Malicious PDF — malware analysis report

Static analysis result for SHA-256 8eb4a99f3251d49f…

MALICIOUS

PDF

77.7 KB Created: 2021-09-07 17:22:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 47412ca8f5dd6b33a9e27f9bd09c9f2b SHA-1: 85c14ce3efb4b5790d7cfc7c6309d216e82b152f SHA-256: 8eb4a99f3251d49f999db9d8cfbf6f6c6529a8b3e9c55617bf8f18061fe5c3d3
96 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites. The ML classifier strongly flagged this PDF as malicious. The presence of numerous links to potentially compromised domains suggests a tactic to manipulate search engine rankings or to serve as a distribution point for further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 5

  • 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://space1500.com/wp-content/plugins/super-forms/uploads/php/files/6c115704f1a267a4d21c94178d191712/kipizajewuvitebabapoke.pdf In PDF document text
    • http://olgapolyakova.de/files/files/82838406580.pdfIn PDF document text
    • http://radtel-sport.pl/userfiles/file/xiwidakekulakugu.pdfIn PDF document text
    • https://soechi.net/userfiles/file/70725008197.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607570dfcb933---japulimuv.pdfIn PDF document text
    • https://lastcallslc.com/wp-content/plugins/super-forms/uploads/php/files/51fdd7e2f7ded39f3473ee4d64b75f41/bazadegeladavuneguzebopax.pdfIn PDF document text
    • https://p87.hu/files/20795737676.pdfIn PDF document text
    • http://robbinsfamilyhealthcare.com/clients/2/2c/2c787fa606fc56c3a3a24dfc5409695f/File/41958189741.pdfIn PDF document text
    • http://tienphat.vn/imagesflashupload/file/69370000152.pdfIn PDF document text
    • http://proximeo.com/ckfinder/userfiles/files/wasiwudamesukebesadufu.pdfIn PDF document text
    • http://szakkepzosiklos.hu/upload/file/rajabu.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098317293423---30956665750.pdfIn PDF document text
    • https://salvatoredivilio.it/userfiles/file/rugifali.pdfIn PDF document text
    • https://rasathantrananotech.com/ckfinder/userfiles/files/xilebixodutipimokeropo.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a340823e5d4---58191556045.pdfIn PDF document text
    • https://kimtuong.vn/isc/public/files/fckupload/file/21817395809.pdfIn PDF document text
    • http://okwmd.com/upload/fckeditor/file/50621335969.pdfIn PDF document text
    • http://clinical-pain.com/pds/userfiles/files/rujidelesilevinagi.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/29430942567.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/71823a436e5f3350f9b696b656726b22/tiginuxadajusujivufo.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/c2482lfrufqn5n0ons2bbo3e23/romelusuna.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611cf825bf41a---wadobemidapakogeji.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=a+dozen+a+day+book+1+pdf+freePDF 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_off0000ca77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA77 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e289.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE289 18080 bytes
SHA-256: 73444bb5d32f44982e794413f3587cb45944a801387989000a7b2c822e9a73c7
font_02_sfnt_off000111a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111A5 10528 bytes
SHA-256: dd5be0b223f37f097476604265aa8f5b1ba44ec96908c4feec361104b8529554