Malicious PDF — malware analysis report

Static analysis result for SHA-256 28b8181f0e727b73…

MALICIOUS

PDF

81.5 KB Created: 2021-09-08 08:52:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9a8d075473c621cf88c5d5092fa53933 SHA-1: dce6ebce7f6517cd0428b2d44545ff1857fcbd70 SHA-256: 28b8181f0e727b73256cebc920869a283d0aa2e0102526f08b3041e6c427ce12
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a link farm pointing to multiple PDF files hosted on compromised websites, suggesting an attempt to obscure the final malicious destination. The presence of external URIs and link farms indicates a multi-stage attack, likely involving redirection to a phishing page or a malware download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/c057c1fe7436d77ad38b32e166d18a07/47029586702.pdf In PDF document text
    • https://prolocolidodisavio.org/ckfinder/userfiles/files/59487418907.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1609211d7c48ce---71595157047.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/1721fb1e7a9a28a73a16f1205613288e/jumoso.pdfIn PDF document text
    • https://drivetripper.com/userfiles2020/files/segujagovodikawutiz.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609de4d3caa86---18020481810.pdfIn PDF document text
    • http://dotacjedlaoze.pl/userfiles/file/79591356032.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609630dd68ec0---44520909003.pdfIn PDF document text
    • http://kojeneckezbozi.eu/userfiles/file/53031188039.pdfIn PDF document text
    • http://getampedmag.com/ckfinder/userfiles/files/92769699297.pdfIn PDF document text
    • http://app8itebarandgrill.com/admin/images/file/14923166880.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160846b2abdd1d---gezabonukajivosiso.pdfIn PDF document text
    • http://studiopignotti.it/userfiles/files/50453563609.pdfIn PDF document text
    • http://kastely-vacduka.hu/fileok/file/92757500755.pdfIn PDF document text
    • http://teaandtiarasottawa.org/clients/e/e8/e8f54e69a7463df9fd0adff13cd8e90f/File/zinopi.pdfIn PDF document text
    • https://baptistfriends.org/media/dirowivusipev.pdfIn PDF document text
    • http://tl-maskinfabrik.dk/userfiles/file/17812587999.pdfIn PDF document text
    • http://csa.china-led.net/static/editor/ckeditor/ckfinder/upfile/files/kefazunalosiponikefogizax.pdfIn PDF document text
    • http://crackershrimp.com/file_media/file_image/file/42256114248.pdfIn PDF document text
    • https://zlato-eu.cz/upload/files/41658505390.pdfIn PDF document text
    • http://deborahkay.com/ckfinder/userfiles/files/99565289843.pdfIn PDF document text
    • http://stonebreaker.at/86307608882.pdfIn PDF document text
    • http://capitaldanceacademy.com/userfiles/files/safukeka.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=sketching+pencils+guide+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_off0000dc0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC0F 10784 bytes
SHA-256: 577318f5e84523cac11415c397ed9e9011fc47483e20014fe250df9e952feea7
font_01_sfnt_off0000f49b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF49B 17148 bytes
SHA-256: 0284b2b46de3d4b6d60dcb0958fa5e98e22bb3b8e8868def6fd39bca58daaf36
font_02_sfnt_off0001207f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1207F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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