Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f3a84db46805d92…

MALICIOUS

PDF

90.3 KB Created: 2021-07-09 02:41:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 10fa8861c9c19e21f8275b4e79478608 SHA-1: c95fc9b28ee096b92c57babf9f6ca3a10ab375a1 SHA-256: 5f3a84db46805d9216c314564dcfb667bb1f99d8ce662a2e622a88d89995efaf
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised WordPress upload directories and disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or exploitation.

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://mo-space.space/web/img/podborky/files/tolafopijupoxujegekab.pdf
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/f0474fe2957efcdff4d7b3bf44535364/84730981383.pdf
    • http://salonorganica.ru/upload/files/81035055605.pdf
    • http://sooclose.eu/upload/File/50036020203.pdf
    • http://educationexplosion.com/clients/a/aa/aae59ec6301d25964842a0067e0ae100/File/63345775824.pdf
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/b59129c264e9a85f1c1a6f23f548b596/5783347825.pdf
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607227d5e9aac---11505966410.pdf
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/6d570a9448e5c41ce61bbf048ef0a8a8/51876749565.pdf
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/91gh3066nkire4hsljnrj4lik5/62148349546.pdf
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/16076d76dbf44f---87820842719.pdf
    • https://icbacademy.com/upload/files/bizofeduxek.pdf
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b54df18582e---33651335295.pdf
    • https://tbsva.org/Upload/files/20210708040808.pdf
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/160868e66b01f7---35312235021.pdf
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/de66gug45cjirth8ldad3o3nce/gukosokovetugasigodubor.pdf
    • http://charivne.info/images/file/vamiwemuxutevu.pdf
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606e1f1959d58---50760199415.pdf
    • https://toskov-yordanov.com/userfiles/file/vufumibezotudisawon.pdf
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce62c191cf---52929399132.pdf
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/st3acs5tmpfaptlbo54d3ns252/nogukenigonatezedubagiz.pdf
    • http://dohertylaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mimebogul.pdf
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bc8e15ac952---vetatajitopagorivukuse.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=hypercalcaemia+and+cancer
    • 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_off0000ff78.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFF78 16792 bytes
font_01_sfnt_off0001178a.bin
6c2f6f2c22d64777403e14dc2e4cee99ab94f3ba5f843b429548614c9bf14f2e
pdf-font-stream PDF embedded font (sfnt) at offset 0x1178A 17180 bytes
font_02_sfnt_off000144be.bin
dd6dbd7109151d388db8720ac3525131213063793bf25562024b331657414452
pdf-font-stream PDF embedded font (sfnt) at offset 0x144BE 10396 bytes