Malicious PDF — malware analysis report

Static analysis result for SHA-256 3017b8bf4f7ec680…

MALICIOUS

PDF

93.9 KB Created: 2021-07-01 15:06:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 2d6b22a8ba225b54d16a7d9c1a376164 SHA-1: f48d360236bc2889473ac6464da80b4de419f206 SHA-256: 3017b8bf4f7ec680173fcebc477ea48c640affc38ace92fcd7b6e1813b57e6e3
156 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which point to compromised WordPress sites and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware distribution sites. The primary attack pattern observed is the use of a link farm to obscure the ultimate destination and leverage compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

Heuristics 6

  • 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.
  • 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://businessservicesuk.com/userfiles/file/nodipuwevixugapulosejiju.pdf In PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/g0vo1m2iv10ktvt4iqru1grdgn/gejerupiferajiseluv.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa4f3ce2b78---46683604470.pdfIn PDF document text
    • http://vistobrasil.net/uploads/file/wedujutabuzevodin.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/320466e5f4b28280ec80de68b6678181/pevoxidijadoxegiguwowez.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/16079867e9298e---9855550941.pdfIn PDF document text
    • http://rocb-ap.org/file_media/file_image/file/jegoxejumadisorexe.pdfIn PDF document text
    • http://myjobcareer.net/userfiles/file/2021060902363473499.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1152b788e9---jipokuxetiwabivalaxa.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/7cc69c1d177484b773edc20419606280/79707319278.pdfIn PDF document text
    • http://autohondl.cz/userfiles/file/bekikigefoxululunisaze.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/601rsac4sfkkr5v36jho3qusf3/63719116165.pdfIn PDF document text
    • http://ufnk.fr/app/webroot/files/file/matufu.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/36dln7vjrmlam43hc60q6dif75/solelerulupagaz.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160d5778325907---11265492034.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/3f2d852a08fdabfa022ce66b78ec071d/79888234443.pdfIn PDF document text
    • http://innospectrum.eu/hirlevel/file/zenofuj.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/zogasogir.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ee2a51d9c0---bitufubekelusuwapigemur.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3c4ce49b8c---dunim.pdfIn PDF document text
    • http://vamaconsulting.sk/userfiles/file/midovitevalo.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021052706444385.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075e5276b878---80275062505.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160d207603afe4---45589136461.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b7fe319bb4a---mazinoborijurimobivezir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=the+notary+hotel+philadelphia+bed+bugsPDF 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_off00010867.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10867 18820 bytes
SHA-256: 1477fb7a5cea90cdc458056fff82dce6cc861c9ff2e8ac839223a40adb5952cd
font_01_sfnt_off000138b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138B7 10988 bytes
SHA-256: 1fb18ef474c1d142a48dc2eb2ef78b84606564916508b2c11f0f098a228559c5
font_02_sfnt_off000151b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x151B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1