Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5a5ee386d78bcf9…

MALICIOUS

PDF

88.1 KB Created: 2021-08-06 10:25:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 324c591ebbd4ff8b26fe5020909708df SHA-1: 4b3f2596fa5a53aa9dae36c950e69985ce99d742 SHA-256: f5a5ee386d78bcf95a20e5f66fe5990db1c0278c9e54e4d1c83a34118bea3cd2
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress upload directories, suggesting it functions as a link farm designed to redirect users to potentially malicious content. The presence of multiple distinct hosts and UTM parameters further supports the idea of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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 http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7ea2b957e---92745637238.pdf In PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/91289925bdc457a2f831633bd342e6c5/97996488548.pdfIn PDF document text
    • https://hazeloyun.com/calisma2/files/uploads/sapizeluxes.pdfIn PDF document text
    • https://dianthusindustrial.com/resimler/files/85367103047.pdfIn PDF document text
    • http://castel.lu/userfiles/files/55992674499.pdfIn PDF document text
    • https://juhaszautovill.hu/userfiles/file/popunepu.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/2bb4855fb42674a1fe185ae5c6404430/18626269371.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071453a9a6c6---29656195638.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/adbb9819502d0e027ab66103539df780/lusopixamunasafevenub.pdfIn PDF document text
    • https://brune-schmuckwerk.de/ckfinder/userfiles/files/72303960884.pdfIn PDF document text
    • http://hainescentreasia.com/images/file/jonovifaxosorixagaxa.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b3b2f88ecde---45799780034.pdfIn PDF document text
    • http://barcelonasixtytwo.com/userfiles/file/vugopipopebetolamexozuti.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16091e07105bed---xugagubaguluvixova.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/rvne72abp28t8m3ekb4jso8s63/736728848.pdfIn PDF document text
    • http://anatolianlgs.com/userfiles/file/75925418551.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/vb0d8qr1rb871ke8a2e0bkhh5o/jovuzopukojulokul.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6e9a5734eb---81798044998.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4c250984d3---80948285660.pdfIn PDF document text
    • http://0-50.ru/userfiles/file/zesumipuluzaxum.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///zikotu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+report+fake+items+on+ebayPDF 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_off0000f37f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF37F 17744 bytes
SHA-256: 8111bb701cea87fe2521b264dceb0aa62f44c8186d25d7f3e7e1ff3aef136b17
font_01_sfnt_off000121f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013a09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A09 10896 bytes
SHA-256: e5e5a74689ad0f31e1596866d299868e8acc048bd7f264279f1af338a9bd1cd4

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