Malicious PDF — malware analysis report

Static analysis result for SHA-256 e136f12a93c0abce…

MALICIOUS

PDF

76.5 KB Created: 2021-09-19 15:52:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b1927396a6a58e0fe62b82546d9d102f SHA-1: df11abcaa5acecce2e58b4cb4a32dcc294fafaeb SHA-256: e136f12a93c0abcea9bd464da37275a17b21132cda9990757f2fd33f3bd26ebf
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. The primary attack pattern observed is the use of a link farm to direct users to potentially malicious external sites, consistent with phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://studiospazioambiente.it/userfiles/files/timetemelez.pdf In PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/161352601613fa---83363331679.pdfIn PDF document text
    • http://ville-dammarie.com/ckfinder/userfiles/files/kibosubewusizuboge.pdfIn PDF document text
    • http://old.smartplus.pl/ckfinder/userfiles/files/zenatedisetijexamidadera.pdfIn PDF document text
    • http://crystal-lamp.ru/uploads/files/wugujixemofasuwaruso.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16130cc30a4cdf---mujuludoma.pdfIn PDF document text
    • https://cleanenergy.mn/uploads/files/kixebanomomasujafi.pdfIn PDF document text
    • http://15441707.com/data/board/file/20210904040659.pdfIn PDF document text
    • http://daeryuhealthcare.com/ckupload/files/13073659093.pdfIn PDF document text
    • https://dollarplus98.com/images/upload/files/50522531488.pdfIn PDF document text
    • https://inprovitcaribe.com/ckfinder/userfiles/files/lutifadoxolipem.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/19felhra0ddtcg3j25euj2gga8/45577625832.pdfIn PDF document text
    • https://dutchfansitenetwork.nl/ckfinder/userfiles/files/34116253290.pdfIn PDF document text
    • https://samoinstitute.mn/uploads/assets/file/55694565901.pdfIn PDF document text
    • https://warungmimpishio.com/contents/files/sugigasexivanerisinodexiz.pdfIn PDF document text
    • http://narnivet.com/userfiles/files/rekabefufuwedezu.pdfIn PDF document text
    • https://www.gico.ge/ckfinder/userfiles/files/wejavef.pdfIn PDF document text
    • http://tw-sincere.com/upfiles/editor/files/65756785184.pdfIn PDF document text
    • http://ibrahimalsada.com/pics/file/9109658127.pdfIn PDF document text
    • https://concertwristband.com/resimler/files/7204647540.pdfIn PDF document text
    • http://metisentry.net/ckfinder/userfiles/files/8756425808.pdfIn PDF document text
    • http://revucue.com/ckfinder/userfiles/files/52652832202.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=ragnarok+x+iosPDF 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_off0000c07e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC07E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d895.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD895 10248 bytes
SHA-256: fdb4d06bda804a72a9185159371e5fbe0ced95f7ae5e7400ac342f2e6d23a546
font_02_sfnt_off0000efb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB3 20928 bytes
SHA-256: 0da8656da34555e734df5188620fa6ab1a31af6cefb6e67ffa10dde4e94d5723