Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d13ea89a0462277…

MALICIOUS

PDF

89.8 KB Created: 2021-10-04 13:02:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 8b9e523a8e667e659602cc0bf840b05d SHA-1: 91eac2997163cf7aeef7a8d739294e66fd4bbbc6 SHA-256: 3d13ea89a0462277ae63a627794e7298edaeaf44f2e988428b28a3c896d8be70
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The file also features a link farm pointing to multiple external URLs, some hosted on compromised CMS upload directories, suggesting an attempt to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://ketchas.ru/uplcv?utm_term=wizard+of+oz+1985 PDF link annotation
    • http://newo.ru/files/files/64562102701.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/80b806ec60197c736be73bccae4762e8/43554794898.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/bcf77852fdccc0cbe35ab7e895fcfec4/27572761190.pdfIn PDF document text
    • http://nasfthr.com/userfiles/file/zokuviwipotufigewaxepuna.pdfIn PDF document text
    • http://kanizsakran.hu/userfiles/file/45490675930.pdfIn PDF document text
    • http://pdww.ru/ckfinder/userfiles/files/49488142832.pdfIn PDF document text
    • https://impeka.lt/components/com_mijoshop/opencart/image/data/files/8207339748.pdfIn PDF document text
    • https://e-tta.com/app/webroot/userfiles/files/71738235176.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16146841af2553---nolubibebamafurebazoso.pdfIn PDF document text
    • http://partner-support.net/user_data/userfiles/files/xuwuzakimisiporuri.pdfIn PDF document text
    • https://indiachristian.org/uploads/files/gumizavusitera.pdfIn PDF document text
    • http://oryginalnedekoracje.pl/userfiles/file/7430852197.pdfIn PDF document text
    • http://gdlejia.com/uploadfile/files/20210903_075224.pdfIn PDF document text
    • http://linuxnewyork.com/draft/media/xejuvepolo.pdfIn PDF document text
    • http://gk-eventus.ru/admin/ckfinder/userfiles/files/peloboso.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613c462fb5c0e---89477892361.pdfIn PDF document text
    • http://ediljolli.com/userfiles/files/wogadipe.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/85edd2b256c6b45b9934ab38719c684d/6009168008.pdfIn PDF document text
    • http://premo.at/userfiles/file/71520193129.pdfIn PDF document text
    • http://mtcongnghiepxanh.com/upload/fckimagesfile/31428523415.pdfIn PDF document text
    • https://aznamaste.com/ckfinder/userfiles/files/wugumezegaxemez.pdfIn PDF document text
    • https://moraure.net/js/ckfinder/userfiles/files/83083657073.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ddb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDB2 10416 bytes
SHA-256: 02202417e41b5a6a14992cf4faf4c93318e2d90ab3665d8d20ad3a41ccba6fff
font_01_sfnt_off0000f580.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF580 18140 bytes
SHA-256: cd6678eb7f8a1b8d739ba3fa46d0158191e9903f432025e3834b64b234b226d6
font_02_sfnt_off0001245d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1245D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00013c6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C6E 18356 bytes
SHA-256: 0a957c4f6960c73242be9b22434b94281017078797f97cfcd6760b07354bf275

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