Malicious PDF — malware analysis report

Static analysis result for SHA-256 de6836690a1c3678…

MALICIOUS

PDF

547.7 KB Created: 2021-08-26 04:34:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 6295f559dcdee5d54c1c3c32723a80e4 SHA-1: e3d33dcb53999aa5fa9a2ccbc9af461a848b42c0 SHA-256: de6836690a1c367854ed6112eeb16a9f3203d202d6850a52b44e7c8292ccc1f9
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious Link

The PDF file contains numerous embedded URLs, with a critical heuristic identifying links pointing to compromised WordPress upload storage. This suggests the document is designed to redirect users to malicious content hosted on these compromised sites, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, limiting further analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier clean score 0.1399

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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 http://assistance.uz/images/shared/file/vubivovuxal.pdf In PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/ef17ec901672cd45f952eccdbeb81a8c/fopepiwozafutifusojividep.pdfIn PDF document text
    • https://babamore.com/upload/ckfinder_temp/files/20210601180336.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac6fc11003f---bevudas.pdfIn PDF document text
    • http://educasters.co/ckfinder/userfiles/files/bipepimevidonagiginobot.pdfIn PDF document text
    • https://burgas-remonti.com/userfiles/file/roragejosu.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/41ccab1d26a74049284795994a06b586/moxolidinamasimepulitasir.pdfIn PDF document text
    • https://divinenine.net/userfiles/file/xazomepepilalitexu.pdfIn PDF document text
    • https://gagiongvitgiong.com/ckfinder/userfiles/files/sekejivazekog.pdfIn PDF document text
    • https://tepihtrava.rs/files/96586595980.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16077b8d15c263---95280647477.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160dc0943e6898---valijinepowuvuxalebivapij.pdfIn PDF document text
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/57908952492.pdfIn PDF document text
    • http://toastwarenhuis.nl/app/webroot/files/userfiles/files/6789090407.pdfIn PDF document text
    • http://oprandi.it/userfiles/files/dilibejipagovidabe.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609522dcdb291---tanoxuj.pdfIn PDF document text
    • http://ruilong-ironwork.com/CKEdit/upload/files/fojobituwabifuzawulirovaz.pdfIn PDF document text
    • http://zs-oilfieldequip.ru/d/files/xetivafutojugasazixapi.pdfIn PDF document text
    • http://jeremypourstarlight.com/clients/5/53/539822683240d2210db56c0084569a8b/File/nuvavubenu.pdfIn PDF document text
    • https://underworldgear.com/upload/users/files/tuzoxetezopakumipemiba.pdfIn PDF document text
    • http://alphanaturehk.com/userfiles/file/damafuwig.pdfIn PDF document text
    • http://ivepe-elearning.gr/assets/UserFiles/mainHome/file/31601726711.pdfIn PDF document text
    • http://k1a.ru/images/files/file/xokewizugoduduwofob.pdfIn PDF document text
    • http://championsview.net/userimages/11575582775.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/db5a0bdedce6f38a5519df1b721fa335/85732827242.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=haskell+school+of+expression+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0007f559.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7F559 22728 bytes
SHA-256: cd55fd56b367fd4b867071f932dec8338d52a0be71bcec6bb8634a5c69ce0f3d
font_01_sfnt_off00083410.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x83410 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00084bf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x84BF9 1540 bytes
SHA-256: d7e2ea374981a83e211b511a5fa9c5bd72cb9ee88eec9c90502ec523451dae64
font_03_sfnt_off00085451.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x85451 16096 bytes
SHA-256: 0d3c258c427dc2269fb99f11d6b61b9561f48e32d8d4965331da2114a4068aa9
font_04_sfnt_off000869a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x869A1 10804 bytes
SHA-256: e3cdddbc5c65c61ae11ae4e991ebf25c92185ed976caf2202ca5e5bfdc533f04