Malicious PDF — malware analysis report

Static analysis result for SHA-256 3970b3a7906700ae…

MALICIOUS

PDF

85.2 KB Created: 2021-07-05 09:17:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 862956bc29c09fb5a5f84e3e4019798d SHA-1: fc2fade1142e7687b360f75d651d6d16f1e0fea6 SHA-256: 3970b3a7906700aeb67da247bcaa86d8eb9f49cc405067f49538625e1f7a37b3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm hosted on compromised CMS uploads and disposable domains, suggesting it's used to distribute further payloads. The presence of multiple links to PDF files on various domains points to a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084ff6e25822---melap.pdf In PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d6ac13f345---kevimefozogodirosupokub.pdfIn PDF document text
    • http://hainescentreasia.com/images/file/29523292687.pdfIn PDF document text
    • http://muacuoi.vn/Pictures/files/kejok.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/b3f465e18e9c4d7171894b814d5607b6/70826456619.pdfIn PDF document text
    • https://vico-real-estate.com/ckfinder/userfiles/files/79291266214.pdfIn PDF document text
    • https://stopserv.ru/files/file/3582980031.pdfIn PDF document text
    • http://thessalonikiflights.com/files/files/lavubokanamedafufow.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/d893b97b74cfdb0c0771607779aff313/742036598.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/cjvjr49kb82gbh6t09gfl2rb9g/gijubowumiduzemumudap.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/ca3ea375999e9786940bec59db04bd1d/maziwezopiseze.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/e1ff604ecbf725be258633170b42541b/vilafafojajejo.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d0c884659ce---fonulegeguwodozasepafadu.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/e1d464a4856d67950bc05910f226c9dc/nawesubawagosijibanefo.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a584c50a271---movubuxiveb.pdfIn PDF document text
    • http://psychologyforeverybody.com/ckfinder/userfiles/files/penavupikezudovik.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/160789ecf4805d---pabefiriwinunularememe.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/26063127289.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/cfa38c6c4f1125fd1f0ada03f85542af/82026153425.pdfIn PDF document text
    • http://permanentnimakeup-brno.cz/userfiles/files/gimejurunolomidafupe.pdfIn PDF document text
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/6681dde992f0440f243c573faedd2e27/28374203317.pdfIn PDF document text
    • https://hijaulumut.com/contents//files/fuvulivudim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+cancel+a+meeting+in+outlook+calendarPDF 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_off0000ea82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA82 16968 bytes
SHA-256: fac2a765741c0e76077206e938929b792109ac1b3f201f738f12194ed019406c
font_01_sfnt_off000116a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116A3 10816 bytes
SHA-256: 2a8ad7213bea4325bb16a3606465ca47c0f674d149bc4e5cd637db63283a9b28
font_02_sfnt_off00012f53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F53 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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