Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e7b7b3606a9be0c…

MALICIOUS

PDF

75.4 KB Created: 2021-09-21 23:20:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 902b2d8f4074ef2a7d786f3a88053603 SHA-1: ae44e33ea61f3a1748f5428fa576f63f56fb4ed2 SHA-256: 7e7b7b3606a9be0c918cb68c2e27d0ea75fbe2f606879915e87f493259b9b918
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains embedded JavaScript and a large number of external URIs, many of which point to compromised WordPress sites or are structured as link farms, suggesting an attempt to redirect users to malicious content. The presence of embedded JavaScript indicates a potential for further malicious actions beyond simple redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://inwebjor.ru/uplcv?utm_term=android+boot+animation PDF link annotation
    • http://webcertain.net/contentupload/fckeditorUploads/organization_/file/16224260752.pdfIn PDF document text
    • http://medicalproduct.hu/images/files/juwededavopuje.pdfIn PDF document text
    • http://fcgo.tw/uploadpic/files/ketuvavelazapijoxemijade.pdfIn PDF document text
    • https://digireg.li/upload/lagerefavezomadov.pdfIn PDF document text
    • http://laboratoriodiprogettazione-ve.it/userfiles/files/jefojopowe.pdfIn PDF document text
    • http://abnigakgdsg.friendship-match.com/upload/files/15015664380.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/16137aff735558---ketovebetadexa.pdfIn PDF document text
    • http://dylogistics.com/userData/board/file/tizipobajibateduvisasetob.pdfIn PDF document text
    • https://samavetpharm.com/userfiles/files/nuwuzoregu.pdfIn PDF document text
    • http://www.creativitaecomunicazione.it/js/lib/ckfinder/userfiles/files/55814910559.pdfIn PDF document text
    • http://immobilieninvestors.org/userfiles/file/87510406173.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/346f8512480a707ec1ec55e423e45adc/ralumabapuzawufilafip.pdfIn PDF document text
    • http://contextuae.com/resimler/files/53509366557.pdfIn PDF document text
    • http://xn--80affcyoc0ac1f6a.xn--p1ai/admin/modules/ckeditor/ckfinder/userfiles/files/94461682039.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/94494161184.pdfIn PDF document text
    • https://matfplayer.com/calisma2/files/uploads/ginurirojizotatemid.pdfIn PDF document text
    • http://a2kat.ru/userfiles/file/dofewubuwumazozum.pdfIn PDF document text
    • http://tarnava.eu/user_images/file/63270417066.pdfIn PDF document text
    • http://kxxbs.com/uploadfiles/file/a/6697199913.pdfIn PDF document text
    • http://tongshengchem.com/ckfinder/userfiles/files/wolawo.pdfIn PDF document text
    • http://jinwoosmc.com/userfiles/file/vexuvijen.pdfIn PDF document text
    • http://sualpturizm.com/userfiles/file/82827095113.pdfIn PDF document text
    • http://oecschool.com/userfiles/file/98031887060.pdfIn PDF document text
    • http://cold.lt/userfiles/file/zutegurefopag.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1614804c9bc858---nalonatux.pdfIn PDF document text
    • http://www.nbc.com.vn/ckfinder/userfiles/files/40495059384.pdfIn PDF document text
    • 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_off0000c5ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ddbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDBF 16796 bytes
SHA-256: ee5a4d878507d033c22b2dcf437c8c68fe0f618c3c6a3c84820f435ac8a3c12d
font_02_sfnt_off0001093a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1093A 10184 bytes
SHA-256: f186200d52068326ad9bc6434e5ff1e53525021853ee11b3a8e87c12360fce07

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