Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8bd36c5ac65c7c4…

MALICIOUS

PDF

80.8 KB Created: 2021-09-07 09:17:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 514d67d0fed5bd248b5b5d6da67cdff3 SHA-1: 0cb8d30be3ebe25bb45bd3a1f17929053421b3f6 SHA-256: b8bd36c5ac65c7c41d75b5559065f4662bed1ecd814fe0c92e878d8a29f3ee0f
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to redirect users to malicious or phishing content. The presence of external URIs and compromised CMS upload links indicates a pattern of leveraging vulnerable web infrastructure for malicious distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 https://cructi.ru/uplcv?utm_term=tipos+de+calentadores+solares+pdf PDF link annotation
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a436cd0373---94364532200.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609a93130f2dc---91145790852.pdfIn PDF document text
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/5fb915dca60c1372e355fa7041b3205b/pegadupewetotedepuwizimi.pdfIn PDF document text
    • http://haumeaonline.com/userfiles/file/zeluduxegigitubanufosapad.pdfIn PDF document text
    • http://puzynowska-kancelaria.com/userfiles/file/28567993615.pdfIn PDF document text
    • http://hzdsbg.com/uploadfile/1627252222.pdfIn PDF document text
    • https://lifesmart.ro/ckfinder/userfiles/files/pirenez.pdfIn PDF document text
    • http://tele-video.ru/upload/files/18122153038.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/19db63d11fe754e67120f8dec15eceea/xotamesuvuzebun.pdfIn PDF document text
    • http://xn--82cac8d3ajrc0gd0bo4a7nf3qg.com/userfiles/files/10413812201.pdfIn PDF document text
    • http://dribblebar.pl/userfiles/file/70908715606.pdfIn PDF document text
    • https://szekszardportal.hu/userfiles/file/76520193386.pdfIn PDF document text
    • http://asiancfea.org/userfiles/file/pitajowelafafowod.pdfIn PDF document text
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/0a0b9eea32be8d9bc120648173c6e5b3/tebadusinusikasigijum.pdfIn PDF document text
    • http://tuclubcr.com/campannas/file/79889774742.pdfIn PDF document text
    • http://newbusan.net/FileData/ckfinder/files/20210728_EAD7B4485F3147AD.pdfIn PDF document text
    • https://immo-cjeanpaul.lu/userfiles/files/zolaverobufejakorukore.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609062e449f61---morerumiwabokenuzet.pdfIn PDF document text
    • http://thingsantiquesla.com/userfiles/files/zapizumubepinuxiwimizapa.pdfIn PDF document text
    • http://gw73patriots.com/clients/1/1e/1ed986c9d410becccfd9995a8318e329/File/3636205465.pdfIn PDF document text
    • http://naszymsladem.pl/upload/file/waxugowiritiwigafawe.pdfIn PDF document text
    • http://korealabels.com/ckfinder/userfiles/files/jizurizovikuvale.pdfIn PDF document text
    • 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_off0000d981.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD981 17244 bytes
SHA-256: b4be38a824ae4f89d34352de147e8d7344e8fa01d8ea214953cf2e8e6ff076cd
font_01_sfnt_off00010525.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10525 10576 bytes
SHA-256: dbac85a33e78e31f4b31c3740435eafa7b887984f23b725a4354d3d1cc71ea3d
font_02_sfnt_off00011d69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D69 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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