Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1a7987d86708fe7…

MALICIOUS

PDF

85.2 KB Created: 2021-09-13 15:37:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d7549ae23ac79638990112047160ffdd SHA-1: 2640ec836c7cc07211bcd0f19f1e396f8fdc367f SHA-256: c1a7987d86708fe71f33445cc6756808c18e6cd2ece6385b6bd21165b85ffa89
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Several heuristics point to the PDF acting as a link farm, with many URLs hosted on compromised CMS uploads and disposable domains. While no scripts were extracted, the PDF structure and numerous external links suggest it is designed to lure users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://marbeyoyun.com/calisma2/files/uploads/bivat.pdf
    • http://www.examnotice.in/uploads/files/vireribiloli.pdf
    • http://insuralead.com/userfiles/file/puzusima.pdf
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/16133ab5650f93---sikexokenisizafofo.pdf
    • https://greenfins-thailand.org/uploads/file/wuwafalenomelexalajevex.pdf
    • http://tauroconsulting.pl/userfiles/file/mevedibujude.pdf
    • http://columb-sklep.pl/userfiles/file/kitonagulalabos.pdf
    • http://hotelpenza58.ru/ckfinder/userfiles/files/lukeseg.pdf
    • https://kebecelectrique.com/upload/editor/file/86132851635.pdf
    • https://sproname.com/files/userfiles/files/35283995672.pdf
    • http://yao-cheng.com/uploadfiles/20210906080027.pdf
    • http://yyfxsw.com/upload/files/42988053180.pdf
    • http://ktai.lmg.jp/upload/file/85717616070.pdf
    • http://avstralianature.ru/ckfinder/userfiles/files/zaxonomesavijezinub.pdf
    • https://equimat-cheval.fr/file/subuponafixobuziref.pdf
    • https://bientannamhuy.com/wp-content/uploads/files/gotamimimipukebudo.pdf
    • https://petrovsky14.ru/docs/files/bapusumuwipopidomuxu.pdf
    • http://psychanalyste-gard.fr/ckfinder/userfiles/files/17703114564.pdf
    • https://cakenflowersonline.com/userfiles/file/79470027334.pdf
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612edc63cf4b7---jafixamu.pdf
    • https://energiadirect.pl/application/resources/ckfinder/userfiles/files/rativivexurizira.pdf
    • https://nguyenvanhuongloc.vn/app/webroot/files/images/pages/files/seves.pdf
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/1613257d261beb---juxaruner.pdf
    • https://optimuselearningschool.aels.edu/learning/site/images/uploadfiles/11494994443.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=mejores+app+para+editar+fotos+android
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e64f.bin
0a4fdb7eb1bb17ed75793e5a837dfc4673d20c6949228f07a34033ac275b13c3
pdf-font-stream PDF embedded font (sfnt) at offset 0xE64F 18940 bytes
font_01_sfnt_off00011617.bin
1d6621e5c3209823a8a6d9989c7c1402af5f0fecb63ac958049dd4f965cd92e8
pdf-font-stream PDF embedded font (sfnt) at offset 0x11617 10568 bytes
font_02_sfnt_off00012e52.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12E52 16792 bytes