Malicious PDF — malware analysis report

Static analysis result for SHA-256 38634196ac34b0b0…

MALICIOUS

PDF

86.3 KB Created: 2021-09-13 14:31:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 48c083ba9103d5e1eea26850de48b4bc SHA-1: e57088e836cbd9d1059ea634eaed2997525450f1 SHA-256: 38634196ac34b0b0993436c7b992ce24b97475bce51913d6755d48ff0bdb889b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous links, many pointing to compromised CMS upload directories, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the nature of the links and the detection names point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://koncnc.com/genelresimler/file/35961463996.pdf In PDF document text
    • http://www.syrahresources.com.au/application/third_party/ckfinder/userfiles/files/17590980204.pdfIn PDF document text
    • http://e-district.org/userfiles/file/gajeketawigadok.pdfIn PDF document text
    • http://dental-forum.ru/userfiles/file/xatizagibeganiveg.pdfIn PDF document text
    • http://asu78.ru/userfiles/file/tepixudelexisavinazew.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/vol77q644dnsktfos9lamegim1/52273579078.pdfIn PDF document text
    • http://wasserburg.pl/userfiles/file/18520668989.pdfIn PDF document text
    • http://sudeoksa.org/userfiles/file/20210901082720.pdfIn PDF document text
    • http://hoteldanang.com/uploads/images/files/xepixawadowanuwupovipir.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16131b6a54cacf---27428534982.pdfIn PDF document text
    • http://freetourscadiz.com/ckfinder/userfiles/files/30457603200.pdfIn PDF document text
    • https://fobh.net/userfiles/files/44960709174.pdfIn PDF document text
    • https://martas.vodrsport.cz/uploads/files/90838502397.pdfIn PDF document text
    • http://pekingtogo.com/uploads/files/23626730329.pdfIn PDF document text
    • http://golfproradost.cz/webpagebuilder/ckfinder/userfiles/files/56974908852.pdfIn PDF document text
    • http://kerrya.com/ckfinder/userfiles/files/lomenubumasofi.pdfIn PDF document text
    • http://icmasistemas.com/userfiles/files/tatuwatarizasejogedurimal.pdfIn PDF document text
    • https://fiscalonline.ro/app/webroot/files/userfiles/files/85586681479.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139d52369d7e---23234997932.pdfIn PDF document text
    • http://snbedu.com/uploadfile/file///2021090521512499.pdfIn PDF document text
    • http://someteme.com/archivos/_20210902031513.pdfIn PDF document text
    • http://slovoveri.org/userfiles/dimiwelebujuvamuwuxasub.pdfIn PDF document text
    • http://yangs-ns.com/ckfinder/userfiles/files/20210912162155.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=pokemon+gba+cheats+rare+candyPDF 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_off0000e80d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE80D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010024.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10024 11028 bytes
SHA-256: 2d6965e7f10b006f7bc2098811d0f0435d3fb00fd19d7da22cd4873b20cd1259
font_02_sfnt_off0001197f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1197F 19040 bytes
SHA-256: 817c282b93c0a31a447380cf5b2524f7ee468a90e6e8fdcc2e1b3677c989f9ea