or disposable hosting domains, which is a common tactic for distributing phishing content or engaging in SEO manipulation. The presence of multiple links on disposable hosting and the use of UTM parameters further support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9879

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://utuin.net/files/fckeditor/file/25366135842.pdf In PDF document text
    • http://pasted-radio.de/web/files/1742823176.pdfIn PDF document text
    • http://plnjl.com/userfiles/files/wuzatomaneteriv.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c39c3650ad5---36105291340.pdfIn PDF document text
    • https://mashura.co/userfiles/files/lasolot.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/u3p3jthgmqcdvji7mmduofstr2/80743593041.pdfIn PDF document text
    • http://gioiacompany.net/images/upload/file/57678931875.pdfIn PDF document text
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/g40iuopbbnk44egh9jevruqs33/pufufixepi.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a79a513a7a6---ligosidejaferamaketirefej.pdfIn PDF document text
    • http://scales-center.com/shop/fck_file/file/tezapaval.pdfIn PDF document text
    • http://riverhouse.at/pcms/content/file/44487568566.pdfIn PDF document text
    • https://tecnomatec.cl/upload/file/10659868718.pdfIn PDF document text
    • http://christopherdallo.com/file/64376659184.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609287256e4b4---52742880540.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/f172837d4b098a5d25fe2f8b73f52bd4/7408809241.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099bb8ba511e---42103301167.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/85850531966.pdfIn PDF document text
    • https://abyway.lv/images/ck_images/files/37077158007.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/0d63f9894ff11f76c98272fceec45e2a/63194401296.pdfIn PDF document text
    • http://asbu.net/uploads/FCK_files/file/13843780737.pdfIn PDF document text
    • http://albertopizzetti.it/userfiles/files/rimanadakati.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607dbbd3c661b---496485310.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/3a5e33363674e015b75181ccd1335d47/muwomowogojaxomopiluxuka.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/nhmhqjj8e7enibjne02ntpfd38/zaxokisexunevegakijiw.pdfIn PDF document text
    • http://hzdshg.com/images/upload/File/45744282009.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=glacier+bay+top+load+water+dispenser+manualPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000112ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012ac4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AC4 11156 bytes
SHA-256: ac7aec4d2ab93a7fc838066150bd254448fb849ff8a29a8f361bdf1779206261
font_02_sfnt_off000144ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144AC 16068 bytes
SHA-256: 626b7c8f39d92c15a08a3ca4bc52fbf6ba2648b461fd8ff24e7d9852eaf99fa2
font_03_sfnt_off000159c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x159C4 18716 bytes
SHA-256: ca9533ed80c1fd4e3f55be8cc1b0e1d9f9001f48c66a98d2a8d581cbccd56680

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