Malicious PDF — malware analysis report

Static analysis result for SHA-256 03848c26e8fe9750…

MALICIOUS

PDF

80.6 KB Created: 2021-09-07 22:32:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 0082bd18999a81191c8b69fcdd5e4910 SHA-1: 6527706f3cb3af2eadd5e5f28338b5655825db74 SHA-256: 03848c26e8fe97501d0d564f12e2ac9c14a90b29921fa71ed4c476ced667eca4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as a phishing trojan. It contains embedded JavaScript and a large number of external links, many of which point to compromised CMS upload directories or disposable hosting, indicating a likely attempt to redirect users to malicious content or download additional payloads. The presence of embedded JavaScript (T1059.007) further supports the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://medvor.ru/uplcv?utm_term=times+tables+worksheets+2 PDF link annotation
    • http://rgjbreunion.com/clients/6/69/6950e03db8b1ea894755b369f0a03c31/File/33020724749.pdfIn PDF document text
    • http://newgrids.com/userfiles/file/pejovajutumazilibowojoluw.pdfIn PDF document text
    • https://adtw1.com/ckfinder/userfiles/files/tadosotuwijeloporokogiru.pdfIn PDF document text
    • https://kirbas.com/img/uploaded/file/lepiwivalefiragaxini.pdfIn PDF document text
    • http://asea-admin.com/_userfiles/file/20210820011536.pdfIn PDF document text
    • http://ty6600.com/userfiles/file/36094498915.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607f1b5234bed---gupugujutavevoxonivatazu.pdfIn PDF document text
    • http://choinka4x4.org/cms/files/file/remododafefoduwavozaxik.pdfIn PDF document text
    • https://dynasty888.com/image/files/20210719_231826.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/a05c022c7d2257e7b562a24323a03e1e/gederomeg.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d882cd4d9b3---limovamot.pdfIn PDF document text
    • http://1137.jp/app/webroot/js/ckfinder/userfiles/files/90858994719.pdfIn PDF document text
    • https://gegeny.hu/uploads/file/xedusedorizibafezimotiv.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/c921ec9e5e34b6e26ca92b5412132ce0/71670059138.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/16079576f0c9d4---32488562092.pdfIn PDF document text
    • http://bjbtrh.com/files/pic/file/50969934011.pdfIn PDF document text
    • http://chono.mn/uploads/userfiles/files/fozemumafovizezi.pdfIn PDF document text
    • http://szyoujin.com/UploadFile/file/20210805051521870.pdfIn PDF document text
    • https://www.rekalibracija.com/wp-content/plugins/super-forms/uploads/php/files/dbef86b87d8163e4ed4646ca804439d9/vosidefatutilusijasemi.pdfIn PDF document text
    • https://dubaimotorcycletours.com/uploaded_images/files/garikepuf.pdfIn PDF document text
    • http://www.manorbymajor.com/userfiles/files/nixuzuzasidel.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a116bb5b748---58634167363.pdfIn PDF document text
    • http://baocaosudanang24h.com/uploads/image/files/tilalujizaxuzuxorivibilep.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/9233449364.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_off0000d7a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7A1 17332 bytes
SHA-256: b355cfe3b56f142e32a50f44e318fce6fdbfa6f5d4fa633d0a5f6dbd763d9279
font_01_sfnt_off00010454.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10454 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C6B 10668 bytes
SHA-256: 8bf9a47314bee65b4486adbe4d73a55f3b626e202a7ac274f1945766c23fd0f0

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