Malicious PDF — malware analysis report

Static analysis result for SHA-256 d772c199b2923325…

MALICIOUS

PDF

74.1 KB Created: 2021-07-20 21:49:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d4251a1553bb6f3522805f6d225575ed SHA-1: 0f409fc1f4aedf9f40eb8ecdf6a0e3159b319a30 SHA-256: d772c199b2923325fe684e42e3cca55dbc1e443ad4c9401409b48ae0954f3da3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also features numerous links to compromised WordPress sites, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or delivering a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://vate-tire.ru/wp-content/plugins/super-forms/uploads/php/files/c706ef1776d63b69025a2917f4953116/vuzasepuguvejasemu.pdf In PDF document text
    • http://com123.vn/uploads/file/56298047622.pdfIn PDF document text
    • http://phs60sand70sdecadesreunion.com/clients/880504/File/22848199590.pdfIn PDF document text
    • http://apcmagon.com/userfiles/bamukaku.pdfIn PDF document text
    • https://jurad.eu/files/file/rovuluwuzogazilarulikomo.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/7i63tatdqg5if2g03coisn99i1/mevifogaruvofid.pdfIn PDF document text
    • http://hzkontejnery.cz/ckfinder/userfiles/files/pixupeteniguminesinoso.pdfIn PDF document text
    • https://www.alphaveneers.com/wp-content/plugins/super-forms/uploads/php/files/02471055eff15183471eca7d523f3b05/46744436459.pdfIn PDF document text
    • https://takeorders.online/wp-content/plugins/super-forms/uploads/php/files/hepgf9vi1g7ld7r2b3qa7e83b7/gagibitikixexadef.pdfIn PDF document text
    • http://smartcevent.com/clients/871459/File/60738045682.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/94eb0693212b422930fe63cfa94870b0/xumaze.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/6e01728c8fd759d3d7cc8cc632f6440b/10227177058.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/fmjlgm2o0q2n1l8dlv5fthddj3/patiraga.pdfIn PDF document text
    • https://roweryelectra.pl/app/webroot/uploads/file/16242651072139.pdfIn PDF document text
    • https://parfumzone.ro/files/file/56222425588.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0ef8616f64---85973093612.pdfIn PDF document text
    • http://n2nnetworks.com/files/others/woner.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c906cb387c1---74302041251.pdfIn PDF document text
    • http://noospc.ru/SITE/files/editor/file/gowovarire.pdfIn PDF document text
    • https://daismene.it/file/kulavefowibu.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d1b4c985fec---27527014124.pdfIn PDF document text
    • http://www.asap-recruitment.net/upload/file/56461579509.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f0d7e39aed---puwuxon.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/8d8a8bef431da919c3e4aa421936d25f/15974379068.pdfIn PDF document text
    • http://www.creativitaecomunicazione.it/js/lib/ckfinder/userfiles/files/27982196167.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=harold%27s+chicken+south+hollandPDF 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_off0000be80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE80 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d692.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD692 17020 bytes
SHA-256: e074e6211efa4dd722f6b3be738cab24a979daf14b3dd15b9a1dc9c7f0a1bccf
font_02_sfnt_off000102d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102D2 10684 bytes
SHA-256: 9c88eaa7f9fd75560a5955ef3b67df312da09c962206da62b571ad639ef49b79