Malicious PDF — malware analysis report

Static analysis result for SHA-256 acf91e221452d98f…

MALICIOUS

PDF

121.5 KB Created: 2021-07-20 16:58:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f5d2d034e7b7a65a966de4dea39fdb67 SHA-1: b9731119c2fd78e4eb3f9e0a73184109727fb1b5 SHA-256: acf91e221452d98f4e86134099f1d9a61e2958899487de6cfca18bc5fcdbbfca
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous compromised WordPress sites, indicating an attempt to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. The document's structure and numerous external links are characteristic of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 http://annabarons.lv/files/files/gepamawiseda.pdf In PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/d681e87f54b2ab2ae2b64f4a156b4b7e/pujakadikuxepegofufugax.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/hsgfnjcseh03rkvmbh029p83j3/zigetunozufuronutavezuzi.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609a6b15dc626---27032708551.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160c87b06ce880---dugupasabusozit.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/9a5816c464a16171fc09841fd11166ae/51517100018.pdfIn PDF document text
    • https://rosewoodcity.org/nbloom/fckuploads/file/junexalidewalakox.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/epgb0afcuejkj6bof6j6uahm88/98444296453.pdfIn PDF document text
    • http://location-venise.com/italie_documents/files/59149153640.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609054bcca072---15236826928.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/bp91r4dcj1krdf5h4ul9qckol7/43138523118.pdfIn PDF document text
    • https://actor-conseil.com/files/file/moxemalirixesor.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/rri1a58lupdhl9plhft36jlcqf/jixixosoroka.pdfIn PDF document text
    • http://jinistudy.com/_UploadFile/Images/file/nakodiriduvuxawav.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/25851828683.pdfIn PDF document text
    • http://albatrossmrn.com/konadnew/userfiles/file/21333597059.pdfIn PDF document text
    • http://sbkf.org/files/files/fubebogilabukutufubuji.pdfIn PDF document text
    • https://jiu-hang.com/upfiles/editor/files/gurisavetibexotevuganad.pdfIn PDF document text
    • https://hostingalani.com/calisma2/files/uploads/27574304441.pdfIn PDF document text
    • http://www.toeterloeh44.de/files/5754289776.pdfIn PDF document text
    • https://www.ergunaygoren.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607054a438fae---48565175489.pdfIn PDF document text
    • http://knshzj.com/CKEdit/upload/files/68886997016.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=what+month+did+jesus+bornPDF 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_off000172d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x172D1 19760 bytes
SHA-256: a9fe2896c58f49f370fc5030b58ae87f4f15df2637da70cc0c59399f56d44ab8
font_01_sfnt_off0001a663.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A663 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001be7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BE7A 10828 bytes
SHA-256: b33e83dfc00eba973c8340df99c8aece5718c1e1dd624a3514a736c5d0da0863

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