Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b1355c72085fec4…

MALICIOUS

PDF

74.9 KB Created: 2021-09-16 12:12:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 61b784ef72b411f19bc93bea557d4424 SHA-1: ca8263145793d12a70181dfdb26dadf35f66ac39 SHA-256: 1b1355c72085fec4cc3755a645255d669a3952fca1afccf255c05194531d9fc7
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many hosted on potentially compromised or disposable domains, indicating a link farm or redirection strategy. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The presence of multiple PDF link farm heuristics reinforces this assessment.

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://studiotecnicostradi.eu/userfiles/files/xenirariluvono.pdf In PDF document text
    • https://adikmanis.com/contents/files/sapis.pdfIn PDF document text
    • http://medob.org/SITE/files/editor/file/wimulabixebiw.pdfIn PDF document text
    • https://wyslijpaczki.pl/app/webroot/files/userfiles/file/19016949363.pdfIn PDF document text
    • http://www.yemany.com/yemfiles/files/jajipaxavifoxutudim.pdfIn PDF document text
    • https://aakritidigitals.com/userfiles/files/jasid.pdfIn PDF document text
    • http://eaas-journal.org/survey/userfiles/files/26540587973.pdfIn PDF document text
    • https://ip-kamera-rendszer.nuttydog.hu/ckfinder/userfiles/files/74761182970.pdfIn PDF document text
    • http://ckattorneys.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gukuvolofit.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ae406ddcdc---lijexitodimivolawokomiso.pdfIn PDF document text
    • http://kbchina.de/upload/bakomalorewev.pdfIn PDF document text
    • http://kmbb.at/userfiles/file/97764766834.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613bf71b742e9---87464472765.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/6ca5084108d257c7b45fc9070d4f9c18/74565667653.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614171197a969---98036679953.pdfIn PDF document text
    • http://uniradioweb.info/userfiles/file/kadelegimivi.pdfIn PDF document text
    • https://braus.uz/images/shared/file/79827730325.pdfIn PDF document text
    • http://praguetransfer.com/files/file/27585068758.pdfIn PDF document text
    • https://marblobaths.com/app/webroot/img/files/20162952664.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/116ad8d8830935b16df00e1836d178e1/zagifexesarak.pdfIn PDF document text
    • http://bxbrdh.marketsearching.com/upload/files/sorelasa.pdfIn PDF document text
    • http://eltdb.com/UserFiles/files/16663885081.pdfIn PDF document text
    • http://myappartement.de/web/editor/files/44946216715.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=a+quiet+place+2+aboutPDF 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_off0000c2c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2C1 10480 bytes
SHA-256: 576ff3088acc47828a753055d9e9a00bc92255fba2e1af4d7076895af5ed2f79
font_01_sfnt_off0000da8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA8E 16812 bytes
SHA-256: c3ba06f56daa631614d29253dcdb145ede385641068dd18d71835fa6a37f074b
font_02_sfnt_off000105bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1