Malicious PDF — malware analysis report

Static analysis result for SHA-256 742261b8cbd440bd…

MALICIOUS

PDF

83.1 KB Created: 2021-08-20 11:12:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 429394973d5fc44ca805db33f24fb28c SHA-1: 7031fddc8283b8765fc3657e2148a13b2fae25ef SHA-256: 742261b8cbd440bd15ad6cdd463275e356a45d7d4aa0bcc6bf9e200a7171961b
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing or malware distribution lure. It contains numerous links pointing to compromised WordPress uploads and disposable hosting, designed to appear as legitimate file downloads. The embedded links, such as http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/160875c595ea75---95095691964.pdf, are part of a link farm strategy to obscure the true malicious destination. No scripts were extracted, but the structure strongly suggests a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://inwebjor.ru/uplcv?utm_term=how+to+use+easy+bake+oven+instructions PDF link annotation
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16096261e4a154---wikewalolejezejulivawone.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b3970355943---83054568389.pdfIn PDF document text
    • http://alotercuman.com/ckfinder/userfiles/files/46057117339.pdfIn PDF document text
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/a963199ad5094f6ad2e569aa828572a2/dozodaxorakutijaka.pdfIn PDF document text
    • http://agro-pasz.pl/ckfinder/userfiles/files/kidadipifozadudor.pdfIn PDF document text
    • https://consurs.ro/ckfinder/userfiles/files/tavodapa.pdfIn PDF document text
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/160875c595ea75---95095691964.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/sevilatimokixi.pdfIn PDF document text
    • https://www.libyamonitor.com/sites/all/libraries/ckfinder/userfiles/files/14730083827.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/2b1f4e3ecd8a58427f1ef7692acb4aaa/boxolitizizin.pdfIn PDF document text
    • http://2016.letnifestiwal.pl/ckfinder/userfiles/files/2819268765.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0a5b4d221---tagabubarob.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/cc1fde25dfcd4886dfbe508437a71eba/todamerewexezagokaluve.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072112a5297e---57923035490.pdfIn PDF document text
    • http://cerrutistudio.eu/userfiles/files/mavuvogijebeduvu.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/kbnkjugdnrsfl5vsftvbum0jom/tatotuxinofuv.pdfIn PDF document text
    • http://scheiden-maassluis.nl/uploads//file/33854049854.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c69d1353ff9---jutivosa.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607909aa71c72---wuxan.pdfIn PDF document text
    • https://www.groupenahno.com/wp-content/plugins/super-forms/uploads/php/files/s9djtps5odill0u3p1l21ukf0k/gudefekivuduzekux.pdfIn PDF document text
    • http://sparkpro.lv/content/file/wudazupagafisiwuga.pdfIn PDF document text
    • http://domeinbeverdonk.be/assets/files/file/15067493189.pdfIn PDF document text
    • https://tortugafilms.ca/adminfiles/file/60185844185.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_off0000e0e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f8f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F5 17220 bytes
SHA-256: 9189f98b00b0138aa9b4ab0e3057baf6bf2e3dcf0b1eb54e9c5300d534ea6550
font_02_sfnt_off000125eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125EB 10768 bytes
SHA-256: 3e3ce3a23ed627c3747dab8b70b0b909cb649a3401f3e2a29995f5216a63c901

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