Malicious PDF — malware analysis report

Static analysis result for SHA-256 04c72bc89d5c3e98…

MALICIOUS

PDF

80.9 KB Created: 2021-09-04 12:20:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 85fa1001c2bac8ffd37a1ce4dbef92b2 SHA-1: 33a5e2565aa29c068d8ec391f7203cf5012810f6 SHA-256: 04c72bc89d5c3e98cbe18a1d38c43484e669d0cbca497fe91c8ea947322d62fb
176 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many of which point to compromised WordPress sites acting as hosting for further malicious content. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicate a pattern of using such sites for distribution. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/v1aocbkt4jg3r6faqit9vvll07/77179086763.pdf In PDF document text
    • http://tsg-edinstvo.ru/userfiles/file/relujolelufilumadenomutu.pdfIn PDF document text
    • http://www.eau-msu.ru/ckfinder/userfiles/files/ziwirurebod.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ffa0e0038d---xodezipusatetexapogamelo.pdfIn PDF document text
    • http://razaviota.ir/basefile/razaviotair/files/7504424940.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/bisiwopanewuvuwelupov.pdfIn PDF document text
    • https://www.nstoplana.rs/ckfinder/userfiles/files/71816199767.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/16090ff086d475---81148454799.pdfIn PDF document text
    • http://aquatherm-graz.at/files/wenewijologova.pdfIn PDF document text
    • http://avvocatoandreabruschi.it/userfiles/files/bisibexitab.pdfIn PDF document text
    • http://orderkai.com/uploads/files/mifove.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/a6f3537a44dbbfa37e270de44db27956/rapilokilunixepalep.pdfIn PDF document text
    • https://samarpanbharat.org/trila/userfiles/file/rarera.pdfIn PDF document text
    • https://ozmutludokum.com/userfiles/file/watufodesexupufolen.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607c432119a88---zatopegibazubas.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085b23550a14---kaxuvuxa.pdfIn PDF document text
    • https://glaze-metalart.com/upload/files/71590834108.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/gajud.pdfIn PDF document text
    • http://yousefmaktabi.com/ckfinder/userfiles/files/6231274249.pdfIn PDF document text
    • http://cassotech.nl/site/data/ws/files/85730165961.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/20216291230352662.pdfIn PDF document text
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/tc41lmpg7t6p6lgb5u3opv5qkf/lomenuja.pdfIn PDF document text
    • http://oticonshop.com/ckfinder/userfiles/files/damuxulixatuditin.pdfIn PDF document text
    • http://longarmquiltacademy.net/fckeditor/userfiles/file/funuki.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=manual+usuario+mazda+5+2006+espa%C3%B1olPDF 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_off0000cbdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBDB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e3ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3ED 20608 bytes
SHA-256: 4fa5b63b15f4d3a3398102de07761189fcba08873fe806f562ec00b1c40b0ee1
font_02_sfnt_off0001191a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1191A 11356 bytes
SHA-256: b5ad0eeba71bb0a649b02fa0a95aec517df8d529a273ccca5c832889fa8455f4

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