Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff29f9736e9c7cbe…

MALICIOUS

PDF

89.3 KB Created: 2021-06-29 07:19:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5aba722046504729a0949b349e3803b8 SHA-1: ff70ff32112fec0d45580f407a1a6e648982cf17 SHA-256: ff29f9736e9c7cbe7477341fda73a8c06b586195631896ba54c5738a00bc93a1
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external websites hosted on compromised CMS uploads and disposable domains. The embedded URLs suggest an attempt to distribute further malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/e680de4b824f8e53802e0e6485c78011/23630601863.pdf
    • http://cdwy028.com/uploadfile/file/20210602185712.pdf
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/baqv2e56gcgc05f95a8993kak0/65077942415.pdf
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074533809e93---tizejixifemigusajanebeban.pdf
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/16091e888936b6---7941041380.pdf
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606ec7036c381---27408121496.pdf
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/h7vmom4s9v13l8s04j9mun75e0/lazadajuzokijebagipaga.pdf
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/9809b1c6c185e692f860adaba51d6b01/mevataroloburimovawaw.pdf
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607e8f934d4a3---lasaxarimewodolesobul.pdf
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608178ca31c70---rogifagoroburisofezu.pdf
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dc74da94f8---rojotubaj.pdf
    • http://dragonera.cn/admin/userfiles/file/21038395985.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608831fa5122e---dixinof.pdf
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7145a5585d---32502544254.pdf
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609b4cfe7f412---vosuwutug.pdf
    • http://tokstar.com/_UploadFile/Images/file/73722336154.pdf
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/10c914b0bb84c7b6eaa262de79861b04/48924502561.pdf
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/lu525pqotirqvugbita708tsmk/8264179055.pdf
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/4ef98103cec0030e9b4429197ada975d/84112350576.pdf
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6dabeda108---64266862287.pdf
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/30f85b80414661c74cc8d32ad023a0ed/zamitu.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b978fe01c90---19812863271.pdf
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/dbd6115bd126e1140ad094757df40392/vajewis.pdf
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607f16971f50e---32239696513.pdf
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d8ea919672---tozexakeberoxerosumajex.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=remove+stashed+changes+git
    • 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_off0000f8df.bin
85c0d8e68f25efa7a2ee013e1b1e865f9d2b2c80c0ac0bcc960fe1187afebfea
pdf-font-stream PDF embedded font (sfnt) at offset 0xF8DF 10784 bytes
font_01_sfnt_off00011162.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11162 16792 bytes
font_02_sfnt_off00012974.bin
03b3d7cd81640fd8a54d7bedafd36e84f636658d1d95a48e8d3343af3942dca8
pdf-font-stream PDF embedded font (sfnt) at offset 0x12974 17960 bytes