Malicious PDF — malware analysis report

Static analysis result for SHA-256 75769cf9da0e4ea5…

MALICIOUS

PDF

75.6 KB Created: 2021-09-16 18:32:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 550066f122e2d5eb2eed53502b8e0edd SHA-1: d1355a5469932e43d899c3c473ba89e4c9783713 SHA-256: 75769cf9da0e4ea5e1273a463071f3007c2a409379e65d2430f06937840cc903
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs, many of which point to compromised websites or disposable hosting, indicating a phishing or redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The presence of external URIs and link farms points towards an attempt to direct users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://archism.ru/uplcv?utm_term=ronald+comer+abnormal+psychology+pdf PDF link annotation
    • http://tmkb.org.tr/ckfinder/userfiles/files/69931352344.pdfIn PDF document text
    • http://retrolondontees.com/userfiles/file/rewatutejurakidowomos.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/161394b6604e4c---bogijivapogaturi.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/e4005b25ddfa841f2b2b4035a2cb1164/venuxokoz.pdfIn PDF document text
    • https://georeno.ca/userfiles/files/73903647203.pdfIn PDF document text
    • http://mastervgtour.by/var/upload/file/24823503365.pdfIn PDF document text
    • http://lovesenergy.nl/file/zojegatejaf.pdfIn PDF document text
    • https://sopkambing.com/contents/files/lobikaj.pdfIn PDF document text
    • https://vsevolozhsk.mebel18.com/uploads/files/wajodofinabibevabadinajep.pdfIn PDF document text
    • http://sangiorgioautoservizi.com/userfiles/files/dopeluvikexamabu.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/73014460634.pdfIn PDF document text
    • https://matrainagycsalados.hu/userfiles/file/dafifogekumeraxow.pdfIn PDF document text
    • https://bbu.vn/Images_upload/files/simitafadavo.pdfIn PDF document text
    • http://koreanhotpot.com/uploads/files/judegirofe.pdfIn PDF document text
    • http://www.sana-anong.com/ckeditor/ckfinder/userfiles2/files/42889364832.pdfIn PDF document text
    • https://inprovitargentina.com/ckfinder/userfiles/files/83576137310.pdfIn PDF document text
    • http://loca-granderoue-montaletang.com/ckfinder/userfiles/files/dalurowid.pdfIn PDF document text
    • http://embeddedhr.com/ckfinder/userfiles/files/zajefep.pdfIn PDF document text
    • http://thebrownbag.vn/upload/files/mowibereva.pdfIn PDF document text
    • http://trips-in.com/ckupload/files/96880240509.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613cf7b7d895d---fasupade.pdfIn PDF document text
    • http://www.ez4parcel.net/upfile/files/2021/09/03/dutupedekebe.pdfIn PDF document text
    • http://hakasasi.id/userfiles/file/kolevurisuzilid.pdfIn PDF document text
    • https://bouveau-consulting.com/userfiles/file/50116763840.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_off0000c522.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC522 16364 bytes
SHA-256: 5b7c227af68a7f9d631abaf4880fac646ae4352bef46dbb847ad76a2c4f73a4d
font_01_sfnt_off0000ef64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF64 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001077b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1077B 11176 bytes
SHA-256: 11050dc3cd13d8a53b5c52f882e91c750d26a014131f25424a443590290657f0