Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c654d2792fed817…

MALICIOUS

PDF

95.7 KB Created: 2021-06-29 15:52:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: b7a1524b59a16d0a234e520d760f1cf2 SHA-1: 02efd194862ad5633d36f30f6a07e6e660647301 SHA-256: 7c654d2792fed8177026a98409b5882730b700cb78554ed889f511ef4e1cd3fd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV detecting it as a phishing trojan. The file contains a link farm pointing to numerous URLs hosted on compromised WordPress sites, suggesting an attempt to distribute malicious content or phish users. The presence of embedded URLs and the nature of the heuristics indicate a likely spearphishing attachment used to redirect victims to malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • 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.
  • 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://spherule.org/wp-content/plugins/super-forms/uploads/php/files/b17cecfe63ec8b86a713b86e02a875fe/kebunokoxeniluribi.pdf In PDF document text
    • http://italiangreyhound.pl/img1/userfiles/file/toxamadipene.pdfIn PDF document text
    • http://ji-tien.com/userfiles/file/14375101436.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/5000447e9de3a80118a01ee7774c7b47/fagowod.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a41c3687f68.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160abe4018e3c9---1180978377.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/d1094fbae613c7149df820ce98c791d1/xedugirotibixikat.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160874639027e1---kipup.pdfIn PDF document text
    • http://elcampoeco.org/FCKeditor/file/7499560327.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f71045201e---buzamofapadimejosoleduse.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d278df00e3---2530417346.pdfIn PDF document text
    • https://serwisnawigacji.pl/userfiles/file/20702337729.pdfIn PDF document text
    • http://uamarkets.com/images/file/kilegakuvovulawod.pdfIn PDF document text
    • http://aitrans.org/UploadFile/file/F1202105181555434295.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/67827a215ff14d65cd0d49ebc122d0a4/42356721128.pdfIn PDF document text
    • http://parkhigh65.com/clients/4970/File/lufizepamimexuvi.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/e0b519756604d72d982b872462ea67c8/48816630779.pdfIn PDF document text
    • http://prime-standard.com/piceditor/file/26546718060.pdfIn PDF document text
    • https://thewaves.net/wp-content/plugins/super-forms/uploads/php/files/1l98blph19bcrqqs10ii3act36/jiniselonisex.pdfIn PDF document text
    • http://vinmexindia.com/uploads/65112838522.pdfIn PDF document text
    • http://skikk.nl/app/webroot/files/userfiles/files/fewivoparoravatob.pdfIn PDF document text
    • http://iccj.jp/images/uploads/fckeditor/file/nanakanemufov.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/90cf479f80c87319ab49017574a9d7d6/tinexuv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=effects+of+pulmonary+embolismPDF 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_off000113f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113F4 10976 bytes
SHA-256: 256a80d440c5227741b283f93bf9f4e01d69c8a5338f54f7e383f1af65ab8022
font_01_sfnt_off00012d3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D3F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014551.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14551 17064 bytes
SHA-256: 7b5b515a051ff099f3d8e615f39a4fb1e2e549c65642775edac5bf3382484b09

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