Malicious PDF — malware analysis report

Static analysis result for SHA-256 1920d74fc1d39b0f…

MALICIOUS

PDF

85.9 KB Created: 2021-09-19 08:02:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2076d1882af2143b51387645111e6f7f SHA-1: a5e6f3a7a1b50b3c99b1737ae84aca0c634dcd6b SHA-256: 1920d74fc1d39b0f9939525c4f2cef7e37fb0bdd9d1524be503a77eadbdcc09c
156 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 CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The primary attack pattern involves luring users through a seemingly innocuous document to external, potentially harmful, web content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • 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.
  • 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://axlthailand.com/imagexx/files/xubegonidewomobisamizegi.pdf In PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16140b985ed348---80639708135.pdfIn PDF document text
    • http://esejsc.com/upload/files/wotidesugabemebavolepidip.pdfIn PDF document text
    • https://247christianity.org/fckeditor/userfiles/file/887406897011630784023.pdfIn PDF document text
    • http://sunmoon-glory.com/web/upload/files/zubibezadawagajamenidu.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161320bcedae18---zoliwijekumevome.pdfIn PDF document text
    • http://kemenyseprosiklos.hu/upload/file/50280497037.pdfIn PDF document text
    • http://webcertain.ca/contentupload/fckeditorUploads/organization_/file/xomotud.pdfIn PDF document text
    • https://www.burnat-provins.ch/ck/ckfinder/userfiles/files/dojidipekokotime.pdfIn PDF document text
    • http://noahmission.org/dataroom/file/joduxesur.pdfIn PDF document text
    • http://e-kva.ru/admin/ckfinder/userfiles/files/bawitafaxemoz.pdfIn PDF document text
    • http://lg-palette.com/upload/files/27671722074.pdfIn PDF document text
    • http://renknh.com/ckupload/files/sudilumikakajenujawiv.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/161370f3562a1e---talawaguvavizataw.pdfIn PDF document text
    • http://rem-proekt.com/f/file/depexikoxudito.pdfIn PDF document text
    • http://sjhrz.com/images/upload/File/sikepetewodomox.pdfIn PDF document text
    • https://ctapigroup3.com/contents/files/73262949292.pdfIn PDF document text
    • https://taucaotoccatba.vn/images/news/files/3401939687.pdfIn PDF document text
    • http://hzkontejnery.cz/ckfinder/userfiles/files/kutuvimirobiramiz.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/3c4db2a1528ae3881d020f669f77de18/36150542429.pdfIn PDF document text
    • https://tinnituskozpont.hu/files/bosumixotip.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=redmi+note+10+pro+max+vs+poco+f3PDF 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_off0000e4b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4B3 19056 bytes
SHA-256: e7e3be43089125314784bf7192e4a4151ba0624a11c41079db2db6f9a66db97d
font_01_sfnt_off00011724.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11724 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012f3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F3B 11292 bytes
SHA-256: f6f7304c9718fd078f1e54b716ba3500df1bf9c6c5c4e0fa9b3b2fed112a3ad3