Malicious PDF — malware analysis report

Static analysis result for SHA-256 04369a4e602ea6b4…

MALICIOUS

PDF

87.2 KB Created: 2021-08-20 23:59:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 18b9580cc5ed8d3f83fb54ce5e69eac9 SHA-1: 361379fb8b2a1cf03cbb722559794d33dee3141f SHA-256: 04369a4e602ea6b47e444a4fe4e95023dd41994931174a98f912178dbe22ebc3
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a link farm designed to redirect users. The presence of external URIs and compromised CMS upload links indicates a likely attempt to distribute further malicious content or phish credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://smidgel.ru/uplcv?utm_term=volkswagen+escarabajo+1600+ficha+tecnica PDF link annotation
    • http://fotossc.pl/_files/file/limotugevimizavoto.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160cb7f1006f64---fiderejakaxitiw.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/s8o9j2ju16ojrbjneq1toqhner/63913302321.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d9fd13e072c---93719365836.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/a8ubp171f5lri1burjn3fkmd94/firel.pdfIn PDF document text
    • https://ptkas.com/kingkong/userfiles/files/18015610363.pdfIn PDF document text
    • http://laros.cz/UserFiles/file/xigul.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/4lbolhrg2updq9otr08l27blhe/wuwezotepagokezotone.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608be05b29f51---pefoxavonelonojij.pdfIn PDF document text
    • https://dbjadow.pl/attachments/file/47306262282.pdfIn PDF document text
    • http://tkhomedeco.com/assets/uploads/ckedit/files/20210725232300.pdfIn PDF document text
    • https://study4student.com/cache/fck_files/file/16950026917.pdfIn PDF document text
    • https://chandrakantmusicacademy.org/ckfinder/userfiles/files/21504388557.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ccc730aa511---duvifiralupowupudexepeb.pdfIn PDF document text
    • http://iziusb.com/userfiles//file/62869609073.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/091a8cbmft8bnqs9tpe2j5l714/rowez.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160cfec8bc9f62---73779355784.pdfIn PDF document text
    • https://et-auditing.com/userfiles/files/relevolivafurenabami.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/9d1191e6a4359356ad61caf46cadda4f/82870963494.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1608202c94dec6---wukabumilezaboj.pdfIn PDF document text
    • https://pmcp-avac.com/files/upload-ckfinder/files/lolewo.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1607548cc4938f---virojaxapite.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_off0000eb58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB58 11372 bytes
SHA-256: 0d51d4a97d8227cf5af50a0fe04c42dff1f7e6c0d5a39acfcde819e9eebb9dd0
font_01_sfnt_off0001062f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1062F 18356 bytes
SHA-256: 9f371099323f2cf88c91761ba87e4703b5a369e8f26a0403b2cf7f4bae730ab2
font_02_sfnt_off000134df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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