Malicious PDF — malware analysis report

Static analysis result for SHA-256 b54db547c170a145…

MALICIOUS

PDF

89.2 KB Created: 2021-07-02 04:53:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ec48863c74a48c737c4af7f29bde5174 SHA-1: b287aecc3e94a30764eb90cf45d7f73fc873563e SHA-256: b54db547c170a145eaa836c697f558923dca9beae513ea0bd913dcbccd03d383
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to compromised CMS uploads and disposable hosting, forming a link farm. These links likely serve to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://ecohort.info/userfiles/files/49371794784.pdf
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f68dd14bd5---51521327493.pdf
    • http://xn--knstlerische-biografie-arbeit-lbd.ch/userfiles/files/simugimoxizez.pdf
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16096981c41e5e---juziwaxotawud.pdf
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092a7f3d6c40---pedebinenefi.pdf
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16075f13fb4fdc---10105234278.pdf
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/9bfdc4f3a23b586512f4018ac5c3b21b/rozikuduwoduwozujomovogir.pdf
    • http://quick-thailand.com/images/uploads/file/liropodawupukalivowutos.pdf
    • http://www.blueoak.fr/image/file/zekuvezijadup.pdf
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/447efb3aab1b8e9703cb15fe7e9fdbbf/1476037976.pdf
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bffdf9a9e9b---52193353202.pdf
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093f9fc98527---68899848294.pdf
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/v1cvmbfp0fjhvj4qklnapnt2nc/wefipevo.pdf
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086cb9532648---43595233160.pdf
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607f3785a1755---vurux.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160824a9275093---73873036097.pdf
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160ae3958738b3---8848520928.pdf
    • http://www.deopendeur.org/imgUser/file/65435819088.pdf
    • http://cdmvt.cz/sites/default/files/pufaja.pdf
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/962cfccfa3f8bec789d3cecb2c077f69/40807693569.pdf
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a304f0930ac---winefilaloxeni.pdf
    • http://mbcasc.net/imgs/file/90895755544.pdf
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cd93a4397d---52589529316.pdf
    • http://greece-ex.com/images/blog//file/17940647167.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=why+does+ice+melt+faster+in+water
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f89d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF89D 16792 bytes
font_01_sfnt_off000110b4.bin
79a50ebbb76d30e0e64c63816559a7b74fa6c57e2f8c24e6e2965e44b489b9dd
pdf-font-stream PDF embedded font (sfnt) at offset 0x110B4 10932 bytes
font_02_sfnt_off000129e7.bin
ac86b350daa80ce0ff2d1041a663327f2bc077f6e169e2adc694c935fdae692e
pdf-font-stream PDF embedded font (sfnt) at offset 0x129E7 17444 bytes