Malicious PDF — malware analysis report

Static analysis result for SHA-256 3205c1fb386cd0bf…

MALICIOUS

PDF

89.3 KB Created: 2021-07-19 22:18:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a677a757e8fa2acd725290d6d9705422 SHA-1: 2183c970263a4e4c7cc2722f7ab4359d6263e7d4 SHA-256: 3205c1fb386cd0bf581a42c2767d76d2521a2472d1966699137a84b56b76d44b
156 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised WordPress upload storage and other disposable hosting sites, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. The file's structure and embedded links align with techniques used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc5991b66b2---44105231225.pdf
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a45d5885230---fizipabagodupajox.pdf
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607cf6b63b9d9---70048556516.pdf
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/0c439e4d0b1fba2874ab86c0492ed504/nusidobixemumepiga.pdf
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1608ab53195de9---sadikari.pdf
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/e194edc6597082b0871be6575ae14cf0/bawuzugegutegot.pdf
    • http://thelewisfamilyreunion.com/clients/c/ce/ce72a6ed4f7059d305e3bbfb121cee90/File/mojunakeke.pdf
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609841a142572---8591566028.pdf
    • http://dgxzz.com/uploadfile/file/dixejojezujaxedivetibuxo.pdf
    • https://pnp-studio.com/fckeditorfiles/file/79874889693.pdf
    • http://nawooelcs.com/upload/userfiles/2021/06/files/210602073729.pdf
    • https://bursac.net/userfiles/file/21969245605.pdf
    • https://mondialardesia.it/file/pewajofakar.pdf
    • http://eastbrunswickliving.com/clients/77672/File/lunotutidok.pdf
    • https://dukra.sk/editor_uploads/files/nekalul.pdf
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/pimbdav494779kjkr5h87t3c74/70937642903.pdf
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/fcd1898ac4cfdcd39fedee1abad7f119/91050574777.pdf
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/70k9j616iif3prrf3unmb8td42/pinimajazanaze.pdf
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16094015a57289---3564660544.pdf
    • https://autoskola-scp.com/files/54605612866.pdf
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/ee2b732ba3f556542a658a5987a04244/37025192184.pdf
    • https://superpart.com/files/52099262340.pdf
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/b024a13d8a26b0346c4e6f1dfc4de45f/xaraleragewizexutu.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf4fa4e292f.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=5+differences+online+answers+level+14
    • 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_off0000f2be.bin
58e3874bba2c496b622579ecbaca40d4da9d5758831f08e1cf18b4780b971faf
pdf-font-stream PDF embedded font (sfnt) at offset 0xF2BE 20556 bytes
font_01_sfnt_off00012728.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12728 16792 bytes
font_02_sfnt_off00013f3f.bin
e65cfc8ce28442e7d47a0aa4a78e8179dff264768659de52861ba3ca71896009
pdf-font-stream PDF embedded font (sfnt) at offset 0x13F3F 10692 bytes