Malicious PDF — malware analysis report

Static analysis result for SHA-256 80b587a3c00d621b…

MALICIOUS

PDF

95.6 KB Created: 2021-09-08 06:34:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: df560a7f0063da715d195152e42018aa SHA-1: 58ebf4239f3dbddc85b59388daab3c62181c6407 SHA-256: 80b587a3c00d621be32326135cfd7aa5c4dfd8b16c936605d59795d13cfdce64
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript and a significant number of external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://aldurra.ly/images-editeur/img/file/14733374055.pdf In PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/221e1904824d42e53339e3dbfd6d3fc5/biziv.pdfIn PDF document text
    • http://mos-craciun-inchiriere.ro/fckfiles/file/rewoval.pdfIn PDF document text
    • http://mosjob.ru/images/file/podetuzunogeditup.pdfIn PDF document text
    • https://0900107678.com/upload/file/fuwaluku.pdfIn PDF document text
    • http://tablica-nieruchomosci.pl/uploades/fckeditorfile/panivogerinog.pdfIn PDF document text
    • http://diversecityuk.com/userfiles/file/tupix.pdfIn PDF document text
    • http://eko-uklid.com/files/file/taverokajururoxo.pdfIn PDF document text
    • https://cafeau1ait.xyz/js/ckfinder/userfiles/files/49445955267.pdfIn PDF document text
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db6652b2abe---posupokudukogen.pdfIn PDF document text
    • https://questyme.com/userfiles/file/52135964757.pdfIn PDF document text
    • http://scuderia512.com/js/upload/files/xuvoniwe.pdfIn PDF document text
    • https://www.sesc-am.com.br/Selecao/ckfinder/files/wegotujokulekolibiv.pdfIn PDF document text
    • https://activepymes.com/pub/file/kazudelevepava.pdfIn PDF document text
    • http://dieukhactransam.com/uploads/files/govedalejuvexuvineze.pdfIn PDF document text
    • http://okna-dvere-online.cz/media/upload/upload/file/woregiloligoxufotefe.pdfIn PDF document text
    • http://www.centralperdana.com/file/21955412532.pdfIn PDF document text
    • http://dobraukraina.org/sites/all/sites/dobraukraina.org/files/58365167819.pdfIn PDF document text
    • http://wdnederland.nl/file/pegigizagezuzomironasor.pdfIn PDF document text
    • https://megacook.pt/site/upload/file/97932027056.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160f2130e061e4---54514168109.pdfIn PDF document text
    • https://gastriklandsbf.se/UserFiles/files/fulesu.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/74903febe1be3815c66f4d2ea1885754/18120324895.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/25819386034.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/ae4a2c4e11827099ff7e897b7f6ac27e/mefapegoj.pdfIn PDF document text
    • http://bjzjygj.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/11330193532.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=fm+receiver+project+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_off00011402.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11402 17012 bytes
SHA-256: a49c83152176f01654cb3ee3352c9076f9a713fe8be609714eb68ff6a210e584
font_01_sfnt_off0001408e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1408E 10472 bytes
SHA-256: c60db8e8c10663710dbabbd20fd7869d13794c5e3968ca3b6c3f464e8076b3ba
font_02_sfnt_off00015849.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15849 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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