Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a1245f08e84c5a4…

MALICIOUS

PDF

82.5 KB Created: 2021-10-16 18:23:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 1ba3931e6b5528a882bdbafd2ea6c083 SHA-1: 8618d47afe5c164328493cda2a593d766a2e833c SHA-256: 1a1245f08e84c5a48b4a529c49191d5f7184209ff0d9b30b686c7ad45c929fb4
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious content. The document body is heavily obfuscated, preventing a clear understanding of its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://hotelgaric.com/upload/datoteke/jezofadikegefik.pdf In PDF document text
    • http://quangcaosms.org/media/ftp/file/85168159637.pdfIn PDF document text
    • https://matharu.ae/userfiles/file/xitetekixaluvuxag.pdfIn PDF document text
    • https://www.playitdirect.ca/ckfinder/uploadfiles/files/19845437837.pdfIn PDF document text
    • https://thai-airpark.com/ckfinder/userfiles/files/96608889329.pdfIn PDF document text
    • http://ahzycw.com/upload_fck/file/2021-9-29/20210929155056998796.pdfIn PDF document text
    • http://xn----ftbkdcamitb5h.xn--p1acf/files/fck/file/kijilexewegepix.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/f52224254ddb42c23bf1d24c640b2fad/sogoremewirugixosiwib.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613a3fbc71bae---bibinijijobibademivigosi.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/43cfdf813e69bd1b4c35999bf70b95b6/17929174901.pdfIn PDF document text
    • https://flour.co.uk/ckfinder/userfiles/files/36905637822.pdfIn PDF document text
    • http://detskaoptika.cz/ckfinder/userfiles/files/71303712211.pdfIn PDF document text
    • https://fratellifurloni.it/file/14542309550.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/ab218a1bea8a07a179098c4286d0177c/22327361508.pdfIn PDF document text
    • https://mancomunidadvaldizarbe.com/userfiles/files/fikulabiros.pdfIn PDF document text
    • http://nsfeed.com/_UploadFile/Images/file/64826591494.pdfIn PDF document text
    • http://aroma-es.red/yamituki-n/uploads/files/damunik.pdfIn PDF document text
    • http://dzstock.com/Upfiles/file/zekazekimotixafogimukit.pdfIn PDF document text
    • https://sikahaiphong.com/images/news/files/sigafexutagunawevilusuxo.pdfIn PDF document text
    • http://fcraregistration.com/UploadedData/file/48280950728.pdfIn PDF document text
    • http://studiomuraca.eu/userfiles/files/xesexunup.pdfIn PDF document text
    • http://homespakistan.net/magzine/uploadfiles/file/vedofupititamuki.pdfIn PDF document text
    • https://xn--q3cceuw0c6ab0d2ii.com/upload_file/files/regezu.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/HTGXzuRVGb4/uplcv?utm_term=i+want+you+to+love+me+i+want+you+to+stay+lyricsPDF 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_off0000ddb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDB5 17576 bytes
SHA-256: cc46c0187d4e96c18a2b0e06432a3a7479aa9b67b1b752ce89ba6b20639abff2
font_01_sfnt_off00010ba1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BA1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000123b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123B8 10708 bytes
SHA-256: 91ff3f9fb126b8ebe4f943e827024720ed1b78ea9d6116a204ae0e3d07bed3cd