Malicious PDF — malware analysis report

Static analysis result for SHA-256 884c950e8b386fe3…

MALICIOUS

PDF

74.4 KB Created: 2021-09-04 02:36:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ca1be738423994f4a5e4f1a621be9c79 SHA-1: f234a2df94db07cfb9e62245fc8b34fefa18efc1 SHA-256: 884c950e8b386fe33d92b587565c0ccf2483fddf3161b3e445e7d040a8ca57e7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by multiple heuristics as a link farm, with many URLs pointing to compromised WordPress sites and disposable hosting. The ML classifier and ClamAV also strongly indicated maliciousness, specifically identifying it as a phishing trojan. The embedded URLs are the primary indicators of compromise, likely leading to further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/5e71c76b7eed9dab47ffb47c4136d226/mobematewozavu.pdf In PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/rnaurd5rbtpgnbski4bojqnkp3/57384904013.pdfIn PDF document text
    • http://firanywiktoria.pl/uploads/editor/file/86456571236.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/wodamurugabuxanijixi.pdfIn PDF document text
    • http://timebymtm.com/upload/files/xezulir.pdfIn PDF document text
    • http://byty-pardubice.eu/UserFiles/File/sexovuvokenabivuxalaluzu.pdfIn PDF document text
    • http://euro-ex.com/zudilune.pdfIn PDF document text
    • http://duonglaohanoi.com/userfiles/file/lesarogamibewusedewuwun.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/c9bbef12f557c6369de5658586627902/27917193982.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607577e952737---23507793933.pdfIn PDF document text
    • http://congluc.com/upload/files/linugozi.pdfIn PDF document text
    • https://beautyreviveshop.com/newerac2c/userfiles/file/98905356914.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2d64106c3---xanolifo.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/16072840c1dd1b---12312109404.pdfIn PDF document text
    • http://studiolegalezullo.eu/userfiles/files/38568589761.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/5ffa41340b3f0b2b646ca88436b8edb9/81943044480.pdfIn PDF document text
    • https://btcauction.vn/hinhanh/file/nivajafexabepiterakow.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/dbahm91j8no9b1uj1ncote49qf/80935060085.pdfIn PDF document text
    • https://ystechpro.com/nbloom/fckuploads/file/4658070589.pdfIn PDF document text
    • https://rumputhijau.com/contents//files/kaduwajilijofawibemugu.pdfIn PDF document text
    • https://mayurherbal.com/userfiles/file/nanolikenijidezegita.pdfIn PDF document text
    • https://rmp-familienanzeigen.de/cms/files/wajudadonaxu.pdfIn PDF document text
    • http://55pluscommunityspecialist.com/userfiles/files/vowek.pdfIn PDF document text
    • http://lineshare.net/upload/files/20210722031256.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=manual+nissan+micra+2018+espa%C3%B1olPDF 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_off0000ba35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA35 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d24c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD24C 11240 bytes
SHA-256: d836d86c00d047eb1e9b1d8e3c09bbb21c93868acb17dfcb7243ea9a0d76da48
font_02_sfnt_off0000ec5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC5E 18500 bytes
SHA-256: 314d3e054355f8323657464e601e3b42459292b5526bc9eca6d6ac0a691b3993

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