Malicious PDF — malware analysis report

Static analysis result for SHA-256 ace1e3ad48fd6e6d…

MALICIOUS

PDF

86.2 KB Created: 2021-09-06 21:22:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 2e6c12768c0955a9bbbd4abdf500a5b2 SHA-1: 841fd49dc1d516c09f40c9eb43b7507dc6a8b082 SHA-256: ace1e3ad48fd6e6dfec05789be36ddef4cd07a41af3e0688acf7ced88e2780bf
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://dintainoodle.com/uploads/files/tenosunaga.pdf In PDF document text
    • http://saxonrt.hu/img/userfiles/files/43830206527.pdfIn PDF document text
    • https://edinburghpools.com/contents//files/kawatusidabuvoza.pdfIn PDF document text
    • https://avonsteel.com/UserFiles/file/33333881360.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160860d966a9e6---88213711027.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/23ed1pf9t11es7eifjs045bbc3/teburipaxofuduliwovog.pdfIn PDF document text
    • http://irinka.org/ckfinder/userfiles/files/45882337898.pdfIn PDF document text
    • https://silatur.com/js/ckfinder/userfiles/files/purodilagufijefawabu.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/160f649b42c82d---72271129439.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/90bf0d244947e080054febddd4147863/52971505498.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160aad17f5a6d1---29071939988.pdfIn PDF document text
    • http://bygreenpure.com/userfiles/file/41054918029.pdfIn PDF document text
    • http://axiomestates.com/userfiles/file/70672862842.pdfIn PDF document text
    • https://penzion-pod-rozhlednou.cz/img/file/4341129859.pdfIn PDF document text
    • http://fletcherfamilyreunion.org/clients/52745/File/sakixadugatetofoxawaz.pdfIn PDF document text
    • https://djennebeads.com/nbloom/fckuploads/file/50969900007.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/6ef7bfc8473cd0d55f27dfcdf5d75d02/kobokepanetosoliwulegod.pdfIn PDF document text
    • http://khiensa.com/UserFiles/File/38068845942.pdfIn PDF document text
    • https://abriganature.centralcms.cloud/galeria/files/54581425800.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/b8134db361ceda467229f0b934390a68/5313646089.pdfIn PDF document text
    • http://gadkowski.pl/repository/filemanager/file/fewomamesunozisovilo.pdfIn PDF document text
    • https://oncallanatomist.org/ckfinder/userfiles/files/17875631463.pdfIn PDF document text
    • http://outspokenholland.com/userfiles/fckFile/20210606074311.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=definition+of+rural+development+by+world+bank+pdfPDF 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_off0000e92c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE92C 11088 bytes
SHA-256: 54a1fd975f5d74d442dd408775aa29ace00a0b8c8590a529f8f2a7951d769c13
font_01_sfnt_off000102d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102D4 18456 bytes
SHA-256: 693fee3b4249615b0aa02b8d5e4ae538b0281aafabcfb45fcc56060fd482c3e3
font_02_sfnt_off000132da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1