Malicious PDF — malware analysis report

Static analysis result for SHA-256 45fe2083894da8cc…

MALICIOUS

PDF

91.0 KB Created: 2021-07-26 00:36:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: a6526c2d184593954afd8f01d747e263 SHA-1: c30727c6a6c9fa51adb14e7fb871aa26bd9bcad1 SHA-256: 45fe2083894da8cc90f3fc70f7a407e55e9416095f6e242aa52b4bc0cf3afd1b
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many hosted on compromised or disposable domains, indicating a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. The presence of multiple external links, including those pointing to compromised CMS uploads, supports the attack pattern of directing users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://sam-global.ch/files/file/sumubiwefiloposofuvefoz.pdf In PDF document text
    • http://mobydick-band.de/fckdata/file/banuj.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160867f99bb1f8---rotuwubozarapizo.pdfIn PDF document text
    • https://avayemehr-carpet.ir/data/file/74652784161.pdfIn PDF document text
    • https://tkquiz.com/userfiles/file/fokoxevik.pdfIn PDF document text
    • http://maidichike.com/upload/files/44546338857.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/c3f28fd5eaecca4cb147ede33473c370/xuruvabebisanamafokuj.pdfIn PDF document text
    • http://lungshingcentre.com/userfiles/74178974811.pdfIn PDF document text
    • https://motiv8workout.com/up/files/talutodil.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606d97e3a8451---63080283241.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/b3f3df2b76706477598f9df19174ddc9/69190063347.pdfIn PDF document text
    • http://benrassam.com/uploads/files/viromevuzijuxopube.pdfIn PDF document text
    • https://drinkpoint.com/uploads/files/14799130448.pdfIn PDF document text
    • https://oilbasaro.com/web/images/ckfinder/files/20210702065702.pdfIn PDF document text
    • https://allmassage.net/upload/file/20210522235335.pdfIn PDF document text
    • http://drapikowski.pl/uploaded/fck_files/file/rokifusebuwivepakij.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/6t88p5i0kgkkmr37u7raghrhp4/sosowukuvulogilukubamapes.pdfIn PDF document text
    • https://ive-cal.it/file/76540475156.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e9590789a4---51945560630.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/fmds40665id8n2jl1kr9p7d9b7/rodedugizematelabeput.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/789349d9944859ac7985fab110803f80/10147236928.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/608ec40971209e6b03d1dbd4230cf914/58455979138.pdfIn PDF document text
    • http://universe-micro.com/upload/files/20210623_115916.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/8hpnsnjqaa502207a7oc5cfi05/kavaw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=ejercicios+resueltos+de+dise%C3%B1o+de+intercambiadores+de+calorPDF link annotation
    • 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_off0000f763.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF763 18844 bytes
SHA-256: 3874b578802a7bbf3220c02ef003d5193b7819622d59393b46146685c0122e31
font_01_sfnt_off00012853.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12853 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001406a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1406A 11088 bytes
SHA-256: 966ce165c9085876123464d3fbdb013653a204c575aff9e859aa8c6dc30ad304

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