Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4aee6c07a2e39ac…

MALICIOUS

PDF

144.8 KB Created: 2021-06-27 16:14:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e1c25a9b243091f80c6ebec41a9d9223 SHA-1: 20c22ba72681d6c6133f9eb7c3ec1c134de51ed7 SHA-256: d4aee6c07a2e39ac4a92af0154028b9713387494468b2c03ece53cb9e5c9488b
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier, indicating a phishing or malware distribution intent. It functions as a link farm, with numerous embedded URLs pointing to compromised websites and potentially malicious PDF files. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests these links are designed for SEO manipulation or to obscure the true destination, while 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' indicates the use of compromised content management systems for hosting. The document body is unreadable, but the presence of these link farms strongly suggests a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8107

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://celebicatering.com/upload/ckfinder/files/48339859298.pdf
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/793b8e417dba654757343a55be6bab96/kesojaraxipezijutujejodij.pdf
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077ec05a42f2---juwivatedipubifezeva.pdf
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/0injr5lchi4r2envd4p425b0eu/14686451120.pdf
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097c2cac5576---14048451838.pdf
    • https://mangmalungtea.com/userfiles/file/loxorazegexumugi.pdf
    • http://crmloccitanecr.com/campannas/file/29646871838.pdf
    • http://bobas24.pl/Upload/file/8749837107.pdf
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16087f5d821fe5---dezaseximaxow.pdf
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160d07ee2a9352---dufirase.pdf
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607307ea6c75e---disazi.pdf
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16075c6bc1444d---44856188004.pdf
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609472cba2635---visaruga.pdf
    • http://www.deep2001.com/images/library/File/wixujejibumometixejapitek.pdf
    • https://synersys.fr/contenu/file/83042051756.pdf
    • http://gleneaglehoa.org/images/file/loxemojujufudalebigemi.pdf
    • https://harkakotony.hu/UserFiles/file/1536098913.pdf
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b2e73addf1e---31720383970.pdf
    • https://www.vbclighting.com/wp-content/plugins/super-forms/uploads/php/files/173ddb56b4bf46fd4e372ec17461da31/wenelasirilivi.pdf
    • http://x04ydivan.ru/userfiles/file/rifow.pdf
    • https://alamansyria.com/userfiles/file/99939448230.pdf
    • http://jnnycc.org/userfiles/file/95503618863.pdf
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079963803a46---91996524437.pdf
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b8796232db---33210589316.pdf
    • http://www.sport-konyv.hu/userfiles/file/luvetevezosi.pdf
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085265716cac---kowitelevibazap.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=ideal+imax+w80+installation+manual
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d504.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD504 16792 bytes
font_01_sfnt_off0000ed16.bin
474bc7fce49e4d9f623973404864582c8d7cc7645871c58886eadfddc111f425		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED16 16236 bytes
font_02_sfnt_off0001174f.bin
913c9ce91f63aa9811ec013d01449fcf552681ac2cf545d05421fe0eb59abe7d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1174F 16264 bytes
font_03_sfnt_off00012d44.bin
e99560d150baa0e6ce218056755184ee555a507e5d4f8131b800b550ef3b1350		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12D44 91048 bytes
font_04_sfnt_off0002194d.bin
9f99a3970defa8bc46b7507e563173e8fae8682710d22a237566e57d99bf21ab		 pdf-font-stream PDF embedded font (sfnt) at offset 0x2194D 10880 bytes

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