Malicious PDF — malware analysis report

Static analysis result for SHA-256 6885db218063a97b…

MALICIOUS

PDF

86.3 KB Created: 2021-08-01 04:17:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 50276e8eb0dcfc24af312fdd36aaba00 SHA-1: 2ae8cef1152adb23accee4cd04b98e49b276a2af SHA-256: 6885db218063a97b49b46c786d8af14b66994cfa4dc278b7064d9d509abdff16
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of external links, many of which point to compromised WordPress sites. The ML classifier strongly indicated maliciousness, and the structure suggests a link farm designed to redirect users. While no scripts were explicitly extracted, the PDF format can embed JavaScript, which could be used to facilitate redirects or further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/bfd19f968b810fc1f178f5c208f0d871/5536754584.pdf In PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/4bficlqq7adkchk5tt15l20pag/87876635888.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609df628b2e07---61371443583.pdfIn PDF document text
    • http://ks4073.com/file_media/file_image/file/dipedubinulazafogigijiw.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/91646432321.pdfIn PDF document text
    • http://viral-list-machine.com/ckfinder/userfiles/publics/files/boralezubi.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160725991bb978---64276116886.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e2fc9424415---bitubo.pdfIn PDF document text
    • http://naturallabs.fr/userfiles/file/69321079673.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3c09a303a---xubodatuwerukopotalilufu.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/9176145516.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca06bd494d---jeravotudixilatadafozov.pdfIn PDF document text
    • http://megat.pl/uploaded/fck_files/file/juxikiwumefakuxox.pdfIn PDF document text
    • http://stardentalcare.org/userfiles/file/vinal.pdfIn PDF document text
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/d6c09f6650dcd59f15ddb0726cd32f41/57930585761.pdfIn PDF document text
    • http://mosjob.ru/images/file/xumag.pdfIn PDF document text
    • http://aescantabria.es/upload/fckeditor/file///reponijoguluzavadotunim.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/5dc8f55e9cfaff90f3e14cb40829dfbc/rosore.pdfIn PDF document text
    • https://irantruck.ir/data/file/wubetedelilane.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609c30852e162---giwisokurogus.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/4cqf14n07025eu3qn13vkcv8to/33197620539.pdfIn PDF document text
    • http://www.libroparlatolions.it/backoffice/ckfinder/userfiles/files/37690130410.pdfIn PDF document text
    • http://activesolutionelectric.com/images/file/begiwoxid.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160828fdd58197---pamososerizitubupel.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc008313543---momorakulozizedibevoxeb.pdfIn PDF document text
    • http://partner-support.net/user_data/userfiles/files/89560040725.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=commonly+confused+and+misused+words+answer+keyPDF 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_off0000ecbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECBB 17412 bytes
SHA-256: 893fe0286c0c194153651b9d103578a392b278628e6273b37611178588d28044
font_01_sfnt_off0001198f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1198F 10960 bytes
SHA-256: 295d87fa41ff2517539da214a551bda87fc938b0d8685f2cfb5c9ba53f9bae10
font_02_sfnt_off0001330f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1330F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1