Malicious PDF — malware analysis report

Static analysis result for SHA-256 32b995bc8bf20d0b…

MALICIOUS

PDF

88.3 KB Created: 2021-08-05 21:31:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ff76edf8d22fdbff182bcb621514de66 SHA-1: 2544a28b45e0b24c358ef456d7b010a154f74c3a SHA-256: 32b995bc8bf20d0b9d7234dd92a5bb8c117d99593ae4bc468819f05b01cdf706
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF that contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of PDF_RANDOM_URL_LINK and PDF_SEO_DISPOSABLE_LINK_FARM heuristics suggests the document is part of a link farm designed to redirect users to potentially malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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 https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6814e013dc---bepamixonuxivufebibaguxo.pdf In PDF document text
    • http://backupcenters.com/userfiles/file/4487559808.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/9emp55g6mspanalpg362avobu6/katiwogoko.pdfIn PDF document text
    • http://wrtour.com/FileData/ckfinder/files/20210703_596DBC8E3DC91F28.pdfIn PDF document text
    • http://aptchasers.com/FCKeditor/userfiles/file/buviki.pdfIn PDF document text
    • https://menu2uplus.com/images/file/12348140898.pdfIn PDF document text
    • https://tktravelkorea.com/FileData/ckfinder/files/20210706_7361E9CCF2BF0D66.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084461c73df2---99109939642.pdfIn PDF document text
    • https://sieompaysdebray.fr/lesiom/txt/imgadmin/file/30685379666.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608131e97e8be---likiwupenez.pdfIn PDF document text
    • https://bladmedyczny24.pl/wp-content/plugins/super-forms/uploads/php/files/17f4d3d5ad648d70267e3428dace87cd/43891133006.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073d3aeccea8---zidivubidajeju.pdfIn PDF document text
    • http://ever0036.com/assets/uploads/ckedit/files/20210602093041.pdfIn PDF document text
    • http://immobiliareborghi.com/userfiles/files/5768186987.pdfIn PDF document text
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/356ab2c32b76f212b7a0cd9bc94a4796/ripijetesijugejewepef.pdfIn PDF document text
    • http://fujiya-la.com/uploads/files/67381964019.pdfIn PDF document text
    • http://deccanquest.com/konadnew/userfiles/file/nulafepobaviroredamu.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078c52c2ee37---87936773015.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160918fb1bc683---19215068474.pdfIn PDF document text
    • http://cphs1970.net/clients/877309/File/97170733023.pdfIn PDF document text
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/2028014524.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160987969a394c---vevamobolimakomide.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/0b7ac6678d7b9a4d2d9fc4127f2b27f3/sujawurawifizos.pdfIn PDF document text
    • http://chpcentre.com/files/file/6469670273.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=can+i+arrange+an+uber+ride+for+someone+elsePDF 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_off0000f370.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF370 10868 bytes
SHA-256: 02145c3f6fe87a1f211e62e0d197ed363a8281ffc2e23a9d2299807272157a3c
font_01_sfnt_off00010c4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C4A 17444 bytes
SHA-256: 8497a43d4883a9faee96bce9a41a64899dd46ecc35288c7c6eca79938baa1a74
font_02_sfnt_off00013a13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A13 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1