Malicious PDF — malware analysis report

Static analysis result for SHA-256 23a8fd708c676026…

MALICIOUS

PDF

97.7 KB Created: 2021-09-13 10:58:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: fc83d382f3ad261bc9c6bb887dde2760 SHA-1: ba31301a7951d74c5ff954c5d08088b69fd0f040 SHA-256: 23a8fd708c676026838f3e295f72f15e92c1d523d7d81f0406d6fc696e3de1af
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing and trojan threat. The document contains a link farm pointing to compromised CMS uploads and disposable hosting, likely intended to trick users into downloading a password-protected archive. The presence of external URIs and a link farm suggests an attempt to deliver a secondary payload, possibly via a social engineering lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://partnermind.cz/images/files/xevufixobazonarofesaba.pdf In PDF document text
    • http://sangsangins.com/upload/upload/file/digukodetikimebob.pdfIn PDF document text
    • http://jcbcharpentebois.com/ressource/site-image/files/26303096520.pdfIn PDF document text
    • https://srilangkapools.com/contents/files/36966351644.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/f32a99220d9354bb34155bcfd31c382d/komakuturu.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1613ec5527aea0---81443689016.pdfIn PDF document text
    • http://thechitay.com/uploads/userfiles/file/kanutalokogumuwewemifada.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/6bad5f566954b1e9ba4e602d8586986f/zojiwelizupon.pdfIn PDF document text
    • https://cheeselicious.net/UserFiles/file/xupiguzevaliw.pdfIn PDF document text
    • http://hennel.hu/sources/elemek/file/32122809615.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613c355b28ea9---mekesemixizelugo.pdfIn PDF document text
    • https://swift-tw.com/lcc/upload/files/rapubesid.pdfIn PDF document text
    • https://clove7.com/userfiles/file/37302337494.pdfIn PDF document text
    • https://minlinart.com/archive/upload/files/92594566126.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/6r4inqm4t1f90hv3vj4f44mgb4/zixonutesugoxesoxod.pdfIn PDF document text
    • http://floral-design-lindgens.de/userfiles/file/batosudejanowe.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/65075753258.pdfIn PDF document text
    • http://vigova.com/Images_upload/files/xajedefaruwivojevefonax.pdfIn PDF document text
    • http://momsystem.ru/public/file/puzepenizer.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fe0ac45a91---74446216899.pdfIn PDF document text
    • http://hyundaihungthinh.com/uploads/images/files/8625833519.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1612edcc92c69c---dezetabutufaxiwi.pdfIn PDF document text
    • http://xedaphcm.com/luutru/files/kawimiriniw.pdfIn PDF document text
    • https://led7.ru/file/9178156250.pdfIn PDF document text
    • http://apple888.vn/luutru/files/23477883196.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=firestick+change+launcherPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000116cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116CC 10560 bytes
SHA-256: a74163260a3e98e7168012c0dbb71c5c2ef82e05644b08195d4a5dbad7039a9f
font_01_sfnt_off00012ed7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ED7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000146e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146E9 19224 bytes
SHA-256: 3ca9a0b047df2f35b0768b53cab73f636dc1901976b6ec84e93b9e98330eebe8

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