Malicious PDF — malware analysis report

Static analysis result for SHA-256 a341ea9ce11940c6…

MALICIOUS

PDF

84.4 KB Created: 2021-09-06 13:36:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ed3dea6fd48bc33b8471306dfcf3063f SHA-1: e63d6958881edf0e57224ac7721239018e14c8fc SHA-256: a341ea9ce11940c629b805bcfb419fa4d545f9fb06501ce9e664761ee4e99ca5
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It functions as a link farm, containing numerous URLs pointing to various domains, some of which appear to be compromised CMS uploads or hosted on disposable domains. The primary purpose seems to be directing users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://queure.ru/uplcv?utm_term=auriculas+y+ventriculos+del+corazon+pdf PDF link annotation
    • http://clair-environnement.eu/catalogue_dynamique/file/72792842703.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb646fefbb2---85812650563.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/senp6ha7rqb2mqcfjc9f904lo7/xadolobelikawiguloxojixo.pdfIn PDF document text
    • http://abroadster.com/files/makaxotizi.pdfIn PDF document text
    • http://locthanhroyal.com/upload/files/dakopibuf.pdfIn PDF document text
    • http://lovesushiscv.com/uploads/files/63680393613.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/pji8hrbjdqhnv8g4jttpuie3i9/96503834035.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/6215196893.pdfIn PDF document text
    • http://jrjohnsonfamilyreunion.com/clients/0/09/090f04f22b165063c0e57546eb93b169/File/wesoligu.pdfIn PDF document text
    • http://candientushinko.com/images/file/zesekosofopa.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ba90b8bed25---fuxabezokozomo.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/sikibubev.pdfIn PDF document text
    • http://aj-logistics.com/stock/userfiles/file/mapuwofulewola.pdfIn PDF document text
    • https://pianotuningdarwin.com/userfiles/files/danavamazigowutalene.pdfIn PDF document text
    • http://bbbswalkforkids.com/clients/c/cf/cf8d0549bdc9bbdffca8bc0db9808b96/File/dipadimorurenefo.pdfIn PDF document text
    • http://snotlicker.com/clients/10243/File/pesegege.pdfIn PDF document text
    • http://roland-toys.eu/userfiles/file/21591081116.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/c58ac86cc1922af77af1fbc6b31a526c/21509177702.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/6s3hkm1mliu6kaq7ie4guq65u4/62577139600.pdfIn PDF document text
    • http://jgbt.us/pds/userfiles/files/mafagagutep.pdfIn PDF document text
    • https://studybrilliant.online/app/webroot/img/userfiles/file/bexerokojebavuwufiritural.pdfIn PDF document text
    • http://nyitotthaz.hu/userfiles/files/78816083228.pdfIn PDF document text
    • http://ebbers-schilderwerken.nl/uploads/files/67967966371.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_off0000e108.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE108 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f91f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF91F 10936 bytes
SHA-256: 78832504c000a51ad77662333f64922e8530f310dae8c7ba89abaa28d3fdfd96
font_02_sfnt_off000112ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112AC 19320 bytes
SHA-256: ea351954ac9a6f012041e051249b899a5bb87ee1a7550bdc68f8210877961c86

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