Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4de275c89f37851…

MALICIOUS

PDF

83.5 KB Created: 2021-09-19 22:24:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d1624aa1a10135026da2dfddfe2df8f7 SHA-1: 340640b7a576154c82b3d3ee4a452a0585ebb51b SHA-256: e4de275c89f37851f32b8e72a8056ad47dba9433d94cc3695a5f8e24badc10e3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as a malicious PDF by ML classifiers and ClamAV. It functions as a link farm, directing users to multiple external websites, some of which are hosted on compromised WordPress installations or disposable domains. The embedded URLs suggest a phishing or credential harvesting attempt, potentially leading to further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 6

  • 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.
  • 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://irlanc.ru/uplcv?utm_term=how+do+you+do+a+hard+reset+on+your+phone PDF link annotation
    • http://speckletrack.com/update/editor/file/puvivizubolubajoz.pdfIn PDF document text
    • http://vaness-sens.fr/ckfinder/userfiles/files/delisogu.pdfIn PDF document text
    • http://razaviota.ir/basefile/razaviotair/files/20256303210.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/226aa118eef6145d8db7bf8180facd69/gikonakorununalaj.pdfIn PDF document text
    • http://thegioimaychaybo.com/app/webroot/uploads/files/zulijujajejivu.pdfIn PDF document text
    • http://x-mobio.com/upload/files/gixax.pdfIn PDF document text
    • http://purofirstli.com/userfiles/files/fumimovutov.pdfIn PDF document text
    • https://solelane.com/ckfinder/userfiles/files/39285400464.pdfIn PDF document text
    • http://kusistoconstruction.com/userfiles/file/vaxefede.pdfIn PDF document text
    • https://kermoulin.com/userfiles/file/18214583978.pdfIn PDF document text
    • http://dentherapia.hu/files/file/19667150169.pdfIn PDF document text
    • https://exihomes.com/userfiles/files/gopokajoredevedoxu.pdfIn PDF document text
    • http://jshanwoo.com/ckfinder/userfiles/files/86283755851.pdfIn PDF document text
    • https://landatur.com/files/galeria/files/68075814200.pdfIn PDF document text
    • http://jia-longsofa.com/uploadpic/jialong151126/files/202109151652564377.pdfIn PDF document text
    • http://thephinhmienbac.com/upload/files/74055346424.pdfIn PDF document text
    • http://zlhk.ru/upload_picture/file/84106819273.pdfIn PDF document text
    • http://captainkillmite.com/uploads/files/202109060617005940.pdfIn PDF document text
    • http://villabrown.it/userfiles/files/2741322075.pdfIn PDF document text
    • https://woft-dining.com/webroot/editor-uploads/files/52559111658.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613abb5b42e16---98241281233.pdfIn PDF document text
    • http://turskazka.ru/ckfinder/userfiles/files/46844993321.pdfIn PDF document text
    • https://nls.vn/upload/files/kedukujalubafave.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/ibocdicjq21qrnfeaugecsn67c/kemikali.pdfIn PDF document text
    • http://land89.com/ckupload/files/pikabake.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613618b02a1e8---dibofonus.pdfIn PDF document text
    • http://drumlockingclamp.com/FCK_Editor_Images/files/92889808684.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_off0000e242.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE242 10644 bytes
SHA-256: da0ce26fb8a3d23c6b64f95b94cc285894175faa66c45bb9d56df096c9a26430
font_01_sfnt_off0000faa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAA0 17748 bytes
SHA-256: 75d3b5f560f5612cbbfacffa26c13f8eb9bcfa1ebb6421008d6e4abb2fc9c313
font_02_sfnt_off00012822.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12822 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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