Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc7251f2a3e469d4…

MALICIOUS

PDF

82.6 KB Created: 2021-07-27 23:32:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3f4f23bef6404a09c4d8a512d2007fe3 SHA-1: 4f6494d8181ee41107a9220ae8559d8a1dda9cf5 SHA-256: fc7251f2a3e469d492abfa108cfaff1c76429cd220ac295cc31fca40eaf5eaaf
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to external websites, many of which are hosted on compromised WordPress sites, suggesting a link farm or redirection scheme. The presence of 'invoice' or 'payment' language, combined with the high number of external links, indicates a phishing or malware distribution attempt. ClamAV detection and ML classification further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/160b428e70a304---80989108274.pdf
    • http://dzbnf.com/upload/file///mujelerutorogivub.pdf
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/98b1eba83d0e8052cabffd72db047616/xavakule.pdf
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/a7486cd1e49365ad507c70088dad8379/41470114466.pdf
    • http://transsnabstroy.com/userfiles/file/sakol.pdf
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096f878277b6---fijuvo.pdf
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/c6389a050538b4516cc1a27a4d4c7838/85465252724.pdf
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/05ec1517ea6f91ae81be952171570aab/39588672934.pdf
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/2d450abffebfbdcc6091f95c477ffed6/menosumow.pdf
    • http://quickvideo.nl/userfiles/file/nopagisise.pdf
    • http://hodgesmageefamilyreunion.com/clients/c/c9/c95619ca3ec29dd030dc8935b97378d4/File/32341939886.pdf
    • https://sieuthimaytinhcu.vn/upload/files/begomeferoxekom.pdf
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/kjr8774p5ufvok3j8ubqdpda4a/52755357067.pdf
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16085235226cb8---wibijofavovexot.pdf
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1608a7ae0ec097---71993583865.pdf
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/5ddaf2af34cb521516b69330b503d240/17652501562.pdf
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/5d2bbce7bca33dee107a03bc55293bea/funuzutep.pdf
    • https://jf-orvalho.pt/userfiles/file/mojaposu.pdf
    • https://floresdeserrezuela.com/aym_image/files/16196974156.pdf
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606caf401b0ba---44990031130.pdf
    • https://ctapigroup3.com/contents//files/xoxibemimi.pdf
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/itb2ml48ja79mbj42ar3c1rij3/sapoteresesawotinuviwaz.pdf
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/b801f3e7f59422aaaacf3c1ada9ed9ff/47320449399.pdf
    • http://pelesiuvalymas.lt/i/File/sajexekozazonavipokomu.pdf
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160972d6f3aea6---65168934918.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+write+a+receipt+for+private+car+sale
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e06e.bin
64f8b4d130630711e432c102051dfcfbef3798898228ea02b2292bfacae6e5fa
pdf-font-stream PDF embedded font (sfnt) at offset 0xE06E 10512 bytes
font_01_sfnt_off0000f888.bin
7087c86f838db9e543a89abdc931b5f4d2b42a265e6d4231d7c9add258f273a0
pdf-font-stream PDF embedded font (sfnt) at offset 0xF888 16196 bytes
font_02_sfnt_off00012263.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12263 16792 bytes