Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1046bca48a8959a…

MALICIOUS

PDF

85.1 KB Created: 2021-06-28 02:50:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c2cfc890dec9425272c7cde6e53231bf SHA-1: c5c49931f165c4f916224ac0e159dfe2fd2daf31 SHA-256: a1046bca48a8959a9abf376f94c3193093475d81aa1f8d304dd4e96fa1c1415b
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 pointing to potentially compromised WordPress sites and disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is heavily obfuscated and does not provide clear instructions, but the presence of many external links is a strong indicator of malicious activity.

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 http://fullx.net/files/retuxijowuzuripuzuj.pdf
    • http://519pf.com/userfiles/files/18913303511.pdf
    • http://alexlunacoach.com/img/editor/file/miwavunar.pdf
    • http://dlzj.net/upload/files/20210530075830122568.pdf
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a36f77dbf5---satotavelog.pdf
    • https://accuratesearch.com/userfiles/file/36662255512.pdf
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/kl6gkca47gffjm14t7pbcsfaic/38200362540.pdf
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cfe60d1301---dopadagolajokukadoro.pdf
    • https://mamo-tato.ro/userfiles/file/vapiwavipaponibara.pdf
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc84c15bd4---67891216586.pdf
    • http://ajtoablakcentrum.com/_user/file/vabupibeki.pdf
    • https://airflow-skateboards.com/upload/file/83845307371.pdf
    • http://szpital-sulecin.pl/images/fckfiles/file/51008433226.pdf
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1b48991775---mudigigadekusijopep.pdf
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16070d63a5ae97---xugolex.pdf
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160890b08b5043---xozosuvufitiwaduzuled.pdf
    • https://mmagame.com/userfiles/file/nojudobuvi.pdf
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/37c69fdd5b1af117b275c997374adc0e/65138281636.pdf
    • http://offerseir.com/basefile/offerseircom/files/71595818051.pdf
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac83e958235---mefidotulukitosuz.pdf
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/eg367mceo6435jqh2e1p2c7jeh/zusunizasaneso.pdf
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8bf9825d15---pasiza.pdf
    • https://cafepiolho.com/uploads/assets/zixejakegivulokalafewaduv.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=games+like+stuck+in+the+mud
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec04.bin
6874cd491187b2859049984980173160e28d6a1db7d9a2e750861e14a7f60cef
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC04 16632 bytes
font_01_sfnt_off00011705.bin
bb448a6598b07c6b88e1d4ccca4309c3ebcdd167fb5cae37b5b63d979e1ba509
pdf-font-stream PDF embedded font (sfnt) at offset 0x11705 10648 bytes
font_02_sfnt_off00012f31.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12F31 16792 bytes