Malicious PDF — malware analysis report

Static analysis result for SHA-256 81e5bcc15334d2af…

MALICIOUS

PDF

89.0 KB Created: 2021-09-09 06:00:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e5bf4dfab45cf2d4ca34f4a9d3dac67d SHA-1: c9ba0eabad02d0e67c32109584869b909e9f8c67 SHA-256: 81e5bcc15334d2af61a3630f747b0429a7d27a82e8697314a6b1edcabd80ad02
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.012 Process Injection T1204.002 Malicious File

The PDF document was flagged by ClamAV as 'Pdf.Phishing.Trojan' and ML classifiers indicated a high probability of maliciousness. It contains numerous links, many pointing to compromised WordPress upload storage and disposable hosting, suggesting a link farm designed to redirect users. The presence of multiple external URIs and the 'link farm' heuristic strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://marikakozmetika.hu/editor_up/modimifasimu.pdf In PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/161321cbf30a4f---xikiw.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/16132c920e78ce---57166521556.pdfIn PDF document text
    • https://veaodaibrahma.com/uploads/image/files/bejake.pdfIn PDF document text
    • http://fkm-lux.by/var/upload/file/funonavupiramarogutonax.pdfIn PDF document text
    • http://qualityspices.in/ckuploads/files/79230439351.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/kazuduwukinusutadatixiru.pdfIn PDF document text
    • http://ilyxrace.com/userfiles/files/demutafojosovi.pdfIn PDF document text
    • http://itagqatar.zajeltel.com/itag/file/files/79524491409.pdfIn PDF document text
    • https://luatsubienhoa.com/upload/ck/files/48090067288.pdfIn PDF document text
    • http://ever-pioneer.com/upload/files/xikudifevunadupali.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/31e6cb59ac7b032a59fd3a2e1942a534/fodezawuxasof.pdfIn PDF document text
    • http://mtsp.by/userfiles/files/teparidopofavarede.pdfIn PDF document text
    • http://tpokebar.com/uploads/files/19389748623.pdfIn PDF document text
    • http://studiodispirito.it/userfiles/file/dofubovidabodajasu.pdfIn PDF document text
    • http://minhnguyenvn.com/uploads/userfiles/file/tuxawaloxuboxibelale.pdfIn PDF document text
    • http://dangkykinhdoanhkiengiang.com/upload/ck/files/jevoxenoxoxanigexiwezu.pdfIn PDF document text
    • http://kriosispl.com/cote_dor_import/admin/ckfinder/userfiles/files/vamagufiri.pdfIn PDF document text
    • http://sushinamu.com/uploads/files/32000012753.pdfIn PDF document text
    • http://underbutter.cz/download/foto/buwumoruvegakufizekez.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/fixogudugajuj.pdfIn PDF document text
    • https://appchecar.com/ckfinder/userfiles/files/6123115600.pdfIn PDF document text
    • http://www.kowel.com/ckfinder/userfiles/files/1630629103.pdfIn PDF document text
    • http://sitoad.com/bbqjoekey/files/202109041318412284.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=gta+5+lite+apk+obb+download+for+androidPDF 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_off0000f187.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF187 19572 bytes
SHA-256: c92fb21edad5b6fe9cc661e8428790b3667f2b72545b85885d27f1cfd7724a5d
font_01_sfnt_off000124e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124E8 10816 bytes
SHA-256: be03ce4a4f09dc2b901a01c78c190e887001fa1a16177d45f69479bc831c3970
font_02_sfnt_off00013ddb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DDB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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