Malicious PDF — malware analysis report

Static analysis result for SHA-256 f19851f5ef659de7…

MALICIOUS

PDF

88.7 KB Created: 2021-09-10 23:34:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 44362ebba75142828509a05cbc1263ca SHA-1: b84ffe8a226bf375f87483ac15e0cf85b0799efb SHA-256: f19851f5ef659de76d4c7a71672794d9bbd3c14c6ec19167c22c378bdd0c8dfe
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to disposable or potentially compromised hosting domains. The presence of external URIs and link farm characteristics suggests an attempt to redirect users to malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://dep14kirov.ru/userfiles/file/wejukuzazafiwopepemaro.pdf In PDF document text
    • https://mclandpin.com/calisma2/files/uploads/37636292349.pdfIn PDF document text
    • http://escrima-rlp.de/userfiles/file/4920442500.pdfIn PDF document text
    • https://tfsroanoke.com/home/tfs/public_html/new/ckfinder/userfiles/files/31739405709.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/41756922714.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612f341292601---soxuxugebe.pdfIn PDF document text
    • https://erdenet.mn/userfiles/file/23940065179.pdfIn PDF document text
    • http://celyroknaterase.sk/editor_uploads/system/files/dazupekumana.pdfIn PDF document text
    • http://christopherspubandgrille.com/userfiles/files/jipanixubenaxun.pdfIn PDF document text
    • http://czpohledavky.cz/userfiles/files/17993635012.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613bbe487b779---98972446374.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131a8b4cc20b---55555998370.pdfIn PDF document text
    • https://wupaojichangjia.com/d/files/sejudevigon.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131d05463cf8---mopobepumugofuf.pdfIn PDF document text
    • http://sandlnae.com/data/editor/file/favasedakalu.pdfIn PDF document text
    • https://goodline.by/userfiles/file/nifesanug.pdfIn PDF document text
    • http://ssteelelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gusejapatulalelerak.pdfIn PDF document text
    • https://maggies-handmade.com/UserFiles/files/mowanogagesile.pdfIn PDF document text
    • http://bestbelly.org/content/files/files/wivemot.pdfIn PDF document text
    • https://betalinktech.com/blmedia/file/81980022565.pdfIn PDF document text
    • http://ipceurope.com/assets/file/11312697484.pdfIn PDF document text
    • https://shibbirs.com/media/files/13864078894.pdfIn PDF document text
    • https://airxps.com/userfiles/files/xupeduv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=hex+based+strategy+games+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_off0000f88d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF88D 16760 bytes
SHA-256: 2594466d58e9e41fa880aa03e750dbf38d1327fe7c85d30a4a15208a4084efbd
font_01_sfnt_off000123ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123EA 10892 bytes
SHA-256: 3e20ad3bef40ef1221a225ce3e95b53e4d7b4b3480100b4d5b59ee31f459f0d9
font_02_sfnt_off00013cea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CEA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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