Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd85e922d4b40b27…

MALICIOUS

PDF

79.4 KB Created: 2021-09-16 20:22:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2a049dd9cdfdb31fb86eb242becbda0a SHA-1: 324ecbfa0dc9c0f96f4256db95c36b43869f01a7 SHA-256: fd85e922d4b40b272bca7fd4a0ff9b06a5ab297bd221fa213990eb0a7bdac8b5
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. Heuristics indicate the document functions as a link farm, directing users to multiple potentially compromised or disposable hosting sites. The presence of numerous unknown URLs suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://prota.ru/upload/files/43627651895.pdf In PDF document text
    • http://ceomit.com/fckupload/file/wasewafugivekizisa.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161417123bc5b2---pekamegobobiraze.pdfIn PDF document text
    • https://vinacomvietnam.vn/uploads/news_file/94021663326.pdfIn PDF document text
    • http://tnslib.net/userfiles/files/taxanem.pdfIn PDF document text
    • http://telekommarketing.com/firme_data/files/lojitiweziruja.pdfIn PDF document text
    • http://tucholainfo.pl/userfiles/file/nakutelegakurasoguzelipob.pdfIn PDF document text
    • http://smcertificationservices.com/userfiles/files/35725569988.pdfIn PDF document text
    • http://quangcaosms.org/media/ftp/file/mofive.pdfIn PDF document text
    • http://health-bridge.in/upload/file/tuxikodalaxeru.pdfIn PDF document text
    • https://tjp2-hotlink-j3t.com/contents/files/sebefamugivedu.pdfIn PDF document text
    • https://sofupingame.com/calisma2/files/uploads/vonag.pdfIn PDF document text
    • http://snap-drone.com/userfiles/file/93812859323.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1612f608eb1dce---daruromumawi.pdfIn PDF document text
    • http://fratellibeninca.com/images/file/11625402695.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a4b8a78052---41996563574.pdfIn PDF document text
    • http://abaj.cz/UserFiles/File/wunotegepalomenu.pdfIn PDF document text
    • http://antonioruizabogados.es/userfiles/file/35136884719.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613beeb192df5---51504835879.pdfIn PDF document text
    • https://ver9.sonikgps.com/ckfinder/userfiles/files/sujifabewot.pdfIn PDF document text
    • http://thangmayedex.com/webroot/img/files/kupelivexariborolivujukeb.pdfIn PDF document text
    • http://defhjdr.friend-match.com/upload/files/42592447421.pdfIn PDF document text
    • https://cantarefides.ro/admin/userfiles/file/33831558623.pdfIn PDF document text
    • http://ellev.fr/upload/files/73146768088.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=turn+phone+into+computerPDF 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_off0000d63b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD63B 16596 bytes
SHA-256: 747d4ce0af4a45f7493c39b9d07943267e2354107b64ced00e9552254049b5a9
font_01_sfnt_off000100cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000118e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118E4 10328 bytes
SHA-256: 4c6e8ff4b28d6328f68c144d0129dfafc139abc39045fe58f526122d8508c98b