Malicious PDF — malware analysis report

Static analysis result for SHA-256 edbec903daa5a752…

MALICIOUS

PDF

79.3 KB Created: 2021-09-15 23:58:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 32c419f39285628b7153f62c050624a5 SHA-1: e2c9fd6210d60edcab91389cec8e8be98af4ab7a SHA-256: edbec903daa5a75271757a9af8919b0dfc8c8821fec86e974aafb71275203bf1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains a link farm pointing to numerous compromised WordPress upload directories and disposable hosting sites, suggesting an attempt to redirect users to malicious content. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://lube-stc.com/ckfinder/userfiles/files/44381249646.pdf In PDF document text
    • http://kimwendelldesign.com/ckfinder/userfiles/files/37261398610.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/161384e5db52e1---torigo.pdfIn PDF document text
    • http://ingmarcofaedi.com/userfiles/files/17706038206.pdfIn PDF document text
    • http://tecs4.com/intranet/ckfinder/userfiles/files/divitok.pdfIn PDF document text
    • http://derp74.fooden.com/UserFiles/files/91245570043.pdfIn PDF document text
    • http://www.tlo.ntou.edu.tw/ckfinder/userfiles/files/24734522841.pdfIn PDF document text
    • http://weighlessthisyear.com/ckfinder/userfiles/files/14281178567.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613cb3aae876c---wivozepivufikitesiruj.pdfIn PDF document text
    • http://zsdbiopharm.com/upload/files/62892433548.pdfIn PDF document text
    • https://burlingame.com/wysiwygfiles/file/69581188622.pdfIn PDF document text
    • http://novena99.com/uploads/files/202109101805568456.pdfIn PDF document text
    • http://ambvetfanini.eu/userfiles/files/witofopimiradenemo.pdfIn PDF document text
    • http://tuzoltosagmihald.hu/userfiles/file/20528958702.pdfIn PDF document text
    • http://itcck.org/upload/editor/file/86054349953.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613c1e2dba544---36119927961.pdfIn PDF document text
    • http://thegioixedap.net/upload/files/74324827445.pdfIn PDF document text
    • http://www.hz-kontejnery.cz/ckfinder/userfiles/files/vitepuraj.pdfIn PDF document text
    • https://copyjokertw.aw6.tw/uploadfile/qu4_qu106_com/files/22036538993.pdfIn PDF document text
    • http://phubozena.pl/userfiles/file/mukubapijilonularagim.pdfIn PDF document text
    • http://ibshop.gr/uploads/_uploads/files/35996863606.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/a6d9af7dd614570d5f050d0a42f6291a/8299567484.pdfIn PDF document text
    • https://aep-tc.com/cache/fck_files/file/81256137068.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/dff4f65725c0928c9ca4e0dda0a66606/guvubagaxevatebuzomoz.pdfIn PDF document text
    • https://horacebatten.com/ckfinder/userfiles/files/29793797392.pdfIn PDF document text
    • http://101-games.ru/images/uploads/files/52056654241.pdfIn PDF document text
    • https://ddnepal.com/assets/userfiles/files/govejemabevidisukalomi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=mod+apk+pokemonPDF 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_off0000d254.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD254 10132 bytes
SHA-256: 7c42ee33eb1d86fe33e7921f10d98a73b395e5ad6ea78ee4aa610f2333dc163b
font_01_sfnt_off0000e8de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8DE 18068 bytes
SHA-256: 1df33e6e8ee173046dff98df68f3de32b17ec3853de41c38c4944bfeac5b0847
font_02_sfnt_off0001179d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1179D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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