Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa23506fe937707a…

MALICIOUS

PDF

88.1 KB Created: 2021-07-21 14:48:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: a43dc4ed5d6c40eb8bcaacf7306e87ac SHA-1: b46d312a5c7143bd2276f9583bfcd2a30d1fd835 SHA-256: fa23506fe937707a51d235cb9fe55f38f5a185f088b73fe442bb290d5d5fe1cf
164 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised WordPress sites, suggesting a link farm designed to host malicious content. The presence of a 'download button' heuristic further supports the idea that this document is intended to trick users into downloading further malware. ClamAV detection as 'Pdf.Phishing.Trojan' strongly indicates a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/37e6eabb85ce351ca3a1556a43ef3c36/99762172846.pdf In PDF document text
    • http://fullcolorspandoeken.nl/userfiles/file/tuxigiduno.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/4hcpkg27lt20s4nvbcr108onn9/98531553128.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/61b1ce456617dcd3c32dbb7de539e545/80133666129.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/ik456gdeeu4j06utrdi3c0krh6/46823140502.pdfIn PDF document text
    • http://yizhu580.com/ckfinder/userfiles/files/fewolefoviw.pdfIn PDF document text
    • http://pampa.be/uploads/userfiles/files/xolipepipa.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/1311af0917d742535930a52b940dd5f8/31876791774.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/0d97777aa56750c2926271571a66d92c/38219030766.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160877dcc806bf---81176145184.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/8d83a612838393fb1b4593c26408c130/49233518196.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/7885cd2c75739afb3dd96fcbee57a50c/goseloperofasewar.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/6de38b9172b62f47c94b5710ef279f3e/muxawukexikawolez.pdfIn PDF document text
    • http://walkercombsfamilyreunion.com/clients/d/df/dfd517ab040340b2551da60fba195f5f/File/luvokek.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb60548c089---61531569371.pdfIn PDF document text
    • https://goodline.by/userfiles/file/vedepode.pdfIn PDF document text
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/a2aadc04f112b0e0e3fd1f1ea059085f/98461204774.pdfIn PDF document text
    • https://tidurmalam.com/contents//files/timanusolalobemebu.pdfIn PDF document text
    • https://baoyi-chuck.com/ckfinder/userfiles/files/xiwitobogawowiwo.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dfbf5f2063---72711962113.pdfIn PDF document text
    • https://roweryelectra.eu/app/webroot/uploads/file/16242001275807.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1607548cc4938f---virojaxapite.pdfIn PDF document text
    • http://mai-colle.jp/userfiles/file/fakotizepojo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=product+key+to+activate+windows+10+pro+freePDF 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_off0000f3f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F0 11200 bytes
SHA-256: 32f231fd967fb7252f598f3a7fa5f293dc7b2e2313d80a531176013a70d1bb12
font_01_sfnt_off00010e77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E77 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012689.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12689 16508 bytes
SHA-256: f7b3977dd808e8a65ee4d4b99249cc7a9b1a0499990eec51f2c2ae1dc11ebe9f