Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4ef02a229a7bb2a…

MALICIOUS

PDF

95.0 KB Created: 2021-09-18 16:21:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6ddf7634d63ea3a1029144dc11185eaa SHA-1: 114923370b9519a68ba4cff48a2888fa30374cfc SHA-256: c4ef02a229a7bb2a2e63c1cceeb25d3877d0304bb1f2299398b3d8b7557a9c10
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to compromised websites, with one URL specifically mentioning 'mortal kombat 2 apk download', suggesting a lure for users seeking game downloads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the presence of multiple external links and the overall structure suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://lateonsettay-sachs.org/userfiles/file/liwesevafadofabepilaz.pdf In PDF document text
    • http://elektron.be/public/userimgs/files/38424828655.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/eef3b46be9fe555607c0848a65ef0c07/89620739615.pdfIn PDF document text
    • http://chinastom.ru/userfiles/file/wovivelapovo.pdfIn PDF document text
    • https://imagebeaute.fr/userfiles/file/50420197403.pdfIn PDF document text
    • https://fenicia.uy/fenicia.com.uy/uploads/files/57009901205.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141c7184bdca---225286587.pdfIn PDF document text
    • http://royalwedding.jp/images/blog/file/34982689660.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/e09f8ac016205e8d0a39d488b8f9f30d/sefimizasulizez.pdfIn PDF document text
    • https://lifesmart.lifesmart.ro/ckfinder/userfiles/files/35872890337.pdfIn PDF document text
    • http://thebookmarkcafe.com/uploads/files/70633491784.pdfIn PDF document text
    • http://chaodontuonglai.vn/uploads/ck_upload/files/40690109792.pdfIn PDF document text
    • http://zjbfjt.com/upload/files/sodusewovanukorewetemuta.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/161330daeeb0f9---xejexesunexuzidaxezenem.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/16141136ebbb04---33367203746.pdfIn PDF document text
    • http://quartierdete.fr/uploads/fckeditor/file/kedebu.pdfIn PDF document text
    • http://self119.net/upload/userfiles/2021/09/files/210918083522.pdfIn PDF document text
    • https://abctranslink.com/ckfinder/userfiles/files/nenijamutenoba.pdfIn PDF document text
    • http://nigerseedindia.com/uploads/71645245129.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16140bec5bb121---91544010549.pdfIn PDF document text
    • https://dursunguney.com/userfiles/files/sodapir.pdfIn PDF document text
    • https://commonlawhouse.in/userfiles/file/giremewebatukizow.pdfIn PDF document text
    • http://arenabilardo.com/data/_files/kelimixatizuweviwijizema.pdfIn PDF document text
    • http://picassogift.com/Uploadfiles/files/tuvezub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=mortal+kombat+2+apk+downloadPDF 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_off000108fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001210d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1210D 20212 bytes
SHA-256: b238ee9190733c8d5eb6655b13b04aec61ff5ca272b68a49ea379a42be289ee0
font_02_sfnt_off00015616.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15616 10592 bytes
SHA-256: 829a95826ec077fc4a280814b10bbab75e957f0095cef5634ffe2ab81292a5f9