Malicious PDF — malware analysis report

Static analysis result for SHA-256 90bd9d31965ff421…

MALICIOUS

PDF

76.6 KB Created: 2021-09-23 05:59:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 52f2de7de82cfffbeb0dd0014e910edb SHA-1: b674bc99cbdb29cba69c4570e337221386601cee SHA-256: 90bd9d31965ff4213edf4bdb5bdff6b0f1d6088bf23710b2065b1ee1ea0d3687
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many of which point to external websites that appear to be part of a link farm designed to attract search engine traffic. Several of these links lead to compromised WordPress sites or disposable hosting, suggesting an attempt to distribute or host malicious content. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://archism.ru/uplcv?utm_term=windows+movie+maker+2010+download PDF link annotation
    • http://okna-dvere-online.cz/media/upload/upload/file/85377806895.pdfIn PDF document text
    • http://clinicaveterinariacittadivignola.com/userfiles/files/98361922787.pdfIn PDF document text
    • http://taigesw.com/upload/files/xedon.pdfIn PDF document text
    • http://rootbeadmill.com/upload_fck/file/2021-9-3/20210903113015341819.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614960a34ef24---woxosuxukekegis.pdfIn PDF document text
    • https://serwisnawigacji.pl/userfiles/file/regawow.pdfIn PDF document text
    • http://pension-erlkoenig.de/img/editor/file/59293121578.pdfIn PDF document text
    • http://artdental.hu/editor_up/42916612696.pdfIn PDF document text
    • https://eksiliotomotiv.com/upload/ckfinder/files/futadodige.pdfIn PDF document text
    • https://jatransfer.com/userfiles/file/98307279793.pdfIn PDF document text
    • http://adas-muko.pl/photo/file/5423770429.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/2801b2d8b2af956a2b1f7d5dada67e8d/zasawukis.pdfIn PDF document text
    • http://zjnep.com/ckeditor/ckfinder/userfiles/files/refuvub.pdfIn PDF document text
    • http://gowowdeli.com/uploads/files/jesolixufekapizava.pdfIn PDF document text
    • https://035620126.tw/upload/greenkitchen/files/tadofumivasugevogukodar.pdfIn PDF document text
    • http://agavietnam.com/img/files/70291839154.pdfIn PDF document text
    • http://pravkniga.ru/files/userfiles/files/fifemoza.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/u3rogau8ukc0k2nakbdhuiip4h/46136473062.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138400b071b3---38636441526.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/38982398809.pdfIn PDF document text
    • http://pensionpoint.cz/userfiles/files/fawuwomalatix.pdfIn PDF document text
    • http://www.tsahimmongol.com/uploads/images/files/33358805227.pdfIn PDF document text
    • http://konditsionery-zheleznodorozhnyi.ru/upload_picture/file/58741911441.pdfIn PDF document text
    • http://parcroyale.hk/userfiles/22133440460.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_off0000c791.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC791 10840 bytes
SHA-256: ac2776dc9490b20d4e9ca0d1e775bef2f42af2ceba55ccebb487c0a2e548c3d2
font_01_sfnt_off0000e0a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0A8 17116 bytes
SHA-256: a591e1a0a28905421cf1da7d3b5d2a6c0eb08ad5d26c3efb610fcabce5b596c8
font_02_sfnt_off00010ca5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CA5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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