Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bf7dedb10a16cda…

MALICIOUS

PDF

95.7 KB Created: 2021-06-29 21:17:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 80439ae9d7401c7bd68d745d9f1ce26b SHA-1: ac849c98a807a97b6c27908d77d474e1de6cbe5b SHA-256: 7bf7dedb10a16cda8a85305d894f770e9b2a430fe5e007691b3750093167af7f
96 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable domains, suggesting a link farm or redirection scheme. The ML classifier strongly indicates maliciousness, and the presence of external URIs and link farms points towards an attempt to drive traffic or host malicious content. No scripts were extracted, limiting the analysis of direct execution vectors.

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://garglob.ru/uplcv?utm_term=low+rpm+idle PDF link annotation
    • http://dochoiotovn.com/uploads/userfiles/file/10946911724.pdfIn PDF document text
    • https://aterhesseg.com/up_image/file/29683997771.pdfIn PDF document text
    • http://beerskiboot.com/img/upload/file/tusawokegazegitamumuve.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1608095db34e18---4076888852.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf0c4099781---bopegawesukuwusilufu.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/gokisegeluvibosif.pdfIn PDF document text
    • https://bodegoncriollo.com/userfiles/file/zimizariginubonavarut.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607239f462f3e---narevik.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021062302421968.pdfIn PDF document text
    • https://cr2tek.com/userfiles/Proj_Name//files/gijuzokudupelosesonumisex.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/9di2idn6jkj9d7sfg12mfvoilb/25512426710.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b1d2ce87290---fumoxajigide.pdfIn PDF document text
    • http://glotecgh.com/upload/editor/file/2443380025.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160798a0a74015---70281278123.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/5e412e6cce27b9bfb9f4d1a26a28ab1b/rerobizuwaduvimarig.pdfIn PDF document text
    • http://sun-eko.eu/files/file/jobozewidibulixewumumot.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607550572b25b---40864025315.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076f7e51fd29---xatozemi.pdfIn PDF document text
    • https://aslimitada.com/userfiles/file/jifekotokim.pdfIn PDF document text
    • http://93564497.com/userfiles/42568099782.pdfIn PDF document text
    • http://barcelonasixtytwo.com/userfiles/file/48877165432.pdfIn PDF document text
    • http://posekatzahradu.cz/files/file/12899123143.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a303469c4dd---27282527282.pdfIn PDF document text
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/a9282b84ebd095a54676aac57b98c06d/58114930599.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e3685cca63---lerokogexurusikefet.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/jc3jrn2i7m99ua8gchh1kub372/7189993100.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_off000116db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116DB 16984 bytes
SHA-256: 9854b1fdeb794ab5cc4dbceb67286916afdee41d8a52a1ee0ac26630734f1ec3
font_01_sfnt_off0001433f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1433F 10064 bytes
SHA-256: 79a80bf55152627871bdc674ca652f5c9f8e52a2a63062c449c5562d53209b66
font_02_sfnt_off00015994.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15994 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1