Malicious PDF — malware analysis report

Static analysis result for SHA-256 d118a54c489754a3…

MALICIOUS

PDF

92.0 KB Created: 2021-09-21 00:59:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 19c9320ac4fcd6f243cae3e89721bcd5 SHA-1: 0dcb3d36e15399727421b4f55fb3eccf5a503eec SHA-256: d118a54c489754a32607e1b74073cc8321b5fd701eb33e9fb5acaa58b600b24d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a ClamAV detection for a phishing trojan and an ML classifier. It functions as a link farm, containing numerous URLs that point to potentially compromised websites or disposable domains. The primary purpose appears to be directing users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://synerhu.ru/uplcv?utm_term=how+to+get+minecraft+pe+on+android PDF link annotation
    • https://vr-spagna-20.effievirtual.com/galeria/files/69264781964.pdfIn PDF document text
    • http://mid-europe-ex.com/images/blog/file/34124029243.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/04e60eb177aa53d014e7a5fa5dd4d792/namefijinupaxef.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613459aa86336---35671091784.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16137fc29bdec2---fudapeketajakigonizavug.pdfIn PDF document text
    • http://studioiulianella.it/userfiles/files/gomuloreninela.pdfIn PDF document text
    • http://balashixa.inhome360.ru/admin/ckfinder/userfiles/files/77987299780.pdfIn PDF document text
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/12736225735.pdfIn PDF document text
    • http://ncfc.com.tr/ckfinder/userfiles/files/70794272862.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/zararewededazif.pdfIn PDF document text
    • https://southafricapools.com/contents/files/24658459254.pdfIn PDF document text
    • https://asiquim.com/ckfinder/userfiles/files/49555571074.pdfIn PDF document text
    • http://stroyindustry.com/userfiles/file/99092403771.pdfIn PDF document text
    • https://satbietthu.com/luutru/files/ropowinop.pdfIn PDF document text
    • https://europartner2.pl/uploads/kilapolilogipugabuwo.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/1613334759d39b---vixuvebuwim.pdfIn PDF document text
    • https://smartstone.ca/userfiles/files/3904786750.pdfIn PDF document text
    • https://usgcambodia.com/userfiles/file/tilurixarerozabez.pdfIn PDF document text
    • http://www.americaninvest.net/upls/files/pumuvabojukonutegopumox.pdfIn PDF document text
    • http://simsoncantho.com/userfiles/file/tibado.pdfIn PDF document text
    • https://rajatotogroup3.com/contents/files/wobemigesipazoxedo.pdfIn PDF document text
    • http://3qbuy.com/CKEdit/upload/files/21171765443.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fe5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE5B 19440 bytes
SHA-256: 2edcbc52147514a022c54e269706294a56e866d5dcdcd6a3ae3753ee66dcf1a5
font_01_sfnt_off000131fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131FD 10824 bytes
SHA-256: 6b9f5f71674fad1ae9baf005767fd05b4a0e12840d9a8a00f775a86e9c7f34a4
font_02_sfnt_off00014ac1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14AC1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1