Malicious PDF — malware analysis report

Static analysis result for SHA-256 d23ffc0bd02b2833…

MALICIOUS

PDF

95.1 KB Created: 2021-07-03 16:57:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: a1466c02db68ecf202a43d6508b19d92 SHA-1: 6dbdae399123e6c9177c74d3578f4f66da085832 SHA-256: d23ffc0bd02b2833a3a7fc5563745e6982809b6ace36604ccbcc9f2c92c10b16
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and multiple URLs pointing to compromised WordPress sites, indicating a phishing or malware distribution attempt. ClamAV detected this file as 'Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0', further supporting its malicious nature. The embedded JavaScript likely facilitates the redirection or download of malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607919081f66a---89804213045.pdf In PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b6b47dc9135---mixabuxuwigajujonifotox.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e84f78f52d---pazakupaji.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608572b27ed48---62681714100.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/3a6fc3eb488a6dc62a70881675027833/75388703240.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160949fca57b6d---bewojebagigakuk.pdfIn PDF document text
    • http://msiutilities.biz/documents/61006821951.pdfIn PDF document text
    • http://ottotech.center/userfiles/file/20441218795.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c639875465e---xixigeridisotomidob.pdfIn PDF document text
    • https://binarbaidrealestate.com/public_html/userfiles/file/1762290352.pdfIn PDF document text
    • http://volvo-cars.jp/js/upload/files/42164834.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/7115ebf21be9efc3da63a81df1913b6d/76073951868.pdfIn PDF document text
    • http://4grd.com/cmsimages/file/tetiga.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/117808260.pdfIn PDF document text
    • http://thedreams.cz/files/52500377181.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606efb722b030---fowogapivasuvado.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607ee14625361---84700936976.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/1efecf0917edc27cc5fb67ab4128ede2/71188286216.pdfIn PDF document text
    • http://ezibra.pl/upload//file/72795368001.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/e303cecd3d2e24a477cfbfad722d44d0/peraderiwezopiwoteka.pdfIn PDF document text
    • http://pn-tech.net/userData/board/file/70293747037.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/b6c2be751fe56b537461f3973cd8c9c5/bojajudajavitonusan.pdfIn PDF document text
    • http://sriagasthiyarastro.com/FCKeditor/userfiles/file/6111124024.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=goodness+of+fit+test+statisticPDF 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_off00010cfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CFB 18400 bytes
SHA-256: e15499fd4c2a17e9ffad6936eeaef11e2551645e5c59c8a901808f01b16f76bf
font_01_sfnt_off00013dde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DDE 10360 bytes
SHA-256: 014d4b018b450a09562882d595979911e753a4b9d03eaea35ef0c80dcd3565b3
font_02_sfnt_off00015578.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15578 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1