Malicious PDF — malware analysis report

Static analysis result for SHA-256 adc8ad60aad0ce53…

MALICIOUS

PDF

75.6 KB Created: 2021-10-04 02:20:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 3cda9755c24c2049b0252b4e3058fd3a SHA-1: 3cf36b92019e4427f2048a4ac3fc472ea11f96f5 SHA-256: adc8ad60aad0ce53a0da399de908cba0b727da10f9da13740aff5ba6e65f7ee0
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to compromised or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a non-clustered link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://ducthanggroup.com/webroot/img/files/zulofotelupaj.pdf In PDF document text
    • http://ecoaga.com/documentos/file/vasibiwizutewe.pdfIn PDF document text
    • http://professional-tuner.at/uploaded/file/98330363063.pdfIn PDF document text
    • https://ttablaksystem.hu/files/file/50074813935.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/tinepixukopovugosurevex.pdfIn PDF document text
    • https://cuacuonbentre.com/upload/files/vasoguzo.pdfIn PDF document text
    • https://telewebmarketing.com/FCKeditor/file/93829741303.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139301d0c7bc---55138638527.pdfIn PDF document text
    • https://arendic.cl/files/siwonobituguvasen.pdfIn PDF document text
    • http://mansiya.com/uploadfile/files/xopufogaz.pdfIn PDF document text
    • https://lesrimaudieres.com/images/uploads/file/65190127084.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/o4qdpe8pk01651472ps47acdv6/82402668601.pdfIn PDF document text
    • https://actsonics.com/uploads/files/202109231251516224.pdfIn PDF document text
    • http://di-tech.kr/fckeditor/userfiles/file/mugarojukomikukekew.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-10-1/20211001010741734264.pdfIn PDF document text
    • https://sokolzgierz.pl/web/uploads/files/nosazigipem.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/161595b69e52dd---52471541290.pdfIn PDF document text
    • http://digilit.ir/basefile/digilitir/files/56384081106.pdfIn PDF document text
    • https://dpengineerindia.com/admin/userfiles/file/6574000616.pdfIn PDF document text
    • http://goodwill.as/userfiles/file/vufamagerojawukawig.pdfIn PDF document text
    • http://studiomalpocher.it/userfiles/files/janozutote.pdfIn PDF document text
    • http://przyrodnik-kujawy.eu/userfiles/file/lavamojavosepovu.pdfIn PDF document text
    • http://ramenhajimetustin.com/uploads/files/xodurabukurupazoput.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/4804610542.pdfIn PDF document text
    • http://toroisg.com/public/images/files/vimorowato.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=2nd+puc+commerce+business+studies+notesPDF 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_off0000bdd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDD6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d5e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5E8 19288 bytes
SHA-256: a0e37022aa57282a931b491b9150dc498a23580921fe13880469265cd09ae12f
font_02_sfnt_off0001087e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1087E 10732 bytes
SHA-256: 86c5caf716b6db4c1b92285df14c1c366a036cf565227b21e1fdf0a25dac02ae

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