Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec435b892dcca19d…

MALICIOUS

PDF

85.0 KB Created: 2021-09-01 03:01:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 85593af2e3f706d2ec9eb3bfde965f22 SHA-1: 687543abc24ee460df53309609be75bf8bddbb32 SHA-256: ec435b892dcca19dd999be26de8ec73728bfa2eddb034042b8f503928fe55210
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by multiple heuristics as a link farm, with many URLs pointing to potentially compromised or disposable hosting. The ML classifier and ClamAV also identified it as malicious, specifically a phishing or trojan variant. The embedded URLs suggest an attempt to redirect the user to malicious content, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://smartstone.ca/userfiles/files/16910231476.pdf In PDF document text
    • http://fashioneducation.ru/userfiles/file/25841785197.pdfIn PDF document text
    • http://zatacorp.com/upload/files/fafefibozasudipivogo.pdfIn PDF document text
    • http://marinapogon.pl/upload/file/94982628477.pdfIn PDF document text
    • https://altinhediyeler.com/calisma2/files/uploads/6864134664.pdfIn PDF document text
    • http://www.mezmat.ru/ckfinder/userfiles/files/xupujarupokivawokopila.pdfIn PDF document text
    • http://z500.si/files/rulosax.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/161255b66c241a---xotapadutorupetuvenumunu.pdfIn PDF document text
    • http://quangcaosms.org/media/ftp/file/tawijetufokovi.pdfIn PDF document text
    • https://allmassage.net/upload/file/20210715180138.pdfIn PDF document text
    • https://tcremich.lu/files/files/42730470144.pdfIn PDF document text
    • http://wskinbody.com/data/boardData/files/jiripovakipurowizodazalaj.pdfIn PDF document text
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/ab9c73ad3def291f30fb84fb4bdfcd57/13277365304.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/87f58baiqhf54p2fdlle8hgh8u/pabilinedafodatisabesomiz.pdfIn PDF document text
    • http://axiomestates.com/userfiles/file/28883036492.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/40bad8d078aa470c8a1dfb0e649d43a0/8862662829.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5c2c664eebd6580a27ba15a35b306ffb/95863525040.pdfIn PDF document text
    • http://deauville.ru/files/file/37471545289.pdfIn PDF document text
    • http://lightningriskassessment.com/ci/userfiles/files/10640249619.pdfIn PDF document text
    • https://tourgardan.com/basefile/tourgardancom/files/5403805372.pdfIn PDF document text
    • http://chapelguild.com/images/usr/wuvomig.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609075b50aaec---parifeda.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fb71aeeed43---fewub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=13+reasons+why+ball+dance+songPDF 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_off0000eaa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAA0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000102b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102B7 10928 bytes
SHA-256: 11108318403dadab4030b4e9d1874801fd4387a4f80a12b06f8fc95597a47370
font_02_sfnt_off00011bd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BD2 16548 bytes
SHA-256: c9312778614a010aea987a4c3e3413386d42d4dbb0a9d3b0d0590505d7d3085a

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