Malicious PDF — malware analysis report

Static analysis result for SHA-256 1157524b60435889…

MALICIOUS

PDF

84.7 KB Created: 2021-09-18 14:20:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 686e5d33ea74bb395f1cb2d50fcb1990 SHA-1: 3464cd745b26cc8a212dca8ebd3c643e075600a1 SHA-256: 1157524b60435889e1d8afdd82e14bd0aa7bf586e3ca5c8d4ede4adc0fc1a9e6
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains a large number of external links, many of which point to compromised websites or disposable hosting, suggesting a phishing or redirection scheme. The presence of multiple PDF link farm heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://seeandhearbetter.ie/img/shop/contents/98508493706.pdf In PDF document text
    • https://catbasailing.com/upload/fck/file/47074989356.pdfIn PDF document text
    • http://babijie.com/upload_fck/file/2021-9-11/20210911031539550641.pdfIn PDF document text
    • http://hoaisonland.vn/upload/files/kodef.pdfIn PDF document text
    • https://cristalparkhotel.com/ckfinder/userfiles/files/vufamemalazolazirilap.pdfIn PDF document text
    • http://agrocare.hu/ckfinder/userfiles/files/titakelepa.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132b9e26aa07.pdfIn PDF document text
    • https://asmitahrgroup.com/ckfinder/userfiles/files/tuxewa.pdfIn PDF document text
    • http://thegioimercedes.com/upload/files/367375651.pdfIn PDF document text
    • http://heimundsicherheit.de/userfiles/file/xasikazokugojujirizi.pdfIn PDF document text
    • http://koryosushi.com/uploads/files/femisosawogokiwasojutu.pdfIn PDF document text
    • http://dh-cell.net/ckfinder/userfiles/files/xotogejejunisamin.pdfIn PDF document text
    • http://privateeducation.sg/verzsape/demo/upload/admin/files/vumukowuvulibafaduzij.pdfIn PDF document text
    • http://versobrokers.eu/userfiles/files/ropijeporiluvopogax.pdfIn PDF document text
    • https://pasarangroup1.com/contents/files/bejupizaxal.pdfIn PDF document text
    • http://industrialdevices.in/uploads/1058162677.pdfIn PDF document text
    • http://aurora-c.jp/files/files/11646199995.pdfIn PDF document text
    • http://tongrentangthai.com/UserFiles/file/ralurogiwasavize.pdfIn PDF document text
    • http://ouhkpthaa.org/userfiles/fozawivofurapafaper.pdfIn PDF document text
    • http://iseveranscopy.com/upload/editor/file/80091375986.pdfIn PDF document text
    • http://mbjarrahi.com/UploadedFiles/New/file/tufujewoxobukosunemezi.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1614032da12548---puruwolaxijerifalomuwo.pdfIn PDF document text
    • https://clubon.top/uploads/files/davapexemoxasuna.pdfIn PDF document text
    • http://lenosada.sk/editor_uploads/files/38605393742.pdfIn PDF document text
    • http://studiotecnicomaglio.it/userfiles/files/minulinolizologe.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/ta0bpmhev85b59hchq55lbo3fb/boputobalivamakovazevug.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=fuchsia+os+smartphonePDF 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_off0000e86d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE86D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001007f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1007F 16968 bytes
SHA-256: bfb0f57674af995153b7f4096f73ae613406a6c3ecb0ef2e9ac3344dd2d50254
font_02_sfnt_off00012c7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C7D 10672 bytes
SHA-256: b922332ef2cb49b71707cb4a1a1f1e3d55ba0d1eefed5df56a2402d6d14a8461