Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a5022902fcff25f…

MALICIOUS

PDF

90.6 KB Created: 2021-09-07 23:24:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: e9f0974bfa0f54fee0876cedf8cd41a8 SHA-1: 5432b8d260e2c03f989e67b94dddcb369b3c622c SHA-256: 1a5022902fcff25f5a09754496d924d43f18e0c14f99c3e3548a9b36214b866a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript, which is a common technique for delivering malicious content. The file also includes numerous external URIs, many of which point to compromised websites or link farms, suggesting an attempt to redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://krisoc.ru/uplcv?utm_term=factores+de+riesgo+en+el+embarazo+adolescente+pdf PDF link annotation
    • http://www.yeosung21.or.kr/ckfinder/userfiles/files/1627948720.pdfIn PDF document text
    • http://studiotecnicopetrillo.eu/userfiles/files/zejaguwa.pdfIn PDF document text
    • http://fw-simple.com/uploads/files/xoxemudog.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160724404a5b7d---30514230415.pdfIn PDF document text
    • http://probeg2000.ru/files/userfiles/files/3367222870.pdfIn PDF document text
    • http://to-kajihan.net/js/upload/files/54073758306.pdfIn PDF document text
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/2cbad99063c3b650f2859b1b8c53d72b/tugurogifapikinanil.pdfIn PDF document text
    • http://caigeshi.com/uploadfile/file/2021070720461673499.pdfIn PDF document text
    • https://cleartunemonitors.com/ckfinder/userfiles/files/dipojuzekudelenokeb.pdfIn PDF document text
    • http://xn--aknmedikal-yub.com/uploads/file/62283514747.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16091dabbd9192---96796949130.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a81ec847ea.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160db7ee7c28ef---kanujabotabulabaporin.pdfIn PDF document text
    • http://linza-market.ru/upload/files/54804870709.pdfIn PDF document text
    • https://radmangroup-ye.com/rgfiles/file/derunuxopuzutafolonod.pdfIn PDF document text
    • https://shevian.com/images/file/735505898.pdfIn PDF document text
    • https://dianthusindustrial.com/resimler/files/gupitetibotukigitarus.pdfIn PDF document text
    • http://www.truca-taoules.com//ckfinder/userfiles/files/44061582310.pdfIn PDF document text
    • http://peggylittlelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sigefuzukij.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/m9chi44fi882mcqhcva2rn7p8r/1108697442.pdfIn PDF document text
    • http://mimarkamilozkartal.com/userfiles/files/tigelad.pdfIn PDF document text
    • http://hotelgiottotorino.com/userfiles/files/54131187276.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160796facd17db---funetobugipi.pdfIn PDF document text
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/0a8b8c885eef2d01b419664361832731/tamudeli.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_off0000f698.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF698 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010eaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EAF 11140 bytes
SHA-256: be5dcca4a16c5de0cce4dd0f2c557de32c0d6862afe19cbfaa65a96ac3f36b73
font_02_sfnt_off00012843.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12843 19724 bytes
SHA-256: 74b0cb474f4ebdd317d041ba022df730707b45e69ec07ec02e9d43c285240bb9

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