Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1b876d3d8a93878…

MALICIOUS

PDF

88.3 KB Created: 2021-07-23 17:06:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f87f1053f18a96088ad38dff41e74cf1 SHA-1: 5b7f2de4a325523859447f611d2d9056ce88a94c SHA-256: d1b876d3d8a93878005b8ed5e264c06fe43a8afacc1b02f3fc3bb92d6ea0cf88
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF was flagged by multiple heuristics as a link farm and a phishing trojan, with a high ML score and ClamAV detection. The numerous embedded URLs point to compromised CMS uploads and disposable hosting, suggesting an attempt to lure users to malicious content. The file's structure and URL patterns are consistent with phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://peilimineko.com/userfiles/file/40938336783.pdf In PDF document text
    • http://fontanarosaserigrafia.it/userfiles/file/fifukomerunelenotan.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ace65f34464---92739021905.pdfIn PDF document text
    • http://webcertain.net/contentupload/fckeditorUploads/organization_/file/kusezoguxebuxiximisoj.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/2757030690.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab7adb1dd1b---wotam.pdfIn PDF document text
    • http://emilygrilltogo.com/uploads/files/netibifemopipoxa.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609db1d0d3c79---pesar.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607adc350e5be---voxite.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099b734f3e82---81621801962.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/c94c26b7cc73a7212eac4b3cde6ae478/22510302155.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/mlfca42059aiok99d7qr7rkodv/zejavopisabiduru.pdfIn PDF document text
    • http://bettynblue.com/upload/fck_img/20210522/file/27262459779.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c36d131997a---86210404631.pdfIn PDF document text
    • https://agronlogistics.com/userfiles/files/kuwisuvum.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/a2ef96366565ea54968e3c3b8e5455b8/74441302268.pdfIn PDF document text
    • https://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/798e632ebbb556f86c1ac202f8119888/vededine.pdfIn PDF document text
    • http://farashimirooz.com/files/benoxovesuzes.pdfIn PDF document text
    • https://irepairplus.nl/app/webroot/files/userfiles/files/86993678763.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/g2nv8m0ghraqube7dflikhprg2/dixobafab.pdfIn PDF document text
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/35119f12aea89cb9628daa303dde783a/15165101410.pdfIn PDF document text
    • http://centrumbiznesurawicz.pl/userfiles/file/12245672004.pdfIn PDF document text
    • https://semut73.com/contents//files/43024791529.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//91812838278.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/86b10a947454c70365c4e813d1641ae5/robiwuziwelejilelob.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=traffic+rider+mod+apk+iphonePDF 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_off0000f609.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF609 10628 bytes
SHA-256: 0ee5c371eb231976381f49cf449b8fc48e2928ed2346eb0cc69f2de9d42efbdb
font_01_sfnt_off00010e21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E21 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012633.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12633 16904 bytes
SHA-256: e9ef6e515e15012b5ba813809152bdbbf844bf552d63b9036370973303fc1eb4