Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebc830fa89c0d084…

MALICIOUS

PDF

89.3 KB Created: 2021-07-27 15:41:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b96380f0b9a31b2bd0b45d64d1979797 SHA-1: 14c4b0f50c1e4887bf728724bcd13c00831b0218 SHA-256: ebc830fa89c0d084b70f39cb01f34f0de8a9336e531b8e2feb11668ff946d7d8
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to websites that appear to be compromised, with many hosted on WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the heuristic findings and URL analysis confirm its function as a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092fd57aa248---20883533431.pdf In PDF document text
    • http://heaig.org/editor/ckfinder/userfiles/files/xugaxudonopotijesozisezek.pdfIn PDF document text
    • https://bikidi.com/UpFiles/WebEditorFiles/file/49242748910.pdfIn PDF document text
    • https://gtselect.fr/ckfinder/userfiles/files/41110617001.pdfIn PDF document text
    • http://cloverpark1961.com/clients/6/6a/6a73a08bb68f643008adb5efbbb44e43/File/41195360384.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/oe5e69b7pr0sarj396ei4ku43a/79956745993.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607c1c54313c9---67603379017.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/833e556ed2150d5a1a0bc9fd9d5d4a57/98217346401.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/2ba596499bdb3db10363f856a24c4b6f/lujopasegizigiv.pdfIn PDF document text
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/21388e3badf60f7abe0917908aa8e335/sedelajerojalanulejaxago.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/gubutejufexaliperuwadener.pdfIn PDF document text
    • http://rollfactorytogo.com/uploads/files/1980521232.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/3804658035.pdfIn PDF document text
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f7a138ca30---4977363225.pdfIn PDF document text
    • http://candleelectricals.com/uploaded_files/userfiles/files/83064076541.pdfIn PDF document text
    • http://carsonpokebar.com/uploads/files/tarafipirupimekapudivate.pdfIn PDF document text
    • http://exosportsante.fr/ckfinder/userfiles/files/74494213575.pdfIn PDF document text
    • http://buchtel1967.com/clients/26382/File/41054352905.pdfIn PDF document text
    • https://ntct.dz/ckfinder/userfiles/files/totulimozim.pdfIn PDF document text
    • http://stalmost.pl/userfiles/file/mivikoziwulexinowipa.pdfIn PDF document text
    • https://bonpetsupply.com/wp-content/plugins/formcraft/file-upload/server/content/files/160854461065db---2198996740.pdfIn PDF document text
    • https://rocksoliddesigns.biz/userfiles/file/zozipetesusiruso.pdfIn PDF document text
    • https://gamaconsultores.cl/upload/file/fosimud.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/7bc5aa773b92841b5f9694efaeab140e/xarexonoja.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=free+call+recording+app+for+iphone+quoraPDF link annotation
    • 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_off0000fa8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA8F 10856 bytes
SHA-256: b7befbbf86ee09648a302c073dc42ff0621849865a24f2a14fc0282cec18a503
font_01_sfnt_off000112e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112E3 16652 bytes
SHA-256: a6e38af4f71d72bbdcdc1bcb85bb201442513a15e2683f1baf62dd3942bf73dc
font_02_sfnt_off00013e36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E36 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1