Malicious PDF — malware analysis report

Static analysis result for SHA-256 e02f7920743ef360…

MALICIOUS

PDF

85.5 KB Created: 2021-08-18 04:41:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 3d1edb995bee108191777b30c740dad1 SHA-1: 367d8009ea56a4d40aa714b34f4930f91abb7398 SHA-256: e02f7920743ef360ae4480b0fc464727b32a04baa2c5a09de31fa77eb8982c11
96 Risk Score

Malware Insights

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

The PDF document contains a link farm pointing to multiple compromised WordPress sites, indicating an attempt to distribute malicious content or phish users. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent. No scripts were extracted, and the document body was unreadable, so the primary attack vector appears to be the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/7f6934f856a656e2a56987704efdee63/4450628110.pdf In PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c14b3f97397---78483347280.pdfIn PDF document text
    • http://jp-cable.com/d/files/1861648783.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/95djfkskediglsarp9gus9jcbj/nejoturigitazoje.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/torutizenubop.pdfIn PDF document text
    • http://sushimura1.com/uploads/files/44521885758.pdfIn PDF document text
    • http://sungwoneng.com/upfile_editor/2021/files/27131990383.pdfIn PDF document text
    • https://binarbaidrealestate.com/public_html/userfiles/file/popodusukokotaz.pdfIn PDF document text
    • http://weingut-suppan.at/files/kululogisal.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e5a7eb200a3---24271771781.pdfIn PDF document text
    • http://asu78.ru/userfiles/file/mulatosijijen.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/ctv21ts06f598mo31o2mmkbv22/96204432925.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bce1b28cc4e---22860712859.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/2us1rj48hfu2ddjn9lr32v9lja/4230008000.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/97338060032.pdfIn PDF document text
    • http://rivucota.com/upload/files/67664371662.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097026529ddc---3238592648.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/c1e88fea73396c0b6f27a7a46aa91535/zufixakexolugumofaki.pdfIn PDF document text
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/807efdc5bd728f7d9ee98e437ac9d425/58484716876.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160792d4c43546---kivodunexerexutaza.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160a250fb945c7---93390223068.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/dalomu.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/zonovufesupizi.pdfIn PDF document text
    • http://ricarda-allegra.de/userfiles/file/nixupokuranor.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=what+does+it+mean+if+you+smell+like+maple+syrupPDF 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_off0000e769.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE769 11064 bytes
SHA-256: 7b5b676cdd5fb15a26c7c680f12e294563f575788914caa8d38a5e19a8460d44
font_01_sfnt_off000100fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100FC 17428 bytes
SHA-256: 14eb5a3deb3121c59eaa72642db3394ee1d1236158e260ab03c0bb2615f7c7d4
font_02_sfnt_off00012ed7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ED7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1