Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb3a5a99507317ac…

MALICIOUS

PDF

97.8 KB Created: 2021-08-11 02:46:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c13054787fc63f7354bb6ad112f6ef95 SHA-1: 090caaed912e9c71c14f73496655e87f606e0b0c SHA-256: eb3a5a99507317ac3cf3f1adcf9ee363684308efd1cf31f2f7c1150e9c1b8acb
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document that contains numerous links to compromised websites, many of which host other PDF files. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates that the document likely instructs the user to open a password-protected archive, a common tactic to bypass gateway security. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160e411b8a13f7---56013899553.pdf In PDF document text
    • https://finances-canada.com/wp-content/plugins/super-forms/uploads/php/files/bbf0efadef501d4e326c246efb7e3c4b/49347058121.pdfIn PDF document text
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/lrakp6rc66tr92ehgom6s62ln5/52586791782.pdfIn PDF document text
    • https://suativisamsungtaihanoi.net/upload/files/82716617809.pdfIn PDF document text
    • https://www.varishastalari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078cdc0e4397---99949365370.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/591ecebb90a684954750200d752ed0d9/kijelilolez.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/95b9492466377ab00263202dcf9d74a4/83615351543.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/noneje.pdfIn PDF document text
    • http://hesexpo.com/img/editor/image/file/luwukesuneloferadaw.pdfIn PDF document text
    • http://worldprint.su/userfiles/file/40427445285.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/47032727312.pdfIn PDF document text
    • https://msvadba.ru/files/file/37970099031.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160959dbdd1904---pumokivod.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf20d790e01---95674650214.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/9968869a855ffb06d2024b46a0984829/xofuwuzav.pdfIn PDF document text
    • http://vetportonaccio.it/userfiles/files/98105257346.pdfIn PDF document text
    • http://moskvaznaet.ru/upload/files/165316111.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608c27d4b0fd2---13618648342.pdfIn PDF document text
    • http://goodslib.com/userfiles/files/falebugogi.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/1056b27da54b95f3ece58ad8d4eaace6/nafojatekitekub.pdfIn PDF document text
    • http://greece-ex.com/images/blog//file/39336607508.pdfIn PDF document text
    • http://mkpstroitel.ru/upload/files/jogifozifasajidikebi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=localizar+celular+android+pelo+gmailPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001029c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1029C 10708 bytes
SHA-256: 12865765c23e319d2e7f4d4fa6ca0fe36857fbf015e81810d21f6b5d7b4adcd3
font_01_sfnt_off00011adb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ADB 19336 bytes
SHA-256: 5aeec7547acbdb333a3e824bf1f0bbad4d7c5472b2fce6c1ac0104e1faffd5b6
font_02_sfnt_off00014ad5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14AD5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000162e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x162E6 16292 bytes
SHA-256: f09c8797b3407a7ae6b0a63cd751999c179569904d1ea398d13f7d7573028793

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