Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf33f0639ae312ba…

MALICIOUS

PDF

84.5 KB Created: 2021-09-01 00:10:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8a82fa072e605b2ae9d86b26acfda384 SHA-1: 05e08428124199f040a082da049bc20b027f0193 SHA-256: cf33f0639ae312ba299dcb71477d46c9ce965b53cdd25279cdf9b0b27c446de8
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, indicating a link farm designed to redirect users. The presence of a raw IP address in one of the URIs further suggests malicious intent. ClamAV detection as 'Pdf.Phishing.Trojan' and ML classification strongly support its malicious nature, likely serving as a lure for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/fnd16rqgriq15itqo99t81uhm7/99538269112.pdf In PDF document text
    • https://alutat.com/data/file/54143798795.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c9352b7e34---97840250530.pdfIn PDF document text
    • http://kedehg.com/ckfinder/userfiles/files/fofoxujamudopudokabanerer.pdfIn PDF document text
    • https://shreenathtechnologies.com/userfiles/file/xakeg.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/984b07e90df6357e9caf436148c849e3/konobuv.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/1609d5a5a03efb---25689088403.pdfPDF link annotation
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/4bemqvfkuunees2rat5l4prdr1/kowivipuwejuwukudaw.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160afb169017c2---23940445857.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/160ac351a6f9ee---bupawisitavipejezipakafup.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/e3a8da55c9363d7672e1fc266e54d14d/nuresebivosufajozedafe.pdfIn PDF document text
    • http://theclubburger.com/uploads/files/gaxaz.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/zudozifunonazuzexibeme.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/622796f688da42ce5d592f89fb10a228/soxixijejadujunofog.pdfIn PDF document text
    • http://skrabl.pl/www/rpbd/fck/file/46383833130.pdfIn PDF document text
    • http://robbes.nl/media/files/19599159401.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c757fcba81---soluta.pdfIn PDF document text
    • http://drukarnia-warszawa.pl/pliki/file/dugizipuware.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/050435422884.pdfIn PDF document text
    • http://domeinbeverdonk.be/assets/files/file/nawudozasananopebume.pdfIn PDF document text
    • https://qualityroofinnandsuites.com/nbloom/fckuploads/file/lopufukefifazov.pdfIn PDF document text
    • http://eachfun.com/ckfinder/userfiles/site_eachfun_com/files/xuginikabu.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082a2a256a74---wiwozog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=different+color+nails+on+each+fingerPDF 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_off0000e609.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE609 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE1B 17712 bytes
SHA-256: 86117c3cf29df6e1a5e09cb11881fdb15c9e0f9a80052d4b28ff3123a0b87f07
font_02_sfnt_off00012b64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B64 10616 bytes
SHA-256: 6b8dcd5ff277fb3f9c26ba08bb1db3d364aae8aaf1392c4d89a30575b483aeec