Malicious PDF — malware analysis report

Static analysis result for SHA-256 66b4f19b879e60d7…

MALICIOUS

PDF

74.3 KB Created: 2021-07-25 01:18:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 177f2062c2d782eee7dad720a92f4d8f SHA-1: 674fa674ff7d044d7f88233eb8d2604e60dacd02 SHA-256: 66b4f19b879e60d7233268a2e2a46e75d46adc7c0c644e601abd6c39b9903617
176 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating it's a link farm pointing to compromised websites, likely to host malicious files. The ClamAV detection and ML classifier strongly suggest malicious intent. The embedded URLs, particularly the IP literal, are highly suspicious and likely serve as download locations for second-stage malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://beliangka.com/contents//files/guwukut.pdf In PDF document text
    • http://xboxheerlen.nl/userfiles/file/64887308494.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/l50j4i7igssvi6o9siilp7mtu7/vemibaximakafad.pdfIn PDF document text
    • https://beaszemin.com/files/48504125808.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/q32tfkr9iel0dn5gq09koso5es/59133089128.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a14615e776c---dilevekarowujuxamipagezoj.pdfIn PDF document text
    • http://mail.me.ntou.edu.tw/ckfinder/userfiles/files/20210707_065314.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160787cbe3c3b0---werapimufopekotowub.pdfIn PDF document text
    • https://ip-pharma.net/data/files/42192871073.pdfIn PDF document text
    • http://jjkxmy.com/upload/files/202106160448477574.pdfIn PDF document text
    • https://greffedecheveux.center/upload/ckfinder/files/mazik.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16070695d59170---97165728450.pdfIn PDF document text
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/3e89d2517c9a28ea845c8a01e79aa1f6/65752899154.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b5f791ab313---vedapudifixijeforema.pdfIn PDF document text
    • https://rmp-traueranzeigen.de/cms/files/83287291136.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160c421f240629---xajid.pdfPDF link annotation
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/16091dbddc2711---davafozatovat.pdfIn PDF document text
    • http://bajajsports.com/userfiles/file/fukutiroxivawowilafativeb.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/784i21jh0fq52f8sdop5tpcth4/zazudijaresusaxexevobolof.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c62818199fd---lufiwudonopadanizuvi.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/b8627680bd1142b73c269d1e9b5d842b/36263297498.pdfIn PDF document text
    • http://www.microsinusectomi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a565d9f37b---86520913207.pdfIn PDF document text
    • http://bluefield1966.com/clients/26642/File/pirosi.pdfIn PDF document text
    • http://cupta.org/userfiles/files/20210619052037.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/5i5pf50mi1q1q18711ib2t5dp3/nuzotogotudegokomu.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/winiwezagomunuve.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=palme+ayt+kimya+soru+bankas%C4%B1+pdf+indirPDF 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_off0000bd35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD35 11152 bytes
SHA-256: 4ef35f36606fdc96e5aca63c44ac4ebc6ed5e8be50a4e78e4c62f3df4b8eab5b
font_01_sfnt_off0000d706.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD706 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ef18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF18 17500 bytes
SHA-256: 7e97357d9e8fa6f2052ffe42876813bc5785ca3e1ae00126d1d111c3bc32e31f

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