Malicious PDF — malware analysis report

Static analysis result for SHA-256 554f84a383f8bacb…

MALICIOUS

PDF

73.0 KB Created: 2021-09-05 10:08:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 74661659a54e59cf16249a1046498b26 SHA-1: 6128895cfc814f937b0f9e06464bcadafa0b4561 SHA-256: 554f84a383f8bacb12e5d8238f2ae6a143395877be676db63585ed2fad62e54b
196 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to external PDFs hosted on compromised WordPress sites and disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to deliver a secondary payload or phish credentials. The document body is unreadable, but the heuristic firings clearly indicate a link farm designed to obscure the true destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://enotecagaribaldi.it/userfiles/files/bafafapupisitiminagutilef.pdf In PDF document text
    • http://lucidareemantenerepavimentifaidate.it/userfiles/files/66461323096.pdfIn PDF document text
    • http://aite-materials.com/upfiles/file/janudenusesuxeti.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c42f264862e---62741544680.pdfIn PDF document text
    • http://marjoleintje.nl/include/userfiles/medikipesi.pdfIn PDF document text
    • http://mgocsm.in/userfiles/file/pewobelosofatuwo.pdfIn PDF document text
    • http://lottfamilyreunion.com/clients/878857/File/gisukujerabiwavewuwure.pdfIn PDF document text
    • http://www.valathors.com/ckfinder/userfiles/files/76359665365.pdfIn PDF document text
    • http://nothingelsematters.net/pharma/images/files/5438479319.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160736eaf37d0b---31647251400.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/9d53bde5cba6be689a7da78d8a9a0f95/wemoj.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607d60644cd7f---begawulifogokawuviju.pdfIn PDF document text
    • http://studiotecnicomartani.eu/userfiles/files/54112303369.pdfIn PDF document text
    • http://lempreintedubois.fr/userfiles/lempreintedubois.fr/file/25802124870.pdfIn PDF document text
    • http://ohmamakitchen.com/uploads/files/ximifilanat.pdfIn PDF document text
    • http://iviltra.lt/images/files/59553515652.pdfIn PDF document text
    • http://nbkhjc.com/uploads/202107/file/2107242151493184649fi504j36zdr.pdfIn PDF document text
    • http://palyavalaszto.hu/teszt/upload/file/foxetiwobibimadejexozisaw.pdfIn PDF document text
    • https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/ee2c0f36f8489c35a85969afc94ce79b/82867456456.pdfIn PDF document text
    • https://viessmannboilers.ca/fck_upload/file/nusafukisol.pdfIn PDF document text
    • https://mannoorpally.com/uploads/file/48763976574.pdfIn PDF document text
    • http://www.petercar0937494634.com/upload/img/files/falelipafarabaxagonole.pdfIn PDF document text
    • https://gamaconsultores.cl/upload/file/tawowegowakom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=craftsman+pressure+washer+parts+manualPDF 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_off0000bc47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC47 16228 bytes
SHA-256: 01297f648823d40bdab23f71d29269cd770678923ac1074c35bc43e74ba02858
font_01_sfnt_off0000e5dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5DC 10628 bytes
SHA-256: d37bfeae871f8f3e5d791bdf3fb11a87704ec29d353840dabd93977531b0c329
font_02_sfnt_off0000fe11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE11 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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