Malicious PDF — malware analysis report

Static analysis result for SHA-256 06905486bb22de87…

MALICIOUS

PDF

84.7 KB Created: 2021-09-16 03:48:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a22595a52cef0a930b86dd337534d174 SHA-1: 910a3971931848698a4cd9a26b06ad2ee65312e0 SHA-256: 06905486bb22de87f6d36863fcd1ee9e7ec32319666f79d414414762d4d524dc
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous external URIs and link farm heuristics, suggesting it is designed to redirect users to potentially malicious websites. The presence of multiple compromised CMS upload links and disposable hosting further supports a phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://chcial.ru/uplcv?utm_term=youcut+video+editor+for+pc+download PDF link annotation
    • http://kzlo.pl/fotki/fotki/file/45493931186.pdfIn PDF document text
    • http://aquitaine.annuaire-regional.com/ckfinder/userfiles/files/73101879420.pdfIn PDF document text
    • http://keralastatetailorsassociation.com/userfiles/file/gobiranotinebolim.pdfIn PDF document text
    • http://maturitni-ples.eu/UserFiles/File/66605772060.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1613f1a0725120---muvavujizikerulezo.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/42348644527.pdfIn PDF document text
    • https://e-ssuances.com/ckfinder/userfiles/files/19575417354.pdfIn PDF document text
    • http://zvezda-rostov.ru/ckfinder/userfiles/files/redivumixeraxuwemop.pdfIn PDF document text
    • https://calendarsunrooms.com/userfiles/files/2165277295.pdfIn PDF document text
    • https://calendarsunrooms.com/userfiles/files/41766212471.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/e7cd27e9e2dd83c5495d77b66a3115f1/pujekokalukojizowere.pdfIn PDF document text
    • http://appinaris.net/ckfinder/userfiles/publics/files/3943845950.pdfIn PDF document text
    • http://fli.edu.mn/ckfinder/userfiles/files/ketudasutitekasasupal.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613ea636c8b80---86762243414.pdfIn PDF document text
    • https://aynispirit.nl/userfiles/file/dewojep.pdfIn PDF document text
    • http://abwlondonblvd.com/uploads/files/59500123366.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/fd2a0473d823b21352839967b366d42b/wujavevemanu.pdfIn PDF document text
    • http://sksound.com/userfiles/file/vapagixidobofuxukesuxa.pdfIn PDF document text
    • https://art-gallery.mn/uploads/files/49946851193.pdfIn PDF document text
    • http://revize-elektro.info/UserFiles/File/siropazut.pdfIn PDF document text
    • https://narellesastro.com/userfiles/files/13496078753.pdfIn PDF document text
    • https://tecnibat.net/uploads/archivos/49652928766.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/c7f7636c93c4cce8ef0f86e1fccf669e/77045054917.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_off0000e55f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE55F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD71 18468 bytes
SHA-256: 6f34db1f75757198e9d9a69373c5481e525916d93c943a32f7604851ab18799b
font_02_sfnt_off00012cce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CCE 10680 bytes
SHA-256: 58f7327dabd0f90f5cc06e2c09c6b18a3dad08f3c021a65cc80743244b1317e4

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