Malicious PDF — malware analysis report

Static analysis result for SHA-256 76c65c828b1a2db6…

MALICIOUS

PDF

84.9 KB Created: 2021-09-02 04:46:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0c35b20f3f1bc29153aacaff94df7e5c SHA-1: fd6c057be000ba2ab57e94c57d46061d06b45fe4 SHA-256: 76c65c828b1a2db6902834a6d00b05ae13900982a1f0bab5c3c7c1dcf5ef57fe
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript, which is a common technique for executing malicious code. It also features a large number of external links, many pointing to compromised WordPress sites, suggesting a phishing or content-luring campaign. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/057e5c6392e3bee8cd0c46e6e4dc8cbc/52230178847.pdf In PDF document text
    • http://kraemer-duennebacke.de/files/file/jogalafilefijulum.pdfIn PDF document text
    • https://adsbudget.net/userfiles/file/funofiluf.pdfIn PDF document text
    • http://champaigncursillo.com/userfiles/file/47897814863.pdfIn PDF document text
    • http://maximaviajes.com/FCKfiles/file/40306909434.pdfIn PDF document text
    • https://stratasphere.online/userfiles/file/32264456364.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/16110be5e2ade1---popasajebotetobazuliwira.pdfIn PDF document text
    • http://garagehayashi.com/js/upload/files/bizipujovuvutitutef.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/1611382f0f1cc9---xugijotif.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609c4ffdb094b---lokukutadodogedula.pdfIn PDF document text
    • https://sjamsul-hidajat.id/ck_uploads/uploads/files/97309888139.pdfIn PDF document text
    • https://bititechnika.com/uploads/file/ruselubu.pdfIn PDF document text
    • http://crocepadrekolbe.it/userfiles/files/juwewivemux.pdfIn PDF document text
    • http://fvv-hohenfelde.de/sites/default/files/files/xavututitemofuv.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/16095b95aa3ca1---47134527789.pdfIn PDF document text
    • http://ubest.ru/images/file/pevuxoxodamojij.pdfIn PDF document text
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094495d20c0a---45038549374.pdfIn PDF document text
    • http://tz5168.com/uploadfile/image/2021/05/19/file/20210519_132735_102.pdfIn PDF document text
    • http://rollfactorytogo.com/uploads/files/lodegodijemaxapoj.pdfIn PDF document text
    • http://xn--h1aaebbkfib4a.xn--p1ai/sadm_files/22481778790.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/160d9b5e3c135c---fejurupiwe.pdfIn PDF document text
    • http://choinka4x4.org/cms/files/file/fesimego.pdfIn PDF document text
    • http://jiehuist.com/userfiles/files/47614090686.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=music+assignments+pdfPDF 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_off0000e62f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE62F 18232 bytes
SHA-256: df617008688e62bc28605cbd0640b7a32bf19bdf2d145c1a1dd81e374f20a74e
font_01_sfnt_off00011560.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11560 10792 bytes
SHA-256: 33aca320fac924b7be192796178cf3646fc7c943bd8654f06144b139d85bd9e8
font_02_sfnt_off00012e0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E0F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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