Malicious PDF — malware analysis report

Static analysis result for SHA-256 652c3482e98c4c0e…

MALICIOUS

PDF

94.2 KB Created: 2021-07-05 15:55:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: ed8f8b8403e08a485accd3e737d0e50d SHA-1: 100342c76ddbd3c10f4c6a63d6a921f7aaee05ca SHA-256: 652c3482e98c4c0e67344be01a87e4d2946fe6dca48f0e1ac59ae6269bc15939
96 Risk Score

Malware Insights

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

The PDF contains a large number of external URIs, many of which point to compromised CMS upload directories. The ML classifier strongly indicated maliciousness, and the heuristics suggest this PDF is a link farm designed to redirect users to potentially malicious sites. The document body is heavily obfuscated and appears to be metadata from the wkhtmltopdf tool rather than user-readable content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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://drafthe.ru/uplcv?utm_term=stanley+and+the+book+of+everything PDF link annotation
    • http://thietbianninh188.com/uploads/files/37025186649.pdfIn PDF document text
    • http://xn--d1achljw0b.xn--p1ai/content/upload/pexofemirosanakoxinumoxeg.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/888ab89a514c8466c0d7f08e01e2c0c8/samat.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/gqgmu83mkradvjhed4dm65ol82/84625159655.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d7a38b6971---26481318060.pdfIn PDF document text
    • http://zelene-centrum.cz/webpagebuilder/ckfinder/userfiles/files/13921051725.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/760b69d3960bf4b83f03a1cc1979ddf2/wufijasan.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc43702bee7---xugakigirotutovopof.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9ce1e4a581---lazudakejerukufolume.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7edeb1b669---22999222224.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/6d3023ccc67c77e6998c844bb9c35807/wexuriko.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/6s6u5chb5gjjnajnmmlv32t6k0/xeponugegubeja.pdfIn PDF document text
    • http://jpind.pl/userfiles/file/46688244340.pdfIn PDF document text
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8725e0088---70742035502.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/71cb7d5b708b1314c857a11037701c74/xegeduvukorodisubeganidar.pdfIn PDF document text
    • http://shipagents.nl/uploadfiles/file/gafubodibikekuxab.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/basovidivajoxagog.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606e36a582845---37948665001.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607d45d8e5d5e---63724539045.pdfIn PDF document text
    • http://igabana.com/upfolder/e/files/20210623030443.pdfIn PDF document text
    • http://medicare-darmstadt.de/bilder/UserImages/file/27359959630.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160986158ad0e3---44727336668.pdfIn PDF document text
    • http://kimbuunguyen.com/uploads/userfiles/file/54123935757.pdfIn PDF document text
    • http://geneolock.com/locktactyuma/userfiles/file/gitefekikevovemuwo.pdfIn PDF document text
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/aaae74b4acf7b7177d68887992ebd87f/82078792904.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/16187078916.pdfIn PDF document text
    • 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_off00010db1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DB1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000125c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125C3 17104 bytes
SHA-256: ed8b8e4df50acea1cb5c91e66316667e42ac7b276eabe99df90811ba290f6ef6
font_02_sfnt_off00015257.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15257 10952 bytes
SHA-256: b36d748771efb3f4815c2c69cde055ad99dda27cf5116b703446bd2cd264ce00

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