Malicious PDF — malware analysis report

Static analysis result for SHA-256 97aa727e1cfe9e23…

MALICIOUS

PDF

69.6 KB Created: 2021-09-08 10:58:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 715da2b6e29372804bb920e32617958f SHA-1: 0ac6158376c706880bf8bf0be2d581e0eca6b77c SHA-256: 97aa727e1cfe9e23f8ae5b9da2f40a8ea75d50d49fcdfed29452c557fdf305a0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, a common technique for executing malicious code within PDFs. It also features a link farm pointing to numerous URLs, many hosted on potentially compromised websites, suggesting an attempt to redirect users to malicious content or phishing pages. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://pixomot.ru/uplcv?utm_term=du+sixth+cut+off+2018+pdf PDF link annotation
    • http://holidayinntorino.com/userfiles/files/61517602827.pdfIn PDF document text
    • http://goopenapp.com/uploads/files/87937267712.pdfIn PDF document text
    • http://tipiland.net/upload/file/fupikemufejurudavetasota.pdfIn PDF document text
    • http://healingtown.org/userData/board/file/vavivisoxudazisoraxijime.pdfIn PDF document text
    • http://tcurryproperties.com/konadnew/userfiles/file/mejafafe.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160d2cf45ae411---34828995769.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076373d7b7e6---lepizipidevivexizepuzoka.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/b5855fcab1eab64e64dba0856cb199fa/dukivumatulutog.pdfIn PDF document text
    • https://clubberia.com/js/ckfinder/userfiles/files/selowogomowakikorure.pdfIn PDF document text
    • https://capitalsyndic.com/userfiles/file/mipitidepejiturewa.pdfIn PDF document text
    • https://laurallo.com/ckfinder/userfiles/files/9107943952.pdfIn PDF document text
    • http://duocthientam.com/uploads/ckfinder/files/36810182866.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/4901750f848e116856db14e0ce582341/35051510441.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608355e1ee701---limiwedanevojig.pdfIn PDF document text
    • https://renhedc.com/uploads/files/202108131535124515.pdfIn PDF document text
    • http://dirpub.org/editor/ckfinder/userfiles/files/lapul.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/160e63d6d46447---46202690984.pdfIn PDF document text
    • https://cutandcolorparrucchieri.it/file/kagururekuxiwijosutibeb.pdfIn PDF document text
    • http://innotec-industrie.be/userfiles/file/65702073613.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/vujaluvisubemute.pdfIn PDF document text
    • https://www.m2asolutions.com/wp-content/plugins/super-forms/uploads/php/files/258c9cfffbfbda869952210c13dba693/tazojugazikuzovuwago.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_off0000b1d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c9e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9E9 15012 bytes
SHA-256: 06505c46e4d4fd2721f3e27adfebd58ffa5f7d13d7978310e6ec50fdbe87d39a
font_02_sfnt_off0000ef81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF81 10880 bytes
SHA-256: 9b7b0b888b47f83244812c2536036e707940345d839e4621d7204ca9f6992a22

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