Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6d7044c63fac442…

MALICIOUS

PDF

82.3 KB Created: 2021-08-15 01:27:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4d979640203a875388970a853ac132d9 SHA-1: 570962489cae8f7800ad89e3da836b2c303c8a8d SHA-256: b6d7044c63fac442cde04033176014bd1b6a7aac7025978a234696e35094b0f8
156 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a large number of embedded URLs, many pointing to compromised or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. No scripts were extracted, and the document body was unreadable binary data, indicating the malicious functionality is likely embedded within the PDF structure itself or relies on exploiting PDF reader vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://yongqingtech.com/d/files/nitolazux.pdf In PDF document text
    • https://dm288.rs/slicice/file/rilevar.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085fa55b7524---68244044556.pdfIn PDF document text
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/09b7c8aeb3031d02c627a55bc1761147/nofexoxujixaxikebafosozo.pdfIn PDF document text
    • http://lovellreunion.com/clients/4/42/420738e4954c29d3cfd02fdb1bc9139f/File/50712241740.pdfIn PDF document text
    • http://crystalsteakandstogie.com/clients/1/1d/1dbb6d5698303b6304ae84622e226a19/File/pevobiladol.pdfIn PDF document text
    • http://archifolder.com/userfiles/files/rugulogimoxugapofobowa.pdfIn PDF document text
    • http://oinfo.cz/userfiles/file/56173365909.pdfIn PDF document text
    • http://namngonviet.vn/user-/files/tikinuxipusuvesix.pdfIn PDF document text
    • https://francois-daulte.com/ckfinder/userfiles/files/xikidurepulijaf.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/96ec8a5771008130948dc46d34c9d7ac/83982120410.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bca96dc9f83---97598464870.pdfIn PDF document text
    • http://gerocuki.hu/user/file/68885054983.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ba51af7bbfe---roxivazuni.pdfIn PDF document text
    • http://terralis.eu/catalogue_dynamique/file/pejevawavipabomevij.pdfIn PDF document text
    • https://markapin.com/calisma2/files/uploads/misod.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/po1jsmc2rs8pcdmnhaa5tq2274/juzojufuxovodekar.pdfIn PDF document text
    • https://espiber.cl/images/uploadedimages/file/xixerawipovade.pdfIn PDF document text
    • http://tumwebthailand.com/ckfinder/userfiles/files/66043924811.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/4b639443f008fe463174d25ac0a23d82/24935868658.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/362a52f490655e3f0259bfa18996c3ab/46541527800.pdfIn PDF document text
    • https://rubenoferro.com/userfiles/file/16778784314.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/53343b384ac66d37a1c1a61cf822690b/labizejasadebutajudo.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/2860a04bb665dd6b1e61a4cd1f4bd0a0/tamuzodozelesake.pdfIn PDF document text
    • https://bayardplaza.co.uk/wp-content/plugins/super-forms/uploads/php/files/olnilcc2t8so2ssbo6p2bnaprk/25802574402.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+change+voicemail+greeting+on+iphone+xrPDF 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_off0000de38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE38 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f64f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF64F 10896 bytes
SHA-256: 2a80cba432b705c9af029d804c333a26343a0ae9a6f4632a47c411cc241f8fff
font_02_sfnt_off00010f54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F54 16784 bytes
SHA-256: e1ae1b88fa64a9741b4082903647d4154aed7dd50018955d8fa16ce9a1cb0c12

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