Malicious PDF — malware analysis report

Static analysis result for SHA-256 45a973f303bf7d8e…

MALICIOUS

PDF

84.1 KB Created: 2021-09-19 01:54:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a052dacd3d19d745da56f5a763798872 SHA-1: 86e36de04462163437ec15e8d0ebceaab44ac6e7 SHA-256: 45a973f303bf7d8e45250314424ce03cc2e7679441ab554c24d53dc54aa94b9f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous embedded URLs, many pointing to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of external URIs and the overall structure strongly suggest this PDF is used as a lure to deliver a secondary payload or phish credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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.
  • 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://philabc.ru/uplcv?utm_term=make+my+windows+phone+android PDF link annotation
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1614163c2f22af---nimenuwediritones.pdfIn PDF document text
    • http://drivescuolaguida.it/userfiles/files/zavidapafu.pdfIn PDF document text
    • http://kanizsakran.hu/userfiles/file/kaxeke.pdfIn PDF document text
    • https://happycolaborativo.com/uploads/files/87883360662.pdfIn PDF document text
    • https://yaslibakicisi.net/userfiles/file/fewakogasaxasekanegevare.pdfIn PDF document text
    • https://tannhatviet.vn/upload/files/34480967102.pdfIn PDF document text
    • http://jyy.jp/ckfinder/userfiles/files/20210918_201134.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16146045bda82b---nobapadomijukefebe.pdfIn PDF document text
    • http://wenxuezj.com/images/File/84175799099.pdfIn PDF document text
    • https://delphin-restaurant.com/ckfinder/upload/files/61428167108.pdfIn PDF document text
    • http://dreamsurgerycn.com/ckupload/files/bakomegirebumomilidupik.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c8f012e5cd---6302503206.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161420f2c17e07---91428053065.pdfIn PDF document text
    • http://sksound.com/userfiles/file/wodulejerisudaga.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/kpps7kg8lfmbsli06b5k7l94v3/76139722831.pdfIn PDF document text
    • http://obrienbuilders.com/userfiles/file/sagawotapixuzobivapuge.pdfIn PDF document text
    • https://cjsc.se/ckfinder/userfiles/files/63335450965.pdfIn PDF document text
    • https://bestcaps99.com/ckfinder/userfiles/files/jexuzirozakeg.pdfIn PDF document text
    • http://master-sign.ru/ckfinder/userfiles/files/26966154069.pdfIn PDF document text
    • http://chrisdepanneservices.fr/Sites/cds/files/42310036779.pdfIn PDF document text
    • http://cc-loges.com/uploads/file/83889257739.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/161323237ae3d6---sakosiberogazaxesejefoke.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16131ddf9a95ca---jukefalapibegitisuvili.pdfIn PDF document text
    • http://tcsklife.com/filespath/files/20210905024838.pdfIn PDF document text
    • http://bn-biz.com/userData/board/file/ratiseduvakezasuxotis.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_off0000e29c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE29C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000faae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAAE 18204 bytes
SHA-256: f326f09db58fb1d8fc8f3c75955426d2cf33d904c6a8585f5ff7804671675a11
font_02_sfnt_off00012a51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A51 10796 bytes
SHA-256: d3054e79565998f8845b24c47b1212d6c1b107ea23e88a09758ec296f82800e1

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