Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b5f8c8491e1591c…

MALICIOUS

PDF

96.7 KB Created: 2021-09-02 19:48:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5d09ca911a0e00e852827dd8b9606cb7 SHA-1: aa3e8aee63390a686047b94dc6217f752ecd56b6 SHA-256: 8b5f8c8491e1591c2da89950b85698d10bf18dc77ba232e8f786dc67d4444fc3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to various domains, some of which appear to be compromised CMS uploads. The primary purpose seems to be redirecting users to potentially harmful content or facilitating SEO manipulation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://www.deep2001.com/images/library/File/11123039563.pdf In PDF document text
    • http://22vek-omsk.ru/fck_editor_files/files/zinapi.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607fcb716c8bd---4196896154.pdfIn PDF document text
    • http://thecountryclub32055.com/userimages/rimufuve.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/bbd7569e2ac55120e1f4eacca668e465/zisabemajubuta.pdfIn PDF document text
    • http://worldtile.net/jangheung/userfiles/file/98541373.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb2bd5a474---29486254974.pdfIn PDF document text
    • http://raczcsalad.hu/files/18403770362.pdfIn PDF document text
    • https://produktybhp.pl/pliki_user/File/ninefola.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/03ac6c4dfecb3a8d534d830b918063bd/51479557193.pdfIn PDF document text
    • http://kraski-chernila.ru/resources/file/79683256103.pdfIn PDF document text
    • http://myboydfamily.com/clients/7/7f/7f513a2250c12de81a70a6735749c289/File/wejuroposamafivu.pdfIn PDF document text
    • https://carcarnet.com/home/sandbox/domains/hkdance.tritek.hk/public_html/ckfinder/userfiles/files/63037070082.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d571b23ce64---6121912318.pdfIn PDF document text
    • http://szentimresiklos.hu/upload/file/fudidenuriwamolifaga.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/2k48r7b5an5ujmlvmeaeb2l474/6114215955.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/kawosivuruxixox.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/49ol00r4ls6fs22g5d88op5ci0/julumatuxekom.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ab57ea90558---fedufusuburexuwix.pdfIn PDF document text
    • https://gionggiacam.com/ckfinder/userfiles/files/lilupifonojokaxufowe.pdfIn PDF document text
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1606f19b61ac19---jusiwefaraboxefora.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.com/upload/files/nimimeborutozes.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=surah+ar+rahman+surah+rehman+full+pdfPDF 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_off00010a82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A82 10628 bytes
SHA-256: 1be46585266534778f27dc30caa072564fed7c6923db1133e7c2f929dea76635
font_01_sfnt_off0001228f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1228F 22472 bytes
SHA-256: 52aa4b158c0282b08b2e226b0bc391fc8ba5e8d304969a9155c0ab18357b1d72
font_02_sfnt_off00015ca7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15CA7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1