Malicious PDF — malware analysis report

Static analysis result for SHA-256 5aaacbad0f457cfa…

MALICIOUS

PDF

89.6 KB Created: 2021-06-26 00:47:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d065c5b4b83a7665154da1224c83cf61 SHA-1: 571528338031f7f0f924c92b3b1fab2736d58836 SHA-256: 5aaacbad0f457cfab47463eace29b0e6279e5eb7a45579ac8b8517fc0685df3a
164 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories, suggesting it's designed to lead users to malicious content or further compromise. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609f9273a8e29---69196822723.pdf
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609600e02d9ce---fawukaraxajumel.pdf
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b07c64f1704---83868519982.pdf
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/42160c3973a4e57ba9c4e41414ff6748/vezoxoxelumubufejazima.pdf
    • https://people11people.com/uploads/File/3202693993.pdf
    • http://www.firengo.com/userfiles/files/ruxuvojuxaxekavutudipuj.pdf
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/gbe14cb4vjnv8refq9318s2hlp/baxalek.pdf
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607333a271873---fugunusedefepibarajez.pdf
    • http://meble-tk.pl/userfiles/file/26740717068.pdf
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/0e2c12543dcdf1a590c75611223cc713/12428067509.pdf
    • http://tfh-filter.hu/_user/file/50829528889.pdf
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080314d258f4---72917362525.pdf
    • http://cdmvt.cz/sites/default/files/81565735781.pdf
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c992e2bb378---xudexomudesezorasetileguk.pdf
    • http://creative-format.com/upload/editor/files/94078473131.pdf
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad5fc9d12f2---wujatakuzezowunazen.pdf
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/qe7pmr0fbaslhqebidqtvfqpv4/99042157360.pdf
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/40d4deeca9e363f77666a888f6d85571/sobizudomotowasidapuxol.pdf
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/k6m6q2hodp3ui5hoejoa4oerpc/57331948316.pdf
    • http://bethanybaptistcolumbus.org/clients/75549/File/29202551132.pdf
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/ts5hhfo0l5hs9t4gl7gsagn1s3/mudasinozos.pdf
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/09873046b9d680149e212a3e49f71f45/92600730609.pdf
    • http://costanzolegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/94569675763.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=my+school+questions+and+answers
    • 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_off0000faa8.bin
7f4c9d682ac618e6694edba01f6559195fa8b4b602cc15d9c22e057dbb9dcd52
pdf-font-stream PDF embedded font (sfnt) at offset 0xFAA8 17288 bytes
font_01_sfnt_off000127ee.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x127EE 16792 bytes
font_02_sfnt_off00014005.bin
ec567bf392ee3c422b77c0b04db90712d84b37796958f97e9b6364ef4937c2bd
pdf-font-stream PDF embedded font (sfnt) at offset 0x14005 10904 bytes