Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4badd649b661d77…

MALICIOUS

PDF

90.5 KB Created: 2021-09-03 00:05:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e6ea62ae88f1f6c0390d16843fecd3c2 SHA-1: d5953f140b7837d5fa7a18b1431d9d6b41ddad86 SHA-256: a4badd649b661d77baf243397c69b913fdf0823bc91a3e9e7ae0080ed0250dbc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://annjulieskarpmo.com/userfiles/file/loredobajajupotaponuroz.pdf In PDF document text
    • http://studio-orlandini.com/userfiles/files/tafojamanolaxinogidopajox.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb2308b8be3---58131546543.pdfIn PDF document text
    • http://avatars.ru/userfiles/file/3328264427.pdfIn PDF document text
    • https://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/592be7ad25867f00f8ac3c8c1692f85d/69865687583.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/922e2e9fbe1ca9df88ffb3ff1a6c5e32/26850827992.pdfIn PDF document text
    • http://uitvaartverzorgingsindex.nl/images/uploads/4999454359.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/ed0aaedc51c06854f915bdb3dd86d2bb/zapegajututoforonotuz.pdfIn PDF document text
    • http://ahzycw.com/upload_fck/file/2021-8-23/20210823141452488231.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/5mk3nlv1nnpqqvl1vkgcu1ml7r/siguxex.pdfIn PDF document text
    • http://fanta-life.com/userfiles/file/dajibumekamiz.pdfIn PDF document text
    • http://wabasnb.com/files/fckeditor/file/116738967260d75eb434f62.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078e0ed72334---buraxojonid.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607049240c241---89273415652.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/2d450abffebfbdcc6091f95c477ffed6/menosumow.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/33939796360.pdfIn PDF document text
    • https://hunglivet.com/uploads/files/202108281858295067.pdfIn PDF document text
    • http://adacu.org/userfiles/file/20210615190219.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b01250960e2---57910788358.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/018a5c3d98d27299d9736a3fb3c4b776/talitagubijof.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16115e4100703f---pebesitazatod.pdfIn PDF document text
    • http://mini-garden.ru/userfiles/file/32339264375.pdfIn PDF document text
    • http://livingkaneohe.com/userimages/xavebe.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/16106d0eb4fe47---kifopedorekewi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=rig+veda+sandhyavandanam+book+in+kannada+pdfPDF link annotation
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/5709b2aa16b89b2bd95171bf587e6e15/tuzabumorudabaropalawanu.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_off0000ede7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE7 11156 bytes
SHA-256: fde606e4a1d5a13bf87ef606d24d07178db8540f13904de1e5a7d856a0f40487
font_01_sfnt_off0001075b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1075B 23208 bytes
SHA-256: e63077ffeeb5d3e2f1c97b75d55864cbc0490dbb532d0e288a4623a1ecbd3e0d
font_02_sfnt_off0001442b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1442B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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