Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd0e887eaec7102d…

MALICIOUS

PDF

83.0 KB Created: 2021-09-20 23:12:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 92252ec8b77bca471e948b0c4e31b732 SHA-1: 65f9cdc5fa086e97d559330602ead0c6dcf3efc0 SHA-256: cd0e887eaec7102d5ee3035f2f609ef949d0057ca757330502c0cd5e128bf87b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The document body was unreadable, but the presence of numerous external links strongly supports the link farm attack pattern.

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 http://hakanhurdacilik.com/userfiles/file/mudilapaj.pdf In PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16134daa092520---vokivudaxifelibuz.pdfIn PDF document text
    • https://jackinthegymtpe.com/uploads/files/202109102038219046.pdfIn PDF document text
    • http://inphuduong.vn/upload/files/niwakiluritiwigoxu.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c42502c9d7---losawedibebajo.pdfIn PDF document text
    • http://dc-42351dc5a6b3.prshots.es/uploads/userfiles/1630966139/files/11008910355.pdfIn PDF document text
    • http://thegioixedap.net/upload/files/49106987669.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e59a5ba9ca---58066379519.pdfIn PDF document text
    • http://vanillasky-ch.com/images/files/xemesemenivor.pdfIn PDF document text
    • https://agriturismoilcolle.org/userfiles/file/82960994722.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144e75d3f7c7---60138767352.pdfIn PDF document text
    • http://chongthamnguoc.vn/img/files/fuvup.pdfIn PDF document text
    • http://lapempi.nl/ckfinder/userfiles/files/18856563209.pdfIn PDF document text
    • http://www.malagatour.es/ckfinder/userfiles/files/29842126462.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134d9e9bc620---18984472826.pdfIn PDF document text
    • https://red-adlay.com/upload/files/mugenerarisixarere.pdfIn PDF document text
    • https://haysalon.com/public_html/userfiles/file/47080534513.pdfIn PDF document text
    • http://pk.mo/userfiles/file/jubidaxaxed.pdfIn PDF document text
    • http://tsg-vaganovskoe.ru/ckfinder/userfiles/files/wirobagogopub.pdfIn PDF document text
    • http://firegallery.ru/img/upload/fisexexavipapajebu.pdfIn PDF document text
    • http://alrabbanoilandgas.com/file/files/34532345970.pdfIn PDF document text
    • http://postelezmasivu-brno.com/ckfinder/userfiles/files/falunikutevaxopave.pdfIn PDF document text
    • http://landroverbh.com/ckfinder/userfiles/files/subamo.pdfIn PDF document text
    • http://saeronbio.com/userData/board/file/rozibedem.pdfIn PDF document text
    • http://www.swaving-stalinrichting.nl/ckfinder/userfiles/files/7668824197.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=spooks+series+2+castPDF 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_off0000de8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE8F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6A6 10504 bytes
SHA-256: d95eeb122ed55394ce68f14e03528c0a8d6b0162203a9516e118f157d1b9d1b2
font_02_sfnt_off00010ebf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EBF 18616 bytes
SHA-256: 4d777b2bb7787f0d4b18c7b7a5c20c189aeec64adddae3a460d6a090e3c81604