Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8ce0a21a77eddd4…

MALICIOUS

PDF

76.9 KB Created: 2021-09-17 12:25:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 617fe46bbf39001076bc798cae3370c5 SHA-1: 0c1f7ef95ce14167ca087fa3d2774cdd0b9c52ed SHA-256: f8ce0a21a77eddd4880f223e43c04d006b1c18b4f7aeca08ba9488e1141067de
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many distinct hosts, suggesting it's designed to redirect users to potentially harmful content. The presence of multiple unknown URLs further supports this, as they are likely part of the malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613f98af817f7---lojijipi.pdf In PDF document text
    • http://zlzljc.com/uploadfile/file///2021091602041570.pdfIn PDF document text
    • http://jolanyee.com/upload/files/202109141027519656.pdfIn PDF document text
    • http://charugarware.com/DEVELOPMENT/charu_garware/uploaded/userfiles/file/28590636448.pdfIn PDF document text
    • http://hgbs.de/userfiles/file/17926606924.pdfIn PDF document text
    • https://www.spitalmoldovanoua.ro/ckfinder/userfiles/files/giruvonafewivefigisagemit.pdfIn PDF document text
    • https://sacc-la-chaux-de-fonds.ch/fichiers/file/90210448472.pdfIn PDF document text
    • https://granitnet.hu/editor_up/70890921622.pdfIn PDF document text
    • http://tzsunup.com/upload/49820066769.pdfIn PDF document text
    • https://seeandhearbetter.ie/img/shop/contents/91150406068.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/p4f5fhda62b36pb3r9ijukkflu/4837406172.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143a55a54cdf---rabafidiw.pdfIn PDF document text
    • https://jnnjhansi.com/userfiles/file/40921861987.pdfIn PDF document text
    • http://budka39.ru/files/takasonuwetirabovopovazeg.pdfIn PDF document text
    • http://radioevangilereal.com/assets/ckfinder/core/connector/php/uploads/files/21607974790.pdfIn PDF document text
    • http://casaatlantida.com/userfiles/file///vogemodibive.pdfIn PDF document text
    • https://evpersoneli.net/ev-personeli/file/jokajoroxuxanip.pdfIn PDF document text
    • https://tidurmalam.com/contents/files/13943740019.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/xazopogef.pdfIn PDF document text
    • http://chamdure.com/DATA/files/65520539101.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161403f7937cb7---tajafigovejitepi.pdfIn PDF document text
    • http://woodlander.sk/grafika/file/97932961210.pdfIn PDF document text
    • http://mai-colle.jp/userfiles/file/goxozedi.pdfIn PDF document text
    • http://clubmaniacr.com/campannas/file/82466429782.pdfIn PDF document text
    • http://ticketsperiodico.com/galeria/files/91343177042.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=play+store+downloaderPDF 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_off0000cc4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC4F 16560 bytes
SHA-256: 4dcaad08ce41c683542e7c258bd5aeb45fc890d6fef30c3196b9f5a8f242ec2c
font_01_sfnt_off0000f6a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010eba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EBA 10352 bytes
SHA-256: a298a5864ef27c75c2becd8c26f38038b9feb691849f9093c9c5634e60275bb2