Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3c7a63ee0fb0283…

MALICIOUS

PDF

79.4 KB Created: 2021-09-14 03:46:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: de2f3277d49220e69dc1fff8276c0dd6 SHA-1: 7ec465210edfbb37c790c1c38f3b3ccc6eaf9099 SHA-256: f3c7a63ee0fb0283f9cbf04b310f414c8b639fa79776dff242579fb8cdafbfd0
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, indicating a link farm or SEO poisoning attempt. The ML classifier strongly flagged this PDF as malicious. While no scripts were directly extracted, the presence of external links suggests the document's primary purpose is to redirect users to malicious sites, potentially for further exploitation or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://philabc.ru/uplcv?utm_term=right+arm+nerve+pain+treatment PDF link annotation
    • http://milkexim.ru/imgeditor/file/26244188460.pdfIn PDF document text
    • http://hzaidele.com/images/upload/File/77056242890.pdfIn PDF document text
    • https://phu-komplex.pl/pliki/file/69704577513.pdfIn PDF document text
    • http://sacmacbook.net/userfiles/file/38408182534.pdfIn PDF document text
    • https://damsindia.org/admin/uploads/file/37025083786.pdfIn PDF document text
    • https://datenglagi.com/contents/files/43740103767.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161317a0cb7dfa---varawevarazi.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f0583994ac---4350087227.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/92929119927.pdfIn PDF document text
    • https://nileagriculturalindustries.com/file/26105638630.pdfIn PDF document text
    • http://pulsarvn.com/media/ftp/file/nobawonigenajunanadobute.pdfIn PDF document text
    • https://solucionaesp.com/ckfinder/userfiles/files/kuluderuguvezufebelut.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ecef3b03df---50305905380.pdfIn PDF document text
    • http://arc-en-cielproduce.com/ckfinder/userfiles/files/23518757585.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202109/file/bixakazafu.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1612f3e2438996---31052388358.pdfIn PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/8f526820494c975327d722f81461a6bf/52633659300.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1613257e151c43---18102923352.pdfIn PDF document text
    • https://szekszardportal.hu/userfiles/file/39618367017.pdfIn PDF document text
    • http://studiochiodo.eu/userfiles/files/53692591746.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/lo4tc8ld05ecsm4f61ichpnbc4/88403358926.pdfIn PDF document text
    • http://sanchariglobal.com/userfiles/file/80314832669.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/kegezewewoda.pdfIn PDF document text
    • https://samirkumarpaul.com/ckfinder/userfiles/files/muwavesiwan.pdfIn PDF document text
    • https://xistenze.nagydavid.com/files/files/70793425748.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_off0000d64a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD64A 10476 bytes
SHA-256: b898163fb345073e3d597f35f3d35a29ffbae847804b6a27b168ec4c8e09cdbe
font_01_sfnt_off0000ede6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000105f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105F8 16464 bytes
SHA-256: 0eec73a990769a29f100ba0ecaafb6e56d0097136a24c7c645d5332ed857fb0a

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