Malicious PDF — malware analysis report

Static analysis result for SHA-256 9caefcf900143039…

MALICIOUS

PDF

83.4 KB Created: 2021-09-13 16:00:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d5a9c5d231d1e0f08598cef9b9413bd6 SHA-1: 449dc4661e99e90c6305f8b4b440c9d2a0c9fdd5 SHA-256: 9caefcf9001430396fa444c46b2e8706ef1dd7d0e23be08dddb3b5bc3d844392
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://studio70.eu/userfiles/files/21911230188.pdf In PDF document text
    • http://lexxyin.net/files/fckeditor/file/4886043769.pdfIn PDF document text
    • http://busangh.com/attfile/fckimg/file///2021091263014_687816353.pdfIn PDF document text
    • https://veaodaibrahma.com/uploads/image/files/5298890062.pdfIn PDF document text
    • http://tecniagua.es/uploads/ckfinder/files/litibesojaru.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/161305dd14eef4---muvemiwora.pdfIn PDF document text
    • http://fslawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xominosupojifedes.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/4k2s3btnq0i2qsfenh7i21cd38/3349336745.pdfIn PDF document text
    • http://mauchlineware.com/html/chapelstreet/web/userfiles/files/powuvaburaluruzuwane.pdfIn PDF document text
    • http://hexindechem.com/upload/files/12526767518.pdfIn PDF document text
    • https://asharfilalkulfi.com/ckfinder/userfiles/files/21934194641.pdfIn PDF document text
    • http://uni-farm.pl/ckfinder/userfiles/files/31428188207.pdfIn PDF document text
    • https://iringmalaysia.com/ckfinder/userfiles/files/50152460419.pdfIn PDF document text
    • https://baruipur.org/ckfinder/userfiles/files/degasu.pdfIn PDF document text
    • http://bischofs-scheune.de/userfiles/file/45443600518.pdfIn PDF document text
    • http://qataminational.com/uploaded_files/userfiles/files/10109548085.pdfIn PDF document text
    • https://greenbins.ca/ckfinder/userfiles/files/famusonifelag.pdfIn PDF document text
    • https://www.tahitotfaluovodak.hu/ckfinder/userfiles/files/91249179592.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613eaf042a552---4005926955.pdfIn PDF document text
    • https://knoxvilleremembers.com/media/sarajejukebu.pdfIn PDF document text
    • http://happysmilecard.com/uploads/files/75081696799.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d9c117eff8---45496397007.pdfIn PDF document text
    • http://goksirlambinowice.pl/img/upload/files/95886950487.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/49665344317.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=mad+skills+modPDF 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_off0000e196.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE196 10060 bytes
SHA-256: 5fe22ee6f3607923dca0bfff6f46c2a523936d855306cd34071acc012962c6c2
font_01_sfnt_off0000f7e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7E2 18304 bytes
SHA-256: 90ad14147ab26c2229c0e5244a955910c69328fe4d98cf94c3ef39df44fabbfd
font_02_sfnt_off000127bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1