Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5090a7cd4a2e234…

MALICIOUS

PDF

83.2 KB Created: 2021-09-17 21:34:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: aca5e80a73f0baf26ec4be51a79284f0 SHA-1: 394da39f2061dbbbdf31392e7e9453fb8a5e3fd2 SHA-256: a5090a7cd4a2e2349fbe0b5128a3610cea4dcb1c3b8075e6b3c1d63020992bd7
156 Risk Score

Malware Insights

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

The file was identified as malicious by a machine learning classifier and ClamAV, detecting it as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to potentially compromised or disposable hosting. These links likely serve to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ketchas.ru/uplcv?utm_term=how+to+use+4ukey+for+android PDF link annotation
    • http://ptairsupply.com/userfiles/file/49912960022.pdfIn PDF document text
    • http://qlionshousing.ca/userfiles/file/40539117200.pdfIn PDF document text
    • http://nathulaldasptti.com/ckeditor/ckfinder/userfiles/files/69836246612.pdfIn PDF document text
    • https://detskeihriska.eu/ckfinder/userfiles/files/lulasetibawijirizewufilo.pdfIn PDF document text
    • https://illinoisfiscalpolicycouncil.org/app/webroot/userfiles/file/teposexelo.pdfIn PDF document text
    • https://ags-car.60km.com/upload/files/xokavodojijosuwobaboz.pdfIn PDF document text
    • http://zkmeiqi.com/admin/ckfinder/upfile/files/98518263573.pdfIn PDF document text
    • http://ipcmanpower.com/admin/style/images/userfiles/file/mexagupigamodobe.pdfIn PDF document text
    • http://web-news.eu/www/pkpar/userfiles/file/92049187611.pdfIn PDF document text
    • http://pomocnaukowa.net/Upload/file/12911234966.pdfIn PDF document text
    • https://fidelishospice.com/ckfinder/userfiles/files/sepasewab.pdfIn PDF document text
    • http://bakefruit.com/uploads/files/202109090253381888.pdfIn PDF document text
    • https://paidionresearch.com/userfiles/files/58569378063.pdfIn PDF document text
    • http://e-baze.lv/images/site/file/mezadimupuruwavulisaguk.pdfIn PDF document text
    • https://mccartha-cobb.com/userfiles/files/63022450092.pdfIn PDF document text
    • https://aspit.ro/imagini_ws/zixalabewa.pdfIn PDF document text
    • http://rvhifi.cz/files/file/tobamupasekanotuwezinuw.pdfIn PDF document text
    • https://aannemingsbedrijfbarthulsbosch.nl/userfiles/file/rirefizeretujile.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/39109215667.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/1b5e95fc08fdf0dd229e218886761c96/24295966723.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/161402d3ae7895---9449291393.pdfIn PDF document text
    • http://xn--krmer-dnnebacke-1kb72b.de/files/file/koleneremo.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/nixojigado.pdfIn PDF document text
    • http://golfvillageonline.com/userfiles/file/giniwafufawudabelamuraguf.pdfIn PDF document text
    • http://cityfate.com/files/files/72457464672.pdfIn PDF document text
    • http://abwessex.com/uploads/files/wovenanasuzegujutidawol.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/16144b92d5f86b---nuvanazetadawukuzaletolu.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_off0000de13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE13 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f62a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF62A 10764 bytes
SHA-256: e8f7ec7b1b061b4b350930dcd97c7a1515a43665f8aacbc5391c24d7b5c66906
font_02_sfnt_off00010f2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F2C 18524 bytes
SHA-256: e323c0f4e0580694d8c51682a405062057d5a81d300ccf2c50143e6160d61391

Open this report in the interactive analyzer, or submit your own file for analysis.