Malicious PDF — malware analysis report

Static analysis result for SHA-256 69a37b1cd9d02226…

MALICIOUS

PDF

78.1 KB Created: 2021-09-05 14:48:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e788f5e6b1ed4d2a23936f89d72e8194 SHA-1: 00d9611366ff5bb03042940aff683c81e9e6006c SHA-256: 69a37b1cd9d022266d6ab1881478b99d8dc016888b100c6efbba9016a964d26a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript, which is often used to redirect users to malicious websites. The numerous external URIs, many hosted on compromised WordPress sites or disposable domains, strongly suggest a phishing or malware distribution campaign. The ML classifier and ClamAV detection further confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://smidgel.ru/uplcv?utm_term=trigonometric+functions+rules+pdf PDF link annotation
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612412a286d9b---25935662421.pdfIn PDF document text
    • http://blackivy.pl/userfiles/file/xozenojugogujalixinika.pdfIn PDF document text
    • http://niengrangchuyensau.com/upload/contentFile/file/62518264435.pdfIn PDF document text
    • http://progetec.org/userfiles/files/89489622170.pdfIn PDF document text
    • http://shyjjc.com/v15/Upload/file/202188456559246.pdfIn PDF document text
    • http://phuwangnam.com/user_file/file/37604890464.pdfIn PDF document text
    • https://faceless.me/userfiles/files/mokikabugogutobobivubelej.pdfIn PDF document text
    • http://stcforanebanglore.smcim.com/www/js/ckfinder/userfiles/files/zosozizu.pdfIn PDF document text
    • http://bevelec.com/bevelec/dossierMois/file/1482653416.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607f086147c15---mepodagolixojurapop.pdfIn PDF document text
    • http://amajyuku.com/files/files/47684373176.pdfIn PDF document text
    • http://chithanhplastics.com/uploads/userfiles/file/xeken.pdfIn PDF document text
    • http://alltechsro.cz/files/91312145888.pdfIn PDF document text
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/62df01b2a159f1ec388309d63dcd7b47/65843042881.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1609828477c981---bakozelojaxeruradumiwuvil.pdfIn PDF document text
    • https://pametnidom.hr/pametne_kuce/userfiles/file/javaderat.pdfIn PDF document text
    • https://sambelteri.com/contents/files/48221705718.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/riuchpla2865mgpsp53liusu1d/luziparedo.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160743322704e8---lorofu.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608122ab33a7b---4821846982.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160abba1562093---bedojunuduvu.pdfIn PDF document text
    • http://air-con.ru/upload/files/58918091431.pdfIn PDF document text
    • https://mldom.xyz/web/img/podborky/files/33277471233.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210628134602385.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/m0gocl5so78gvgmg9sh9ucgopg/48295977526.pdfIn PDF document text
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/ruxefuwamekorilajugimi.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_off0000c97d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC97D 18288 bytes
SHA-256: 970996233816f3693d67bfec2d01b18fb65ea0e7b6bfcd7553b6c837bb5c95f7
font_01_sfnt_off0000f993.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF993 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000111aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111AA 10864 bytes
SHA-256: 3dc5733fb74eda3c87ba7f346587427b4bd71d6b209ff0fa1f8fee83e3c00d79

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