Malicious PDF — malware analysis report

Static analysis result for SHA-256 b817472c5fe98c14…

MALICIOUS

PDF

87.9 KB Created: 2021-08-13 16:48:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: d821c8fbf3c5ad57ff905dd4669f5dff SHA-1: 7ade2e596ce3acbc50be625c26065c7955e0cf33 SHA-256: b817472c5fe98c14a03eb4b67153a3e89c1e3636a1806905614f18b0296b34f3
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/ce5ce019636182a0b910db8902d11f43/79198782512.pdf In PDF document text
    • http://www.hausbaumesse.at/ckfinder/userfiles/files/39406981704.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085875e33768---vexanoxuporedixuredimu.pdfIn PDF document text
    • http://tasarimak.net/ckfinder/userfiles/files/gapijorizukezowari.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/53470315918.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/guvovexewotapurok.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160c6925aa4084---19757575959.pdfIn PDF document text
    • http://triatlonbizuterie.cz/sites/default/files/file/88790570245.pdfIn PDF document text
    • https://vanvoorst.info/uploaded/file/80440225177.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091b7682d2cd---13087660423.pdfIn PDF document text
    • https://soudurelauziere.com/upload/editor/file/guzewigenibokodoxiv.pdfIn PDF document text
    • http://primethailand.com/ckfinder/userfiles/files/dopetubigixijudokefurisiw.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/grphi5qogi7ge7a3dr0n36o0j2/lokidopuxaritakaxu.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/sawizifaponevanifemuv.pdfIn PDF document text
    • http://proxima-design.cz/files/file/darufevumusek.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5d82a30e8d---30917904469.pdfIn PDF document text
    • http://toshiteriyakiburien.com/uploads/files/22250186621.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/jefuzapuwiwusepokevovovom.pdfIn PDF document text
    • http://soeurs-scjboran.fr/soeurs/upload/files/36945593111.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/92507274870.pdfIn PDF document text
    • http://hart-metale.pl/gimnazjum/userfiles/file/94830261596.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1611653aa6e572---zamesumudonij.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/7lddq3gpdde43c8061r2nj7ebf/retugezumejafelodebufina.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+age+griswold+cast+ironPDF 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_off0000f121.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF121 17680 bytes
SHA-256: 9e5cf0574f3f343e0f30ed85bdf9b0366d9514019694d671ea289b4c62920f7b
font_01_sfnt_off00011f45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F45 10624 bytes
SHA-256: f68b7cf8120e20059f00acfa8cc699544323564dd4b8aa07274f961d67353e3c
font_02_sfnt_off00013782.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13782 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1