Malicious PDF — malware analysis report

Static analysis result for SHA-256 df0043a73672af12…

MALICIOUS

PDF

68.4 KB Created: 2021-09-25 01:06:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: ffa00e644bd80b178fa4fd920c1e3841 SHA-1: def747b1f63da3585ba3bcc77c2e8bf6591da3cc SHA-256: df0043a73672af12e473081af4fe394c314394c178dc44af3f93a220ad04790c
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous external links, many pointing to compromised WordPress sites, suggesting a link farm or redirection scheme. The ML classifier strongly indicates maliciousness, and the presence of external URIs points towards potential phishing or malware distribution. No scripts were extracted, but the overall structure and URL patterns are indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://infrive.ru/uplcv?utm_term=talking+hank+apk PDF link annotation
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b0ddce29c0---nefob.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/7daef714e241df6b4d5e3b3f61842656/xewovezogitebi.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144a9e97317f---rugokapedunilogigabuka.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/161320573435f6---40811467094.pdfIn PDF document text
    • http://www.prodomasa.com/ckfinder/userfiles/files/jikabepabu.pdfIn PDF document text
    • http://cristal-in.fr/userfiles/file/nexuzogoto.pdfIn PDF document text
    • http://hemeringen.de/ckeditor_ablage/userfiles/files/nexopifopeworiluripufirax.pdfIn PDF document text
    • http://yongchengtech.com/uploads/files/202109071425104589.pdfIn PDF document text
    • http://jujucuisine.com/userfiles/file/90220708514.pdfIn PDF document text
    • http://dostrojar.sk/UserFiles/file/91155965672.pdfIn PDF document text
    • http://eska-lift.ru/userfiles/file/38786525735.pdfIn PDF document text
    • http://yuqiaohome.com/uploads/files/202109172230592735.pdfIn PDF document text
    • http://reversetheclocknow.com/ckfinder/userfiles/files/52278207796.pdfIn PDF document text
    • http://orderbestwings.com/uploads/files/bivikibagugadibovu.pdfIn PDF document text
    • https://equantumconsulting.com/files/files/xevigopifejexab.pdfIn PDF document text
    • http://babyindex.nl/images/uploads/rujopob.pdfIn PDF document text
    • http://xn--oy2b9bv81anouola.com/upload/file/202109242022587313.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/7eu3qdeldeh192aucifi1ku5jn/muliluxadaletavole.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///bubetoxafurixun.pdfIn PDF document text
    • http://flirdining.com/uploads/files/37328956218.pdfIn PDF document text
    • http://cke.hk/userfiles/rupunifo.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614146e5d6e78---95344013175.pdfIn PDF document text
    • https://www.lucaslobker.com/minor/ckfinder/userfiles/files/8777545809.pdfIn PDF document text
    • http://splhardware.com/UploadFile/file/2021091516115173499.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16140b14a9fb9f---18000315241.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_off0000b171.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB171 9968 bytes
SHA-256: 43aa035b07ff4060e38ccbf846f3352b73ee003065d9b8ac01764320d91ac3cf
font_01_sfnt_off0000c757.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC757 15196 bytes
SHA-256: d5d2a037a22cb7ac0748d6757f6faae25e9b202df3a01ef4bbb1fe58c2c6b267
font_02_sfnt_off0000ec8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC8B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1