Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f8e61808e9fdae5…

MALICIOUS

PDF

87.9 KB Created: 2021-08-04 06:21:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 967bbd7531c72298c5f353a6c656a375 SHA-1: 290a12df92cf111ec428e8f6d7008c2bdd1bacc0 SHA-256: 7f8e61808e9fdae5b655c028dc934f1c38693f06d73da63fa564541470c699de
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://banlinhkienlaptop.com/userfiles/file/83362915192.pdf
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/48frqvu3she7m4jvtdeif97ipg/jesoxijoregotelipugijewa.pdf
    • http://buzmakov-ua.ru/admin/ckfinder/userfiles/files/somuruxarasupupad.pdf
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16079b0bf10487---nuroligadudamomodas.pdf
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba8856cce20---delakilanenerajan.pdf
    • https://sasalidayanisma.org/uploads/file/24462041352.pdf
    • http://ledson.ru/upload_picture/muwaz.pdf
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1607e5eea2550f---21031089459.pdf
    • http://webbuilders.com/files/file/nulodebavunalezovatet.pdf
    • http://abwplazaview.com/uploads/files/28648602578.pdf
    • https://agentcctv.com/userfiles/file/nomebomazunikag.pdf
    • http://gzmzwl.com/Uploadfiles/files/53150334807.pdf
    • http://www.oe.com.tw/ezadmin/ckfinder/userfiles/files/wukewoka.pdf
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/160928a8938c65---16071322729.pdf
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/4c886b1ac654fdbf07f52b2878ef364c/bibufemosov.pdf
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075b21f1392f---gasidatomosex.pdf
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/32420c9814e8751540e25c84f0afb80e/79770654391.pdf
    • http://kondicionery-ivanteevka.ru/upload_picture/file/zarubinexo.pdf
    • https://areicon.com/images/file/76630811376.pdf
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/16070b1d48d2e6---jimoxadagizugu.pdf
    • http://thietkewebbacninh.com/webroot/img/files/16277507936.pdf
    • https://history.tlshaa.org.tw/ckfinder/userfiles/files/xozosipusezokipofake.pdf
    • http://vankouwenenmastop.nl/UserFiles/file/2293275933.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=king+root+apk+download+latest+version+2020
    • 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_off0000f24c.bin
11819c332c1a63dacd87b80b10f9997e58368762d83e064c182a184c8cb9aa97
pdf-font-stream PDF embedded font (sfnt) at offset 0xF24C 17376 bytes
font_01_sfnt_off00011ff0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11FF0 16792 bytes
font_02_sfnt_off00013807.bin
35fd8a5c177370c65840effb54e8ec0ce970d484b3828cb566d26ca56ad94229
pdf-font-stream PDF embedded font (sfnt) at offset 0x13807 11044 bytes