Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c0c4a9c4d829617…

MALICIOUS

PDF

103.0 KB Created: 2021-07-15 18:28:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ed6c421e29be77d10c872bc7d6ce5108 SHA-1: 85adcf9611abbb9d145dbaa4f771ce3885f3bae0 SHA-256: 8c0c4a9c4d829617011c96d7bd99a3659b07f7382c19f9df6287125132ef1ad9
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed to obscure the final destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. The presence of multiple external URIs and link farms points towards an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9773

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://maekalocal.com/Maeka/UserFiles/File/12254673384.pdf In PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606d89c638e33---wabemubobupapugidutu.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/55e3298a80e783a54490589ca0dc1c9a/xasolavusewomozape.pdfIn PDF document text
    • http://lafenicealcamo.it/userfiles/files/8088685356.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/90454508764.pdfIn PDF document text
    • https://rdsdealers.com/ckfinder/userfiles/files/menewitenivev.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608ec2799d4d6---divelarigonoragoxezujuzos.pdfIn PDF document text
    • https://blsautomation.com/ckfinder/userfiles/files/66346261406.pdfIn PDF document text
    • http://valdhans.cz/userfiles/file/nurifasire.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1607548d35a956---gitarefapemamoxajovi.pdfIn PDF document text
    • http://yongqingtech.com/d/files/46608234744.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607216facb03e---fawezonojobutejiwexitax.pdfIn PDF document text
    • https://kurtoglumob.com/upload/file/9405372402.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/b328a592233fe10bd6d41098763d0288/2484825869.pdfIn PDF document text
    • http://cuboni.com/uploadfile/hong202106270550322394.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160a9f433278d7---84511756265.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b373bf11fb3---20665230308.pdfIn PDF document text
    • http://clair-environnement.eu/catalogue_dynamique/file/13658291450.pdfIn PDF document text
    • http://gmicropilotes.com/uploads/files/35976384189.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/c395df29c5a22f7b5b57e8b2896fe559/51928326680.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/0ngfdlfht8s34n0q0kcckt18de/96635853876.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/mirikodan.pdfIn PDF document text
    • http://rockfordauburn1966.com/clients/8/85/8549db0cc7d1f63cce07d3be93bd6f3d/File/sewol.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606fa14285f53---52846782364.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/uad428eksl9ir76v5nuu5kkun4/84923885744.pdfIn PDF document text
    • http://kaies.cn/upfiles/file/boragopo.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8b833b8ade---10809242297.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096f8bad4b98---2596316690.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=synchronize+with+internet+time+serverPDF 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_off00012d72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D72 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00014584.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14584 18156 bytes
SHA-256: cae9a4ad92203021264eaa63c9c29e334967261195373ff7eebf999ef61f7c03
font_02_sfnt_off000175c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x175C2 10688 bytes
SHA-256: dca14f84367d0a21102db3a6cfde1422b106f90a3adc0e356804e01df5388c0c