Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7281a102ac7b0d1…

MALICIOUS

PDF

74.1 KB Created: 2021-09-25 10:01:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5595470f2bc8f8c33c763e42be9c0b0a SHA-1: d63d7f916a889e9da66a5a51067eb801d4fc5199 SHA-256: f7281a102ac7b0d19153cc86447f3654f660109d7cf5bb78af1a2b433a35fbeb
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://www.cottagegrad.ru/files/file/fumelerebaked.pdf In PDF document text
    • http://pizzeriagiganti.ro/imagini_ws/gozimesezo.pdfIn PDF document text
    • http://tantex.org/tantex/tantexuserfiles/file/pumewedukalobifu.pdfIn PDF document text
    • http://iburgisidimarsala.eu/userfiles/files/30616189366.pdfIn PDF document text
    • https://maintogelonline2.org/contents/files/88078555418.pdfIn PDF document text
    • https://vleek.com/uploads/files/3863069165.pdfIn PDF document text
    • https://invest.pl/userfiles/file/17873244203.pdfIn PDF document text
    • http://mrrb.nexgendevgroup.com/files/xemitupevanemot.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1612f6cfdc33b2---semulesizipukatupetus.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145d3c4a75c9---limitubetaruxixiw.pdfIn PDF document text
    • https://mtestbd.com/assets/uploads/files/56404949188.pdfIn PDF document text
    • https://kurishupally.org/userfiles/file/88657279230.pdfIn PDF document text
    • https://sensesgrouphk.com/louis/STARKGROUP/ckfinder/userfiles/files/17807337503.pdfIn PDF document text
    • https://dehayemek.net/upload/ckfinder/files/wivuxidijo.pdfIn PDF document text
    • http://theexplorerthai.com/userfiles/files/fowizabiz.pdfIn PDF document text
    • http://slkuang.com/v15/Upload/file/2021919450553049.pdfIn PDF document text
    • http://www.aceitunasdelguadalhorce.es/ckfinder/userfiles/files/texudovenopakam.pdfIn PDF document text
    • https://saksisan.com/upload/ckfinder/files/desagagewulekarimabonaw.pdfIn PDF document text
    • https://maximatrimony.com/ckfinder/userfiles/files/senokefigisivilazite.pdfIn PDF document text
    • http://sun-tes.ru/files/file/21325684929.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132fed759cdd---tuxuselopo.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614071d5b9c48---95210735437.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=document+viewer+app+for+pcPDF 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_off0000ba57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA57 18184 bytes
SHA-256: f6ec19c8bceef29ef49a7d8cab4f0c3dfb9ff0941345722acc18654a29be3b76
font_01_sfnt_off0000e9d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9D8 10680 bytes
SHA-256: 0e4866633ad825e9da15a894beb7aa50406818a7cdff2e4e4d69611d4443e8e6
font_02_sfnt_off00010259.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10259 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1