Malicious PDF — malware analysis report

Static analysis result for SHA-256 b76dc49a932ac407…

MALICIOUS

PDF

82.7 KB Created: 2021-06-26 00:01:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: fb0b08366323172b9f786bee5e6dd57b SHA-1: 632b9a8eb6ed470cc0e945a9f53af12f59d820cb SHA-256: b76dc49a932ac407fa0675f00b34fa61dceeb30adfc4e2e49026d23e1801c1d3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous external URIs and link farms pointing to compromised WordPress uploads and disposable hosting, indicating a likely attempt to redirect users to malicious sites. The document body is heavily obfuscated and unreadable, providing no further context on its specific intent beyond the observed link farm behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

Heuristics 6

  • 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 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://infrive.ru/uplcv?utm_term=if+the+diagonals+of+a+rhombus+are+12+and+16+find+its+perimeter PDF link annotation
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/06a603e1079826495383e2ef93af8895/botupixarizak.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/daa12htpmskl6h6if56d9k12oh/kerewebubig.pdfIn PDF document text
    • http://satisfytech.com/ck/upload/files/93735512301.pdfIn PDF document text
    • https://harvestrain.com/wp-content/plugins/super-forms/uploads/php/files/194bbc2095c63415306c80073ad4da6e/22629151456.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f10dd54915---xukojewibusox.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/dc2f92cce96cf94eebb7590e91af5faa/46985556981.pdfIn PDF document text
    • http://goodslib.com/userfiles/files/28002901297.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/0ca6733cc9d54b1570849c7163f91aa7/23011437837.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/p46n2fj948mr7uto87drn9e0s9/duwipizanix.pdfIn PDF document text
    • http://tokyoracing.hu/userfiles/file/30711814271.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/r3hrm37dkib5p5fl2eeb21lgre/bexelakipipo.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a57cf58c75c---nusilit.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/ralomuluvubizuguji.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/08ef54b2a555e571ad71f216290cc506/25084542274.pdfIn PDF document text
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/koojdmotuegimvrt3bca3haptd/dijepujaw.pdfIn PDF document text
    • https://datajournonepal.org/files/49913906474.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160a1974c8dbac---33138313858.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/k16ubfk33dbotcg5122k83q5b2/katise.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b41d3dea2e9---79295821973.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/k1q6sasib530dtl2opmes08ha9/26563634486.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/93ed88ed7e0512ed97baeb657be66c3e/24117032947.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/atvqmavc1aqtnge85d35ff2qn7/setedudaxexewileloranur.pdfIn PDF document text
    • http://e-pisanie-prac.pl/famprojekt_z_serwera/images/file/94672399773.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/444outbmh86ql6oqg5eo0pf23j/33781772471.pdfIn PDF document text
    • http://cokhihoangvinh.com/uploads/userfiles/file/22881264061.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c36b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC36B 11476 bytes
SHA-256: f7accd216a21eb8f2ecf328e5cc283ee190e5246d8c594b2ea55f6222a1b84b3
font_01_sfnt_off0000de10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE10 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f622.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF622 17892 bytes
SHA-256: ab93709a2d30d2f5287ddbad862d27515b21519091ce0024413820d6f4794ad0
font_03_sfnt_off000124e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124E9 16156 bytes
SHA-256: 15bdb3869d8d4458aad361551f68459b5691bbaf699be9bec01cb82de0a2cecd

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