Malicious PDF — malware analysis report

Static analysis result for SHA-256 86e3e7ed3a186500…

MALICIOUS

PDF

82.2 KB Created: 2021-09-20 13:21:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 8c84dc4274b27f9ff9c1747b7b034b27 SHA-1: d18da305299466794c3367ba5fc6ae8578b244eb SHA-256: 86e3e7ed3a186500f1efd5b0e909fd8064248c3ab414d509de73fc0770dce338
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The document contains numerous embedded URLs, many pointing to compromised CMS upload storage or disposable hosting, suggesting it functions as a link farm designed to redirect users to malicious sites. The presence of these links and the overall structure strongly indicate a phishing or malware distribution attempt.

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://synerhu.ru/uplcv?utm_term=minecraft+server+pc+and+mobile PDF link annotation
    • https://apotekatia.ba/fajlovi/mexopo.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613b8d395c340---10784859308.pdfIn PDF document text
    • https://china-glass-mosaic.com/userfiles/files/20210902_080521.pdfIn PDF document text
    • https://morganmethod.com/ci/userfiles/files/472675570.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16141d87f0857f---7681383111.pdfIn PDF document text
    • http://detskaoptika.cz/ckfinder/userfiles/files/vufaburikibusukisara.pdfIn PDF document text
    • https://wecareprogram.org/images/file/74854529949.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16131726b04e92---paputuwivemoxotozej.pdfIn PDF document text
    • https://inprovitecuador.com/ckfinder/userfiles/files/turisa.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/c28005445de3baebb2d03c716e176fd7/jufiruvog.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/79193969342.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/161315ecda0b87---wegom.pdfIn PDF document text
    • http://geosond.pl/userfiles/file/gozoz.pdfIn PDF document text
    • http://thesprotia.gr/uploads/file/sobatovimoxixiv.pdfIn PDF document text
    • https://tybistanbul.org/resimler/files/98928719579.pdfIn PDF document text
    • http://telektrans.hu/editor_up/77812993123.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/16134768b7d263---14049736865.pdfIn PDF document text
    • http://ngnjl.com/userfiles/files/79675565589.pdfIn PDF document text
    • https://f27szerviz.hu/upload/files/94838645623.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130e82a64f84---zopoletovazamilosivofu.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/42155223bcd7c747afafa55d01c0463b/98075204914.pdfIn PDF document text
    • https://tahitotfalu.hu/ckfinder/userfiles/files/86652409715.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_off0000d993.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD993 10980 bytes
SHA-256: 8b62f8c3e7f1b15a67ceaddf63cc50e77932f3432be6995a077295a4b7383dc0
font_01_sfnt_off0000f2d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D6 18700 bytes
SHA-256: b0e98295a4b6c8e5022876d17bbcadbfefe40df939ef086da79933f4b22653bf
font_02_sfnt_off00012307.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12307 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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