Malicious PDF — malware analysis report

Static analysis result for SHA-256 57a5e8b8720a2cc1…

MALICIOUS

PDF

94.3 KB Created: 2021-09-05 07:02:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 3ae2ece069681eb0da8d42b48977acbb SHA-1: 036c1ae65393328baedf765b9645211a7143e4ab SHA-256: 57a5e8b8720a2cc1fb0f9d4e09f3d241c27853a18e9efc124ef2cb3a0ab79b41
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample was detected as malicious by ClamAV and an ML classifier, with heuristics indicating it is a phishing lure and contains embedded JavaScript. The embedded JavaScript likely facilitates the download and execution of a second-stage payload from one of the numerous external URLs, many of which are hosted on compromised CMS upload directories or disposable hosting, suggesting a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

Heuristics 8

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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 http://gold-carsales.com/js/upload/files/81221050389.pdf In PDF document text
    • https://baobihungphu.com/media/ftp/file/37381830440.pdfIn PDF document text
    • https://acrgroup.nl/userfiles/file/56413372136.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160745dbfa10c8---faruravuvemejedewubopexep.pdfIn PDF document text
    • http://ideas4mypool.com/userfiles/file/reliximenovotera.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607af80c249cb---41845660569.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/e01fc9db7074589e015112b5feaefa54/42544730710.pdfIn PDF document text
    • http://enotecagaribaldi.it/userfiles/files/bepipumejanogineterew.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/86860986181.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1611aa22f1856b---27711481596.pdfIn PDF document text
    • http://xyr59.com/filespath/files/20210903081411.pdfIn PDF document text
    • http://olympusflights.com/files/files/59756383433.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607712443c282---zunulodemavazisekenolura.pdfIn PDF document text
    • https://kidneystonetreatment.in/userfiles/files/fozakewazozirojuresepa.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/f4544224dab5f9d698b6fe98ea4ee95b/8244968369.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160a165897a596---31205461396.pdfIn PDF document text
    • https://simplehome.ro/ckfinder/userfiles/files/17209711772.pdfIn PDF document text
    • http://islandpointfl.com/userimages/28127317009.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a96c762df3f---49648896546.pdfIn PDF document text
    • https://gretajensen.com/ckfinder/userfiles/files/12175840884.pdfIn PDF document text
    • http://kiavysocina.cz/UserFiles/File/wikijofajamevebekofotik.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608b2f94e77a4---57375134276.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160872967b2d67---16969342266.pdfIn PDF document text
    • https://samngaimarble.com/html_upload/file/xezaluzowalazebawa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=nanostation+m5+setup+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_off00010a2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A2A 10724 bytes
SHA-256: 4e4181ef4db5a2464deb2a36f238671a20c95a3e8fd49f4347c8566d505cde16
font_01_sfnt_off000122d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122D7 18664 bytes
SHA-256: 56f7d04befd95bd599eeb685157011042fbed5a42b1c88155396595d76ac5a5b
font_02_sfnt_off0001538d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1538D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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