Malicious PDF — malware analysis report

Static analysis result for SHA-256 df16573445b46211…

MALICIOUS

PDF

92.2 KB Created: 2021-07-24 17:11:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c33fb945dc80066b8b4a8b633c7ec78b SHA-1: a6f29f14b2e8c9485941cf974377f33ccc8127a3 SHA-256: df16573445b46211add6064538a0fe685429b6772f4c88e9f859c165a8bffe4c
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document functions as a link farm, containing numerous URLs pointing to compromised CMS upload directories and disposable hosting. These links likely serve to distribute further malicious content or lead users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9931

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://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160836194819f0---605205291.pdf In PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aff5b22635---72708932865.pdfIn PDF document text
    • http://timnhanhonline.vn/upload/files/duwefatoxa.pdfIn PDF document text
    • https://bamor.org/userfiles/file/webexovobobunez.pdfIn PDF document text
    • http://formel1vermietung.de/userfiles/file/26588048733.pdfIn PDF document text
    • https://syntellect.ru/Repository/file/divatokanemizijewixikuso.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/brdbh7fljhv7o16cnqa0vcq40d/jepovapebadipajijafuvap.pdfIn PDF document text
    • http://rhodeislandalpha.com/clients/56223/File/xuzaxuxenovud.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/dc339cf4a7e3a738a82c8e82c7b9ef02/luvaxilom.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ae1f702cf76337f2c4781eba77a7ac9a/32017728355.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/6e7ca283b94dd15309addebe0079db60/pikabupejakudusu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea3c49a61b---gunob.pdfIn PDF document text
    • http://studiocastigli.eu/userfiles/files/18455713096.pdfIn PDF document text
    • https://digiconelectronics.com/media/ditokekapem.pdfIn PDF document text
    • http://yilip.net/userData/board/file/11551228242.pdfIn PDF document text
    • http://mvclassof1990.com/clients/8/8c/8ca0ba2c7a07c5cd1f21f9fc323c16c5/File/lilirafakakidalari.pdfIn PDF document text
    • http://thesetnews.com/images/fckeditor/file/xozudugimepulepufejom.pdfIn PDF document text
    • http://samsung-service-center.ru/uploads/files/54796847598.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608786ea9bce8---tabak.pdfIn PDF document text
    • http://ha-sine.com/d/files/96489199551.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16080248f540ee---metusowoj.pdfIn PDF document text
    • https://pensiuneavlasin.ro/wp-content/plugins/super-forms/uploads/php/files/h56038r0s3btdnoqbdvr1vvu79/24656641992.pdfIn PDF document text
    • http://www.deewanalarab.com/up_imgs/relupojutenob.pdfIn PDF document text
    • http://zangerlelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/22420800393.pdfIn PDF document text
    • https://muahohangnhat.com/app/webroot/uploads/files/21831742742.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=fifty+shades+darker+hindi+dubbed+movie+downloadPDF 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_off00010167.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10167 11196 bytes
SHA-256: 02364b3a7026b24401c4a57da27a1c942291fbab50bf73726f24a229ce2e6205
font_01_sfnt_off00011b73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B73 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013385.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13385 17556 bytes
SHA-256: c660f86f580cd41ec51986a397620afa66d68fe2ab8f2a02e11e73b0cd38f6cd