Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d98cfb747625b8c…

MALICIOUS

PDF

81.1 KB Created: 2021-06-27 19:07:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 4f755fa5da28df038cf8806e2c88785e SHA-1: 0e7407b953ab27d361aab44448289839c6262792 SHA-256: 5d98cfb747625b8cfea3d18f64317e1b84b020711d41ac3d2d53e0330f8fb75c
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, suggesting a link farm designed to redirect users. The PDF structure and embedded links point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://3dtechgroup.com/uploads/image/files/kogukalonowixuxosidi.pdf In PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/86c3a43ffb0bbbf18aacba0b7cd5a0e7/kuxusizugovujinukazi.pdfIn PDF document text
    • https://pasarantogel.com/contents//files/71747434253.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090a519656a9---jopuxijavaxenubogewuwu.pdfIn PDF document text
    • http://eastcoastbiker.de/sites/default/files/file/lafokuxosawulumojus.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/85b9c3065ceecbe731208448c83c3495/limodigu.pdfIn PDF document text
    • http://kientrucnhacuagio.com/upload/files/japuzizamazuku.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a159cf37895---32944282493.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/vtuj23ac0vc8ahdcfkf6sa8nn1/xezuwetesazarekaliz.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/d69gnq0t293i6oafhugpomju1d/dotukujesazikivoweveno.pdfIn PDF document text
    • http://asja-doll.ru/userfiles/file/67108052595.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160af6bd656f31---37651975635.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/h46uaf71krhpk1qi5l7ggmavii/tejugenivavuruj.pdfIn PDF document text
    • http://flightshop.jp/images/blog//file/lumegiput.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e331f9864a---79743458319.pdfIn PDF document text
    • http://studioindelicato.com/userfiles/files/24191194845.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16073ff2183eaa---kusagitovokuvegetagutupa.pdfIn PDF document text
    • https://gangwontaxi.com/FileData/ckfinder/files/20210624_FE4D42786AA9F29C.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/16099c530558d2---dulasojopifuwoziweduzofe.pdfIn PDF document text
    • http://tradeweb.es/userfiles/file/98227471271.pdfIn PDF document text
    • https://hostessima.pl/userfiles/file/80393718119.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160703edee578b---77120329709.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=happy+birthday+images+for+friend+with+name+editPDF 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_off0000d6e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eefa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEFA 17536 bytes
SHA-256: 71db2a921a42ee324b93233721e07e39c93e201f5b5bfe6b1dce3337bafbee25
font_02_sfnt_off00011d2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D2C 11232 bytes
SHA-256: d8d2ca02359bbaa72e56d978d33334cff918c0de55c72062ca8065de519f4b91

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